---
_id: '14010'
abstract:
- lang: eng
text: We report measurements of energy-dependent attosecond photoionization delays
between the two outer-most valence shells of N2O and H2O. The combination of single-shot
signal referencing with the use of different metal foils to filter the attosecond
pulse train enables us to extract delays from congested spectra. Remarkably large
delays up to 160 as are observed in N2O, whereas the delays in H2O are all smaller
than 50 as in the photon-energy range of 20-40 eV. These results are interpreted
by developing a theory of molecular photoionization delays. The long delays measured
in N2O are shown to reflect the population of molecular shape resonances that
trap the photoelectron for a duration of up to ∼110 as. The unstructured continua
of H2O result in much smaller delays at the same photon energies. Our experimental
and theoretical methods make the study of molecular attosecond photoionization
dynamics accessible.
article_number: '093001'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Martin
full_name: Huppert, Martin
last_name: Huppert
- first_name: Inga
full_name: Jordan, Inga
last_name: Jordan
- first_name: Denitsa Rangelova
full_name: Baykusheva, Denitsa Rangelova
id: 71b4d059-2a03-11ee-914d-dfa3beed6530
last_name: Baykusheva
- first_name: Aaron
full_name: von Conta, Aaron
last_name: von Conta
- first_name: Hans Jakob
full_name: Wörner, Hans Jakob
last_name: Wörner
citation:
ama: Huppert M, Jordan I, Baykusheva DR, von Conta A, Wörner HJ. Attosecond delays
in molecular photoionization. Physical Review Letters. 2016;117(9). doi:10.1103/physrevlett.117.093001
apa: Huppert, M., Jordan, I., Baykusheva, D. R., von Conta, A., & Wörner, H.
J. (2016). Attosecond delays in molecular photoionization. Physical Review
Letters. American Physical Society. https://doi.org/10.1103/physrevlett.117.093001
chicago: Huppert, Martin, Inga Jordan, Denitsa Rangelova Baykusheva, Aaron von Conta,
and Hans Jakob Wörner. “Attosecond Delays in Molecular Photoionization.” Physical
Review Letters. American Physical Society, 2016. https://doi.org/10.1103/physrevlett.117.093001.
ieee: M. Huppert, I. Jordan, D. R. Baykusheva, A. von Conta, and H. J. Wörner, “Attosecond
delays in molecular photoionization,” Physical Review Letters, vol. 117,
no. 9. American Physical Society, 2016.
ista: Huppert M, Jordan I, Baykusheva DR, von Conta A, Wörner HJ. 2016. Attosecond
delays in molecular photoionization. Physical Review Letters. 117(9), 093001.
mla: Huppert, Martin, et al. “Attosecond Delays in Molecular Photoionization.” Physical
Review Letters, vol. 117, no. 9, 093001, American Physical Society, 2016,
doi:10.1103/physrevlett.117.093001.
short: M. Huppert, I. Jordan, D.R. Baykusheva, A. von Conta, H.J. Wörner, Physical
Review Letters 117 (2016).
date_created: 2023-08-10T06:37:07Z
date_published: 2016-08-26T00:00:00Z
date_updated: 2023-08-22T08:42:50Z
day: '26'
doi: 10.1103/physrevlett.117.093001
extern: '1'
external_id:
arxiv:
- '1607.07435'
pmid:
- '27610849'
intvolume: ' 117'
issue: '9'
keyword:
- General Physics and Astronomy
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1607.07435
month: '08'
oa: 1
oa_version: Preprint
pmid: 1
publication: Physical Review Letters
publication_identifier:
eissn:
- 1079-7114
issn:
- 0031-9007
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Attosecond delays in molecular photoionization
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 117
year: '2016'
...
---
_id: '14011'
abstract:
- lang: eng
text: We introduce bicircular high-harmonic spectroscopy as a new method to probe
dynamical symmetries of atoms and molecules and their evolution in time. Our approach
is based on combining a circularly polarized femtosecond fundamental field of
frequency ω with its counterrotating second harmonic 2ω. We demonstrate the ability
of bicircular high-harmonic spectroscopy to characterize the orbital angular momentum
symmetry of atomic orbitals. We further show that breaking the threefold rotational
symmetry of the generating medium-at the level of either the ensemble or that
of a single molecule-results in the emission of the otherwise parity-forbidden
frequencies 3qω (q∈N), which provide a background-free probe of dynamical molecular
symmetries.
article_number: '123001'
article_processing_charge: No
article_type: original
author:
- first_name: Denitsa Rangelova
full_name: Baykusheva, Denitsa Rangelova
id: 71b4d059-2a03-11ee-914d-dfa3beed6530
last_name: Baykusheva
- first_name: Md Sabbir
full_name: Ahsan, Md Sabbir
last_name: Ahsan
- first_name: 'Nan'
full_name: Lin, Nan
last_name: Lin
- first_name: Hans Jakob
full_name: Wörner, Hans Jakob
last_name: Wörner
citation:
ama: Baykusheva DR, Ahsan MS, Lin N, Wörner HJ. Bicircular high-harmonic spectroscopy
reveals dynamical symmetries of atoms and molecules. Physical Review Letters.
2016;116(12). doi:10.1103/physrevlett.116.123001
apa: Baykusheva, D. R., Ahsan, M. S., Lin, N., & Wörner, H. J. (2016). Bicircular
high-harmonic spectroscopy reveals dynamical symmetries of atoms and molecules.
Physical Review Letters. American Physical Society. https://doi.org/10.1103/physrevlett.116.123001
chicago: Baykusheva, Denitsa Rangelova, Md Sabbir Ahsan, Nan Lin, and Hans Jakob
Wörner. “Bicircular High-Harmonic Spectroscopy Reveals Dynamical Symmetries of
Atoms and Molecules.” Physical Review Letters. American Physical Society,
2016. https://doi.org/10.1103/physrevlett.116.123001.
ieee: D. R. Baykusheva, M. S. Ahsan, N. Lin, and H. J. Wörner, “Bicircular high-harmonic
spectroscopy reveals dynamical symmetries of atoms and molecules,” Physical
Review Letters, vol. 116, no. 12. American Physical Society, 2016.
ista: Baykusheva DR, Ahsan MS, Lin N, Wörner HJ. 2016. Bicircular high-harmonic
spectroscopy reveals dynamical symmetries of atoms and molecules. Physical Review
Letters. 116(12), 123001.
mla: Baykusheva, Denitsa Rangelova, et al. “Bicircular High-Harmonic Spectroscopy
Reveals Dynamical Symmetries of Atoms and Molecules.” Physical Review Letters,
vol. 116, no. 12, 123001, American Physical Society, 2016, doi:10.1103/physrevlett.116.123001.
short: D.R. Baykusheva, M.S. Ahsan, N. Lin, H.J. Wörner, Physical Review Letters
116 (2016).
date_created: 2023-08-10T06:37:16Z
date_published: 2016-03-25T00:00:00Z
date_updated: 2023-08-22T08:44:10Z
day: '25'
doi: 10.1103/physrevlett.116.123001
extern: '1'
external_id:
pmid:
- '27058077'
intvolume: ' 116'
issue: '12'
keyword:
- General Physics and Astronomy
language:
- iso: eng
month: '03'
oa_version: None
pmid: 1
publication: Physical Review Letters
publication_identifier:
eissn:
- 1079-7114
issn:
- 0031-9007
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Bicircular high-harmonic spectroscopy reveals dynamical symmetries of atoms
and molecules
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 116
year: '2016'
...
---
_id: '10376'
abstract:
- lang: eng
text: Nucleation processes are at the heart of a large number of phenomena, from
cloud formation to protein crystallization. A recently emerging area where nucleation
is highly relevant is the initiation of filamentous protein self-assembly, a process
that has broad implications in many research areas ranging from medicine to nanotechnology.
As such, spontaneous nucleation of protein fibrils has received much attention
in recent years with many theoretical and experimental studies focusing on the
underlying physical principles. In this paper we make a step forward in this direction
and explore the early time behaviour of filamentous protein growth in the context
of nucleation theory. We first provide an overview of the thermodynamics and kinetics
of spontaneous nucleation of protein filaments in the presence of one relevant
degree of freedom, namely the cluster size. In this case, we review how key kinetic
observables, such as the reaction order of spontaneous nucleation, are directly
related to the physical size of the critical nucleus. We then focus on the increasingly
prominent case of filament nucleation that includes a conformational conversion
of the nucleating building-block as an additional slow step in the nucleation
process. Using computer simulations, we study the concentration dependence of
the nucleation rate. We find that, under these circumstances, the reaction order
of spontaneous nucleation with respect to the free monomer does no longer relate
to the overall physical size of the nucleating aggregate but rather to the portion
of the aggregate that actively participates in the conformational conversion.
Our results thus provide a novel interpretation of the common kinetic descriptors
of protein filament formation, including the reaction order of the nucleation
step or the scaling exponent of lag times, and put into perspective current theoretical
descriptions of protein aggregation.
acknowledgement: We acknowledge support from the Human Frontier Science Program and
Emmanuel College (A.Š.), St John’s and Peterhouse Colleges (T.C.T.M.), the Swiss
National Science Foundation (T.C.T.M.), the Biotechnology and Biological Sciences
Research Council (T.P.J.K.), the Frances and Augustus Newman Foundation (T.P.J.K.),
the European Research Council (T.C.T.M., T.P.J.K., and D.F.), and the Engineering
and Physical Sciences Research Council (D.F.).
article_number: '211926'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Anđela
full_name: Šarić, Anđela
id: bf63d406-f056-11eb-b41d-f263a6566d8b
last_name: Šarić
orcid: 0000-0002-7854-2139
- first_name: Thomas C. T.
full_name: Michaels, Thomas C. T.
last_name: Michaels
- first_name: Alessio
full_name: Zaccone, Alessio
last_name: Zaccone
- first_name: Tuomas P. J.
full_name: Knowles, Tuomas P. J.
last_name: Knowles
- first_name: Daan
full_name: Frenkel, Daan
last_name: Frenkel
citation:
ama: 'Šarić A, Michaels TCT, Zaccone A, Knowles TPJ, Frenkel D. Kinetics of spontaneous
filament nucleation via oligomers: Insights from theory and simulation. The
Journal of Chemical Physics. 2016;145(21). doi:10.1063/1.4965040'
apa: 'Šarić, A., Michaels, T. C. T., Zaccone, A., Knowles, T. P. J., & Frenkel,
D. (2016). Kinetics of spontaneous filament nucleation via oligomers: Insights
from theory and simulation. The Journal of Chemical Physics. American Institute
of Physics. https://doi.org/10.1063/1.4965040'
chicago: 'Šarić, Anđela, Thomas C. T. Michaels, Alessio Zaccone, Tuomas P. J. Knowles,
and Daan Frenkel. “Kinetics of Spontaneous Filament Nucleation via Oligomers:
Insights from Theory and Simulation.” The Journal of Chemical Physics.
American Institute of Physics, 2016. https://doi.org/10.1063/1.4965040.'
ieee: 'A. Šarić, T. C. T. Michaels, A. Zaccone, T. P. J. Knowles, and D. Frenkel,
“Kinetics of spontaneous filament nucleation via oligomers: Insights from theory
and simulation,” The Journal of Chemical Physics, vol. 145, no. 21. American
Institute of Physics, 2016.'
ista: 'Šarić A, Michaels TCT, Zaccone A, Knowles TPJ, Frenkel D. 2016. Kinetics
of spontaneous filament nucleation via oligomers: Insights from theory and simulation.
The Journal of Chemical Physics. 145(21), 211926.'
mla: 'Šarić, Anđela, et al. “Kinetics of Spontaneous Filament Nucleation via Oligomers:
Insights from Theory and Simulation.” The Journal of Chemical Physics,
vol. 145, no. 21, 211926, American Institute of Physics, 2016, doi:10.1063/1.4965040.'
short: A. Šarić, T.C.T. Michaels, A. Zaccone, T.P.J. Knowles, D. Frenkel, The Journal
of Chemical Physics 145 (2016).
date_created: 2021-11-29T10:01:57Z
date_published: 2016-12-01T00:00:00Z
date_updated: 2021-11-29T10:33:11Z
day: '01'
doi: 10.1063/1.4965040
extern: '1'
external_id:
arxiv:
- '1610.02320'
pmid:
- '28799382'
intvolume: ' 145'
issue: '21'
keyword:
- physical and theoretical chemistry
- general physics and astronomy
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1610.02320
month: '12'
oa: 1
oa_version: Preprint
pmid: 1
publication: The Journal of Chemical Physics
publication_identifier:
eissn:
- 1089-7690
issn:
- 0021-9606
publication_status: published
publisher: American Institute of Physics
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Kinetics of spontaneous filament nucleation via oligomers: Insights from theory
and simulation'
type: journal_article
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
volume: 145
year: '2016'
...
---
_id: '10378'
abstract:
- lang: eng
text: The ability of biological molecules to replicate themselves is the foundation
of life, requiring a complex cellular machinery. However, a range of aberrant
processes involve the self-replication of pathological protein structures without
any additional assistance. One example is the autocatalytic generation of pathological
protein aggregates, including amyloid fibrils, involved in neurodegenerative disorders.
Here, we use computer simulations to identify the necessary requirements for the
self-replication of fibrillar assemblies of proteins. We establish that a key
physical determinant for this process is the affinity of proteins for the surfaces
of fibrils. We find that self-replication can take place only in a very narrow
regime of inter-protein interactions, implying a high level of sensitivity to
system parameters and experimental conditions. We then compare our theoretical
predictions with kinetic and biosensor measurements of fibrils formed from the
Aβ peptide associated with Alzheimer’s disease. Our results show a quantitative
connection between the kinetics of self-replication and the surface coverage of
fibrils by monomeric proteins. These findings reveal the fundamental physical
requirements for the formation of supra-molecular structures able to replicate
themselves, and shed light on mechanisms in play in the proliferation of protein
aggregates in nature.
acknowledgement: We acknowledge support from the Human Frontier Science Program and
Emmanuel College (A.Š.), the Leverhulme Trust and Magdalene College (A.K.B.), St
John’s College (T.C.T.M.), the Biotechnology and Biological Sciences Research Council
(T.P.J.K. and C.M.D.), the Frances and Augustus Newman Foundation (T.P.J.K.), the
European Research Council (T.P.J.K., T.C.T.M., S.L. and D.F.), and the Engineering
and Physical Sciences Research Council (D.F.).
article_processing_charge: No
article_type: original
author:
- first_name: Anđela
full_name: Šarić, Anđela
id: bf63d406-f056-11eb-b41d-f263a6566d8b
last_name: Šarić
orcid: 0000-0002-7854-2139
- first_name: Alexander K.
full_name: Buell, Alexander K.
last_name: Buell
- first_name: Georg
full_name: Meisl, Georg
last_name: Meisl
- first_name: Thomas C. T.
full_name: Michaels, Thomas C. T.
last_name: Michaels
- first_name: Christopher M.
full_name: Dobson, Christopher M.
last_name: Dobson
- first_name: Sara
full_name: Linse, Sara
last_name: Linse
- first_name: Tuomas P. J.
full_name: Knowles, Tuomas P. J.
last_name: Knowles
- first_name: Daan
full_name: Frenkel, Daan
last_name: Frenkel
citation:
ama: Šarić A, Buell AK, Meisl G, et al. Physical determinants of the self-replication
of protein fibrils. Nature Physics. 2016;12(9):874-880. doi:10.1038/nphys3828
apa: Šarić, A., Buell, A. K., Meisl, G., Michaels, T. C. T., Dobson, C. M., Linse,
S., … Frenkel, D. (2016). Physical determinants of the self-replication of protein
fibrils. Nature Physics. Springer Nature. https://doi.org/10.1038/nphys3828
chicago: Šarić, Anđela, Alexander K. Buell, Georg Meisl, Thomas C. T. Michaels,
Christopher M. Dobson, Sara Linse, Tuomas P. J. Knowles, and Daan Frenkel. “Physical
Determinants of the Self-Replication of Protein Fibrils.” Nature Physics.
Springer Nature, 2016. https://doi.org/10.1038/nphys3828.
ieee: A. Šarić et al., “Physical determinants of the self-replication of
protein fibrils,” Nature Physics, vol. 12, no. 9. Springer Nature, pp.
874–880, 2016.
ista: Šarić A, Buell AK, Meisl G, Michaels TCT, Dobson CM, Linse S, Knowles TPJ,
Frenkel D. 2016. Physical determinants of the self-replication of protein fibrils.
Nature Physics. 12(9), 874–880.
mla: Šarić, Anđela, et al. “Physical Determinants of the Self-Replication of Protein
Fibrils.” Nature Physics, vol. 12, no. 9, Springer Nature, 2016, pp. 874–80,
doi:10.1038/nphys3828.
short: A. Šarić, A.K. Buell, G. Meisl, T.C.T. Michaels, C.M. Dobson, S. Linse, T.P.J.
Knowles, D. Frenkel, Nature Physics 12 (2016) 874–880.
date_created: 2021-11-29T10:36:11Z
date_published: 2016-07-18T00:00:00Z
date_updated: 2021-11-29T11:07:25Z
day: '18'
doi: 10.1038/nphys3828
extern: '1'
external_id:
pmid:
- '31031819'
intvolume: ' 12'
issue: '9'
keyword:
- general physics and astronomy
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://discovery.ucl.ac.uk/id/eprint/1517406/
month: '07'
oa: 1
oa_version: Preprint
page: 874-880
pmid: 1
publication: Nature Physics
publication_identifier:
eissn:
- 1745-2481
issn:
- 1745-2473
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Physical determinants of the self-replication of protein fibrils
type: journal_article
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
volume: 12
year: '2016'
...
---
_id: '10380'
abstract:
- lang: eng
text: Using non-equilibrium molecular dynamics simulations, it has been recently
demonstrated that water molecules align in response to an imposed temperature
gradient, resulting in an effective electric field. Here, we investigate how thermally
induced fields depend on the underlying treatment of long-ranged interactions.
For the short-ranged Wolf method and Ewald summation, we find the peak strength
of the field to range between 2 × 107 and 5 × 107 V/m for a temperature gradient
of 5.2 K/Å. Our value for the Wolf method is therefore an order of magnitude lower
than the literature value [J. A. Armstrong and F. Bresme, J. Chem. Phys. 139,
014504 (2013); J. Armstrong et al., J. Chem. Phys. 143, 036101 (2015)]. We show
that this discrepancy can be traced back to the use of an incorrect kernel in
the calculation of the electrostatic field. More seriously, we find that the Wolf
method fails to predict correct molecular orientations, resulting in dipole densities
with opposite sign to those computed using Ewald summation. By considering two
different multipole expansions, we show that, for inhomogeneous polarisations,
the quadrupole contribution can be significant and even outweigh the dipole contribution
to the field. Finally, we propose a more accurate way of calculating the electrostatic
potential and the field. In particular, we show that averaging the microscopic
field analytically to obtain the macroscopic Maxwell field reduces the error bars
by up to an order of magnitude. As a consequence, the simulation times required
to reach a given statistical accuracy decrease by up to two orders of magnitude.
acknowledgement: The authors should like to dedicate this paper to the memory of Simon
de Leeuw, who was a pioneer in the calculation of Coulomb effects in simulations.
P.W. would like to thank the Austrian Academy of Sciences for financial support
through a DOC Fellowship, and for covering the travel expenses for the CECAM workshop
in Zaragoza in May 2015, where these results were first presented. P.W. would also
like to thank Chao Zhang for pointing out the equivalence of the two expressions
for the electric field discussed in Sec. VI D, Michiel Sprik for emphasising the
importance of the quadrupole contribution in experimental studies of interfacial
systems, as well as Aleks Reinhardt and other members of the Frenkel and Dellago
groups for their advice. We further acknowledge support from the Federation of Austrian
Industry (IV) Carinthia (P.W.), the University of Zagreb and Erasmus SMP (D. Fijan),
the Human Frontier Science Program and Emmanuel College (A.Š.), the Austrian Science
Fund FWF within the SFB Vicom project F41 (C.D.), and the Engineering and Physical
Sciences Research Council Programme Grant No. EP/I001352/1 (D.F.). Additional data
related to this publication are available at the University of Cambridge data repository
(http://dx.doi.org/10.17863/CAM.118).
article_number: '224102'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: P.
full_name: Wirnsberger, P.
last_name: Wirnsberger
- first_name: D.
full_name: Fijan, D.
last_name: Fijan
- first_name: Anđela
full_name: Šarić, Anđela
id: bf63d406-f056-11eb-b41d-f263a6566d8b
last_name: Šarić
orcid: 0000-0002-7854-2139
- first_name: M.
full_name: Neumann, M.
last_name: Neumann
- first_name: C.
full_name: Dellago, C.
last_name: Dellago
- first_name: D.
full_name: Frenkel, D.
last_name: Frenkel
citation:
ama: Wirnsberger P, Fijan D, Šarić A, Neumann M, Dellago C, Frenkel D. Non-equilibrium
simulations of thermally induced electric fields in water. The Journal of Chemical
Physics. 2016;144(22). doi:10.1063/1.4953036
apa: Wirnsberger, P., Fijan, D., Šarić, A., Neumann, M., Dellago, C., & Frenkel,
D. (2016). Non-equilibrium simulations of thermally induced electric fields in
water. The Journal of Chemical Physics. American Institute of Physics.
https://doi.org/10.1063/1.4953036
chicago: Wirnsberger, P., D. Fijan, Anđela Šarić, M. Neumann, C. Dellago, and D.
Frenkel. “Non-Equilibrium Simulations of Thermally Induced Electric Fields in
Water.” The Journal of Chemical Physics. American Institute of Physics,
2016. https://doi.org/10.1063/1.4953036.
ieee: P. Wirnsberger, D. Fijan, A. Šarić, M. Neumann, C. Dellago, and D. Frenkel,
“Non-equilibrium simulations of thermally induced electric fields in water,” The
Journal of Chemical Physics, vol. 144, no. 22. American Institute of Physics,
2016.
ista: Wirnsberger P, Fijan D, Šarić A, Neumann M, Dellago C, Frenkel D. 2016. Non-equilibrium
simulations of thermally induced electric fields in water. The Journal of Chemical
Physics. 144(22), 224102.
mla: Wirnsberger, P., et al. “Non-Equilibrium Simulations of Thermally Induced Electric
Fields in Water.” The Journal of Chemical Physics, vol. 144, no. 22, 224102,
American Institute of Physics, 2016, doi:10.1063/1.4953036.
short: P. Wirnsberger, D. Fijan, A. Šarić, M. Neumann, C. Dellago, D. Frenkel, The
Journal of Chemical Physics 144 (2016).
date_created: 2021-11-29T11:08:52Z
date_published: 2016-06-10T00:00:00Z
date_updated: 2021-11-29T13:09:08Z
day: '10'
doi: 10.1063/1.4953036
extern: '1'
external_id:
arxiv:
- '1602.02734'
pmid:
- '27305991'
intvolume: ' 144'
issue: '22'
keyword:
- physical and theoretical chemistry
- general physics and astronomy
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1602.02734
month: '06'
oa: 1
oa_version: Preprint
pmid: 1
publication: The Journal of Chemical Physics
publication_identifier:
eissn:
- 1089-7690
issn:
- 0021-9606
publication_status: published
publisher: American Institute of Physics
quality_controlled: '1'
scopus_import: '1'
status: public
title: Non-equilibrium simulations of thermally induced electric fields in water
type: journal_article
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
volume: 144
year: '2016'
...
---
_id: '11519'
abstract:
- lang: eng
text: 'Faint Lyα emitters become increasingly rarer toward the reionization epoch
(z ∼ 6–7). However, observations from a very large (∼5 deg2) Lyα narrow-band survey
at z = 6.6 show that this is not the case for the most luminous emitters, capable
of ionizing their own local bubbles. Here we present follow-up observations of
the two most luminous Lyα candidates in the COSMOS field: “MASOSA” and “CR7.”
We used X-SHOOTER, SINFONI, and FORS2 on the Very Large Telescope, and DEIMOS
on Keck, to confirm both candidates beyond any doubt. We find redshifts of z =
6.541 and z = 6.604 for “MASOSA” and “CR7,” respectively. MASOSA has a strong
detection in Lyα with a line width of 386 ± 30 km s−1 (FWHM) and with very high
EW0 (>200 Å), but undetected in the continuum, implying very low stellar mass
and a likely young, metal-poor stellar population. “CR7,” with an observed Lyα
luminosity of 1043.92±0.05 erg s−1 is the most luminous Lyα emitter ever found
at z > 6 and is spatially extended (∼16 kpc). “CR7” reveals a narrow Lyα line
with 266 ± 15 km s−1 FWHM, being detected in the near-infrared (NIR) (rest-frame
UV; β = −2.3 ± 0.1) and in IRAC/Spitzer. We detect a narrow He II 1640 Å emission
line (6σ, FWHM = 130 ± 30 km s−1 ) in CR7 which can explain the clear excess seen
in the J-band photometry (EW0 ∼ 80 Å). We find no other emission lines from the
UV to the NIR in our X-SHOOTER spectra (He II/O III] 1663 Å > 3 and He II/C III]
1908 Å > 2.5). We conclude that CR7 is best explained by a combination of a PopIII-like
population, which dominates the rest-frame UV and the nebular emission, and a
more normal stellar population, which presumably dominates the mass. Hubble Space
Telescope/WFC3 observations show that the light is indeed spatially separated
between a very blue component, coincident with Lyα and He II emission, and two
red components (∼5 kpc away), which dominate the mass. Our findings are consistent
with theoretical predictions of a PopIII wave, with PopIII star formation migrating
away from the original sites of star formation.'
acknowledgement: We thank the anonymous reviewer for useful and constructive comments
and suggestions which greatly improved the quality and clarity of our work. D.S.
acknowledges financial support from the Netherlands Organisation for Scientific
research (NWO) through a Veni fellowship, from FCT through a FCT Investigator Starting
Grant and Start-up Grant (IF/01154/2012/CP0189/CT0010), from FCT grant UID/FIS/04434/2013,
and from LSF and LKBF. J.M. acknowledges the award of a Huygens PhD fellowship.
H.R. acknowledges support from the ERC Advanced Investigator program NewClusters
321271. The authors thank Mark Dijkstra, Bhaskar Agarwal, Jarrett Johnson, Andrea
Ferrara, Jarle Brinchmann, Rebecca Bowler, George Becker, Emma Curtis-Lake, Milos
Milosavljevic, Raffaella Schneider, Paul Shapiro, and Erik Zackrisson for interesting,
stimulating and helpful discussions. The authors are extremely grateful to ESO for
the award of ESO DDT time (294.A-5018 and 294.A-5039) which allowed the spectroscopic
confirmation of both sources and the detailed investigation of their nature. Observations
are also based on data from W.M. Keck Observatory. The W.M. Keck Observatory is
operated as a scientific partnership of Caltech, the University of California and
the National Aeronautics and Space Administration. Based on observations obtained
with MegaPrime/Megacam, a joint project of CFHT and CEA/IRFU, at the Canada–France–Hawaii
Telescope (CFHT) which is operated by the National Research Council (NRC) of Canada,
the Institut National des Science de lUnivers of the Centre National de la Recherche
Scientifique (CNRS) of France, and the University of Hawaii. This work is based
in part on data products produced at Terapix available at the Canadian Astronomy
Data Centre as part of the Canada–France–Hawaii Telescope Legacy Survey, a collaborative
project of NRC and CNRS. Based on data products from observations made with ESO
Telescopes at the La Silla Paranal Observatory under ESO programme IDs 294.A-5018,
294.A-5039, and 179.A-2005, and on data products produced by TERAPIX and the Cambridge
Astronomy Survey Unit on behalf of the UltraVISTA consortium. The authors acknowledge
the award of service time (SW2014b20) on the William Herschel Telescope (WHT). WHT
and its service programme are operated on the island of La Palma by the Isaac Newton
Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de
Astrofisica de Canarias.
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: David
full_name: Sobral, David
last_name: Sobral
- first_name: Jorryt J
full_name: Matthee, Jorryt J
id: 7439a258-f3c0-11ec-9501-9df22fe06720
last_name: Matthee
orcid: 0000-0003-2871-127X
- first_name: Behnam
full_name: Darvish, Behnam
last_name: Darvish
- first_name: Daniel
full_name: Schaerer, Daniel
last_name: Schaerer
- first_name: Bahram
full_name: Mobasher, Bahram
last_name: Mobasher
- first_name: Huub
full_name: Röttgering, Huub
last_name: Röttgering
- first_name: Sérgio
full_name: Santos, Sérgio
last_name: Santos
- first_name: Shoubaneh
full_name: Hemmati, Shoubaneh
last_name: Hemmati
citation:
ama: 'Sobral D, Matthee JJ, Darvish B, et al. Evidence for PopIII-like stellar populations
in the most luminous Lyα emitters at the epoch of reionisation: Spectroscopic
confirmation. The Astrophysical Journal. 2015;808(2):139. doi:10.1088/0004-637X/808/2/139'
apa: 'Sobral, D., Matthee, J. J., Darvish, B., Schaerer, D., Mobasher, B., Röttgering,
H., … Hemmati, S. (2015). Evidence for PopIII-like stellar populations in the
most luminous Lyα emitters at the epoch of reionisation: Spectroscopic confirmation.
The Astrophysical Journal. IOP Publishing. https://doi.org/10.1088/0004-637X/808/2/139'
chicago: 'Sobral, David, Jorryt J Matthee, Behnam Darvish, Daniel Schaerer, Bahram
Mobasher, Huub Röttgering, Sérgio Santos, and Shoubaneh Hemmati. “Evidence for
PopIII-like Stellar Populations in the Most Luminous Lyα Emitters at the Epoch
of Reionisation: Spectroscopic Confirmation.” The Astrophysical Journal.
IOP Publishing, 2015. https://doi.org/10.1088/0004-637X/808/2/139.'
ieee: 'D. Sobral et al., “Evidence for PopIII-like stellar populations in
the most luminous Lyα emitters at the epoch of reionisation: Spectroscopic confirmation,”
The Astrophysical Journal, vol. 808, no. 2. IOP Publishing, p. 139, 2015.'
ista: 'Sobral D, Matthee JJ, Darvish B, Schaerer D, Mobasher B, Röttgering H, Santos
S, Hemmati S. 2015. Evidence for PopIII-like stellar populations in the most luminous
Lyα emitters at the epoch of reionisation: Spectroscopic confirmation. The Astrophysical
Journal. 808(2), 139.'
mla: 'Sobral, David, et al. “Evidence for PopIII-like Stellar Populations in the
Most Luminous Lyα Emitters at the Epoch of Reionisation: Spectroscopic Confirmation.”
The Astrophysical Journal, vol. 808, no. 2, IOP Publishing, 2015, p. 139,
doi:10.1088/0004-637X/808/2/139.'
short: D. Sobral, J.J. Matthee, B. Darvish, D. Schaerer, B. Mobasher, H. Röttgering,
S. Santos, S. Hemmati, The Astrophysical Journal 808 (2015) 139.
date_created: 2022-07-07T09:00:58Z
date_published: 2015-07-28T00:00:00Z
date_updated: 2022-08-18T10:30:13Z
day: '28'
doi: 10.1088/0004-637X/808/2/139
extern: '1'
external_id:
arxiv:
- '1504.01734'
intvolume: ' 808'
issue: '2'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
- dark ages
- reionization
- 'first stars – early universe – galaxies: evolution'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1504.01734
month: '07'
oa: 1
oa_version: Preprint
page: '139'
publication: The Astrophysical Journal
publication_identifier:
eissn:
- 1538-4357
issn:
- 0004-637X
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Evidence for PopIII-like stellar populations in the most luminous Lyα emitters
at the epoch of reionisation: Spectroscopic confirmation'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 808
year: '2015'
...
---
_id: '11579'
abstract:
- lang: eng
text: CR7 is the brightest z = 6.6 Ly α emitter (LAE) known to date, and spectroscopic
follow-up by Sobral et al. suggests that CR7 might host Population (Pop) III stars.
We examine this interpretation using cosmological hydrodynamical simulations.
Several simulated galaxies show the same ‘Pop III wave’ pattern observed in CR7.
However, to reproduce the extreme CR7 Ly α/He II1640 line luminosities (Lα/HeII)
a top-heavy initial mass function and a massive ( ≳ 107 M⊙) Pop III burst with
age ≲ 2 Myr are required. Assuming that the observed properties of Ly α and He II
emission are typical for Pop III, we predict that in the COSMOS/UDS/SA22 fields,
14 out of the 30 LAEs at z = 6.6 with Lα > 1043.3 erg s−1 should also host Pop
III stars producing an observable LHeII≳1042.7ergs−1. As an alternate explanation,
we explore the possibility that CR7 is instead powered by accretion on to a direct
collapse black hole. Our model predicts Lα, LHeII, and X-ray luminosities that
are in agreement with the observations. In any case, the observed properties of
CR7 indicate that this galaxy is most likely powered by sources formed from pristine
gas. We propose that further X-ray observations can distinguish between the two
above scenarios.
acknowledgement: SS acknowledges support from the Netherlands Organization for Scientific
research (NWO), VENI grant 639.041.233. RS acknowledges support from the European
Research Council under the European Union (FP/2007-2013)/ERC grant agreement no.
306476. DS acknowledges (i) financial support from the NWO through a Veni fellowship
and (ii) funding from FCT through a FCT Investigator Starting Grant and Start-up
Grant (IF/01154/2012/CP0189/CT0010) and from FCT grant PEstOE/FIS/UI2751/2014.
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: A.
full_name: Pallottini, A.
last_name: Pallottini
- first_name: A.
full_name: Ferrara, A.
last_name: Ferrara
- first_name: F.
full_name: Pacucci, F.
last_name: Pacucci
- first_name: S.
full_name: Gallerani, S.
last_name: Gallerani
- first_name: S.
full_name: Salvadori, S.
last_name: Salvadori
- first_name: R.
full_name: Schneider, R.
last_name: Schneider
- first_name: D.
full_name: Schaerer, D.
last_name: Schaerer
- first_name: D.
full_name: Sobral, D.
last_name: Sobral
- first_name: Jorryt J
full_name: Matthee, Jorryt J
id: 7439a258-f3c0-11ec-9501-9df22fe06720
last_name: Matthee
orcid: 0000-0003-2871-127X
citation:
ama: 'Pallottini A, Ferrara A, Pacucci F, et al. The brightest Lyα emitter: Pop
III or black hole? Monthly Notices of the Royal Astronomical Society. 2015;453(3):2465-2470.
doi:10.1093/mnras/stv1795'
apa: 'Pallottini, A., Ferrara, A., Pacucci, F., Gallerani, S., Salvadori, S., Schneider,
R., … Matthee, J. J. (2015). The brightest Lyα emitter: Pop III or black hole?
Monthly Notices of the Royal Astronomical Society. Oxford University Press.
https://doi.org/10.1093/mnras/stv1795'
chicago: 'Pallottini, A., A. Ferrara, F. Pacucci, S. Gallerani, S. Salvadori, R.
Schneider, D. Schaerer, D. Sobral, and Jorryt J Matthee. “The Brightest Lyα Emitter:
Pop III or Black Hole?” Monthly Notices of the Royal Astronomical Society.
Oxford University Press, 2015. https://doi.org/10.1093/mnras/stv1795.'
ieee: 'A. Pallottini et al., “The brightest Lyα emitter: Pop III or black
hole?,” Monthly Notices of the Royal Astronomical Society, vol. 453, no.
3. Oxford University Press, pp. 2465–2470, 2015.'
ista: 'Pallottini A, Ferrara A, Pacucci F, Gallerani S, Salvadori S, Schneider R,
Schaerer D, Sobral D, Matthee JJ. 2015. The brightest Lyα emitter: Pop III or
black hole? Monthly Notices of the Royal Astronomical Society. 453(3), 2465–2470.'
mla: 'Pallottini, A., et al. “The Brightest Lyα Emitter: Pop III or Black Hole?”
Monthly Notices of the Royal Astronomical Society, vol. 453, no. 3, Oxford
University Press, 2015, pp. 2465–70, doi:10.1093/mnras/stv1795.'
short: A. Pallottini, A. Ferrara, F. Pacucci, S. Gallerani, S. Salvadori, R. Schneider,
D. Schaerer, D. Sobral, J.J. Matthee, Monthly Notices of the Royal Astronomical
Society 453 (2015) 2465–2470.
date_created: 2022-07-14T08:58:36Z
date_published: 2015-11-01T00:00:00Z
date_updated: 2022-08-19T08:19:23Z
day: '01'
doi: 10.1093/mnras/stv1795
extern: '1'
external_id:
arxiv:
- '1506.07173'
intvolume: ' 453'
issue: '3'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
- black hole physics
- 'stars: Population III'
- 'galaxies: high-redshift'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1506.07173
month: '11'
oa: 1
oa_version: Preprint
page: 2465-2470
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
eissn:
- 1365-2966
issn:
- 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'The brightest Lyα emitter: Pop III or black hole?'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 453
year: '2015'
...
---
_id: '11580'
abstract:
- lang: eng
text: 'We present results from the largest contiguous narrow-band survey in the
near-infrared. We have used the wide-field infrared camera/Canada–France–Hawaii
Telescope and the lowOH2 filter (1.187 ± 0.005 μm) to survey ≈10 deg2 of contiguous
extragalactic sky in the SA22 field. A total of ∼6000 candidate emission-line
galaxies are found. We use deep ugrizJK data to obtain robust photometric redshifts.
We combine our data with the High-redshift(Z) Emission Line Survey (HiZELS), explore
spectroscopic surveys (VVDS, VIPERS) and obtain our own spectroscopic follow-up
with KMOS, FMOS and MOSFIRE to derive large samples of high-redshift emission-line
selected galaxies: 3471 Hα emitters at z = 0.8, 1343 [O III] + Hβ emitters at
z = 1.4 and 572 [O II] emitters at z = 2.2. We probe comoving volumes of >106
Mpc3 and find significant overdensities, including an 8.5σ (spectroscopically
confirmed) overdensity of Hα emitters at z = 0.81. We derive Hα, [O III] + Hβ
and [O II] luminosity functions at z = 0.8, 1.4, 2.2, respectively, and present
implications for future surveys such as Euclid. Our uniquely large volumes/areas
allow us to subdivide the samples in thousands of randomized combinations of areas
and provide a robust empirical measurement of sample/cosmic variance. We show
that surveys for star-forming/emission-line galaxies at a depth similar to ours
can only overcome cosmic-variance (errors <10 per cent) if they are based on volumes
>5 × 105 Mpc3; errors on L* and ϕ* due to sample (cosmic) variance on surveys
probing ∼104 and ∼105 Mpc3 are typically very high: ∼300 and ∼40–60 per cent,
respectively.'
acknowledgement: The authors wish to thank the anonymous reviewer for many helpful
comments and suggestions which greatly improved the clarity and quality of this
work. DS acknowledges financial support from the Netherlands Organization for Scientific
research (NWO) through a Veni fellowship, from FCT through an FCT Investigator Starting
Grant and Start-up Grant (IF/01154/2012/CP0189/CT0010), from FCT grant PEst-OE/FIS/UI2751/2014,
and from LSF and LKBF. JM acknowledges the award of a Huygens PhD fellowship. PNB
is grateful for support from STFC. IRS acknowledges support from STFC, a Leverhulme
Fellowship, the ERC Advanced Investigator programme DUSTYGAL and a Royal Society/Wolfson
Merit Award. BMJ acknowledges support from the ERC-StG grant EGGS-278202. The Dark
Cosmology Centre is funded by the DNRF. The Dark Cosmology Centre is funded by the
DNRF. JWK acknowledges support from the National Research Foundation of Korea (NRF)
grant, no. 2008-0060544, funded by the Korea government (MSIP). JPS acknowledges
support from STFC (ST/I001573/1). JC acknowledges support from the FCT-IF grant
IF/01154/2012/CP0189/CT0010. The work was only possible due to OPTICON/FP7 and the
invaluable access that it granted to the CFHT telescope. We would also like to acknowledge
the excellent work done by CFHT staff in conducting the observations in service
mode, and on delivering truly excellent data. We are also tremendously thankful
to Kentaro Aoki for the incredible support while observing at Subaru with FMOS,
and also to the Keck staff for the help with the observations with MOSFIRE. This
work is based on observations obtained with WIRCam on the CFHT, OPTICON programme
2011B/029, 2012A019 and 2012B/016. Based on observations made with ESO telescopes
at the La Silla Paranal Observatory under programmes IDs 60.A-9460 (data can be
accessed through the ESO data archive), 087.A 0337 and 089.A-0965. Based on observations
done with FMOS on Subaru under programme S14A-084, and on MOSFIRE/Keck observations
under programme U066M. Part of the data on which this analysis is based are available
from Sobral et al. (2013a). Dedicated to the memory of C. M. Sobral (1953-2014).
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: D.
full_name: Sobral, D.
last_name: Sobral
- first_name: Jorryt J
full_name: Matthee, Jorryt J
id: 7439a258-f3c0-11ec-9501-9df22fe06720
last_name: Matthee
orcid: 0000-0003-2871-127X
- first_name: P. N.
full_name: Best, P. N.
last_name: Best
- first_name: I.
full_name: Smail, I.
last_name: Smail
- first_name: A. A.
full_name: Khostovan, A. A.
last_name: Khostovan
- first_name: B.
full_name: Milvang-Jensen, B.
last_name: Milvang-Jensen
- first_name: J.-W.
full_name: Kim, J.-W.
last_name: Kim
- first_name: J.
full_name: Stott, J.
last_name: Stott
- first_name: J.
full_name: Calhau, J.
last_name: Calhau
- first_name: H.
full_name: Nayyeri, H.
last_name: Nayyeri
- first_name: B.
full_name: Mobasher, B.
last_name: Mobasher
citation:
ama: 'Sobral D, Matthee JJ, Best PN, et al. CF-HiZELS, an ∼10 deg2 emission-line
survey with spectroscopic follow-up: Hα, [O III] + Hβ and [O II] luminosity functions
at z = 0.8, 1.4 and 2.2 . Monthly Notices of the Royal Astronomical Society.
2015;451(3):2303-2323. doi:10.1093/mnras/stv1076'
apa: 'Sobral, D., Matthee, J. J., Best, P. N., Smail, I., Khostovan, A. A., Milvang-Jensen,
B., … Mobasher, B. (2015). CF-HiZELS, an ∼10 deg2 emission-line survey with spectroscopic
follow-up: Hα, [O III] + Hβ and [O II] luminosity functions at z = 0.8, 1.4 and
2.2 . Monthly Notices of the Royal Astronomical Society. Oxford University
Press. https://doi.org/10.1093/mnras/stv1076'
chicago: 'Sobral, D., Jorryt J Matthee, P. N. Best, I. Smail, A. A. Khostovan, B.
Milvang-Jensen, J.-W. Kim, et al. “CF-HiZELS, an ∼10 Deg2 Emission-Line Survey
with Spectroscopic Follow-up: Hα, [O III] + Hβ and [O II] Luminosity Functions
at z = 0.8, 1.4 and 2.2 .” Monthly Notices of the Royal Astronomical Society.
Oxford University Press, 2015. https://doi.org/10.1093/mnras/stv1076.'
ieee: 'D. Sobral et al., “CF-HiZELS, an ∼10 deg2 emission-line survey with
spectroscopic follow-up: Hα, [O III] + Hβ and [O II] luminosity functions at z
= 0.8, 1.4 and 2.2 ,” Monthly Notices of the Royal Astronomical Society,
vol. 451, no. 3. Oxford University Press, pp. 2303–2323, 2015.'
ista: 'Sobral D, Matthee JJ, Best PN, Smail I, Khostovan AA, Milvang-Jensen B, Kim
J-W, Stott J, Calhau J, Nayyeri H, Mobasher B. 2015. CF-HiZELS, an ∼10 deg2 emission-line
survey with spectroscopic follow-up: Hα, [O III] + Hβ and [O II] luminosity functions
at z = 0.8, 1.4 and 2.2 . Monthly Notices of the Royal Astronomical Society. 451(3),
2303–2323.'
mla: 'Sobral, D., et al. “CF-HiZELS, an ∼10 Deg2 Emission-Line Survey with Spectroscopic
Follow-up: Hα, [O III] + Hβ and [O II] Luminosity Functions at z = 0.8, 1.4 and
2.2 .” Monthly Notices of the Royal Astronomical Society, vol. 451, no.
3, Oxford University Press, 2015, pp. 2303–23, doi:10.1093/mnras/stv1076.'
short: D. Sobral, J.J. Matthee, P.N. Best, I. Smail, A.A. Khostovan, B. Milvang-Jensen,
J.-W. Kim, J. Stott, J. Calhau, H. Nayyeri, B. Mobasher, Monthly Notices of the
Royal Astronomical Society 451 (2015) 2303–2323.
date_created: 2022-07-14T09:02:22Z
date_published: 2015-08-11T00:00:00Z
date_updated: 2022-08-19T08:23:18Z
day: '11'
doi: 10.1093/mnras/stv1076
extern: '1'
external_id:
arxiv:
- '1502.06602'
intvolume: ' 451'
issue: '3'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
- 'galaxies: evolution'
- 'galaxies: formation'
- 'galaxies: luminosity function'
- mass function
- 'cosmology: observations'
- early Universe
- large-scale structure of Universe
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1502.06602
month: '08'
oa: 1
oa_version: Preprint
page: 2303-2323
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
eissn:
- 1365-2966
issn:
- 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'CF-HiZELS, an ∼10 deg2 emission-line survey with spectroscopic follow-up:
Hα, [O III] + Hβ and [O II] luminosity functions at z = 0.8, 1.4 and 2.2 '
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 451
year: '2015'
...
---
_id: '11581'
abstract:
- lang: eng
text: Using wide-field narrow-band surveys, we provide a new measurement of the
z = 6.6 Lymanα emitter (LAE) luminosity function (LF), which constraints the bright
end for the first time. We use a combination of archival narrow-band NB921 data
in UDS and new NB921 measurements in SA22 and COSMOS/UltraVISTA, all observed
with the Subaru telescope, with a total area of ∼5 deg2. We exclude lower redshift
interlopers by using broad-band optical and near-infrared photometry and also
exclude three supernovae with data split over multiple epochs. Combining the UDS
and COSMOS samples, we find no evolution of the bright end of the Lyα LF between
z = 5.7 and 6.6, which is supported by spectroscopic follow-up, and conclude that
sources with Himiko-like luminosity are not as rare as previously thought, with
number densities of ∼1.5 × 10−5 Mpc−3. Combined with our wide-field SA22 measurements,
our results indicate a non-Schechter-like bright end of the LF at z = 6.6 and
a different evolution of observed faint and bright LAEs, overcoming cosmic variance.
This differential evolution is also seen in the spectroscopic follow-up of UV-selected
galaxies and is now also confirmed for LAEs, and we argue that it may be an effect
of reionization. Using a toy model, we show that such differential evolution of
the LF is expected, since brighter sources are able to ionize their surroundings
earlier, such that Lyα photons are able to escape. Our targets are excellent candidates
for detailed follow-up studies and provide the possibility to give a unique view
on the earliest stages in the formation of galaxies and reionization process.
acknowledgement: "We thank the anonymous referee for the comments and suggestions
which have improved the quality of this work. We thank Masami Ouchi for his useful
comments on an earlier version of this paper. JM acknowledges the support of a Huygens
PhD fellowship from Leiden University and is thankful for the hospitality of the
Center for Astronomy and Astrophysics of the University of Lisbon where part of
this research has been done. DS acknowledges financial support from the Netherlands
Organization for Scientific research (NWO) through a Veni fellowship, from FCT through
a FCT Investigator Starting Grant and Start-up Grant (IF/01154/2012/CP0189/CT0010)
and from FCT grant PEstOE/FIS/UI2751/2014. HR acknowledges support from the ERC
Advanced Investigator programme NewClusters 321271. We acknowledge the award of
ESO DDT time (294.A-5018) for providing the possibility of a timely publication
of this work.\r\nBased on observations with the Subaru Telescope (Programme IDs:
our observations: S14A-086; archival: S05B-027, S06A-025, S06B-010, S07A-013, S07B-008,
S08B-008 and S09A-017) and the W.M. Keck Observatory. The Subaru telescope is operated
by the National Astronomical Observatory of Japan. The W.M. Keck Observatory is
operated as a scientific partnership among the California Institute of Technology,
the University of California and the National Aeronautics and Space Administration.
Based on observations made with ESO Telescopes at the La Silla Paranal Observatory
under programme ID 294.A-5018. Based on observations obtained with MegaPrime/Megacam,
a joint project of CFHT and CEA/IRFU, at the Canada–France-Hawaii Telescope (CFHT)
which is operated by the National Research Council (NRC) of Canada, the Institut
National des Science de l’Univers of the Centre National de la Recherche Scientifique
(CNRS) of France, and the University of Hawaii. This work is based in part on data
products produced at Terapix available at the Canadian Astronomy Data Centre as
part of the CFHT Legacy Survey, a collaborative project of NRC and CNRS. Based on
data products from observations made with ESO Telescopes at the La Silla Paranal
Observatory under ESO programme ID 179.A-2005 and on data products produced by TERAPIX
and the Cambridge Astronomy Survey Unit on behalf of the UltraVISTA consortium.\r\nIn
addition to the CFHT-LS and COSMOS-UltraVISTA surveys, we are grateful for the excellent
data sets from the UKIRT-DXS, SXDF and S-COSMOS survey teams, without these legacy
surveys, this research would have been impossible. We have benefited greatly from
the public available programming language PYTHON, including the NUMPY, MATPLOTLIB,
PYFITS, SCIPY and ASTROPY packages, the astronomical imaging tools SEXTRACTOR, SWARP
and SCAMP and the indispensable TOPCAT analysis tool (Taylor 2013)"
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Jorryt J
full_name: Matthee, Jorryt J
id: 7439a258-f3c0-11ec-9501-9df22fe06720
last_name: Matthee
orcid: 0000-0003-2871-127X
- first_name: David
full_name: Sobral, David
last_name: Sobral
- first_name: Sérgio
full_name: Santos, Sérgio
last_name: Santos
- first_name: Huub
full_name: Röttgering, Huub
last_name: Röttgering
- first_name: Behnam
full_name: Darvish, Behnam
last_name: Darvish
- first_name: Bahram
full_name: Mobasher, Bahram
last_name: Mobasher
citation:
ama: 'Matthee JJ, Sobral D, Santos S, Röttgering H, Darvish B, Mobasher B. Identification
of the brightest Lyα emitters at z = 6.6: implications for the evolution of the
luminosity function in the reionization era. Monthly Notices of the Royal Astronomical
Society. 2015;451(1):400-417. doi:10.1093/mnras/stv947'
apa: 'Matthee, J. J., Sobral, D., Santos, S., Röttgering, H., Darvish, B., &
Mobasher, B. (2015). Identification of the brightest Lyα emitters at z = 6.6:
implications for the evolution of the luminosity function in the reionization
era. Monthly Notices of the Royal Astronomical Society. Oxford University
Press. https://doi.org/10.1093/mnras/stv947'
chicago: 'Matthee, Jorryt J, David Sobral, Sérgio Santos, Huub Röttgering, Behnam
Darvish, and Bahram Mobasher. “Identification of the Brightest Lyα Emitters at
z = 6.6: Implications for the Evolution of the Luminosity Function in the Reionization
Era.” Monthly Notices of the Royal Astronomical Society. Oxford University
Press, 2015. https://doi.org/10.1093/mnras/stv947.'
ieee: 'J. J. Matthee, D. Sobral, S. Santos, H. Röttgering, B. Darvish, and B. Mobasher,
“Identification of the brightest Lyα emitters at z = 6.6: implications for the
evolution of the luminosity function in the reionization era,” Monthly Notices
of the Royal Astronomical Society, vol. 451, no. 1. Oxford University Press,
pp. 400–417, 2015.'
ista: 'Matthee JJ, Sobral D, Santos S, Röttgering H, Darvish B, Mobasher B. 2015.
Identification of the brightest Lyα emitters at z = 6.6: implications for the
evolution of the luminosity function in the reionization era. Monthly Notices
of the Royal Astronomical Society. 451(1), 400–417.'
mla: 'Matthee, Jorryt J., et al. “Identification of the Brightest Lyα Emitters at
z = 6.6: Implications for the Evolution of the Luminosity Function in the Reionization
Era.” Monthly Notices of the Royal Astronomical Society, vol. 451, no.
1, Oxford University Press, 2015, pp. 400–17, doi:10.1093/mnras/stv947.'
short: J.J. Matthee, D. Sobral, S. Santos, H. Röttgering, B. Darvish, B. Mobasher,
Monthly Notices of the Royal Astronomical Society 451 (2015) 400–417.
date_created: 2022-07-14T11:57:03Z
date_published: 2015-07-21T00:00:00Z
date_updated: 2022-08-19T08:25:25Z
day: '21'
doi: 10.1093/mnras/stv947
extern: '1'
external_id:
arxiv:
- '1502.07355'
intvolume: ' 451'
issue: '1'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1502.07355
month: '07'
oa: 1
oa_version: Preprint
page: 400-417
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
eissn:
- 1365-2966
issn:
- 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Identification of the brightest Lyα emitters at z = 6.6: implications for
the evolution of the luminosity function in the reionization era'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 451
year: '2015'
...
---
_id: '8456'
abstract:
- lang: eng
text: The large majority of three-dimensional structures of biological macromolecules
have been determined by X-ray diffraction of crystalline samples. High-resolution
structure determination crucially depends on the homogeneity of the protein crystal.
Overall ‘rocking’ motion of molecules in the crystal is expected to influence
diffraction quality, and such motion may therefore affect the process of solving
crystal structures. Yet, so far overall molecular motion has not directly been
observed in protein crystals, and the timescale of such dynamics remains unclear.
Here we use solid-state NMR, X-ray diffraction methods and μs-long molecular dynamics
simulations to directly characterize the rigid-body motion of a protein in different
crystal forms. For ubiquitin crystals investigated in this study we determine
the range of possible correlation times of rocking motion, 0.1–100 μs. The amplitude
of rocking varies from one crystal form to another and is correlated with the
resolution obtainable in X-ray diffraction experiments.
article_number: '8361'
article_processing_charge: No
article_type: original
author:
- first_name: Peixiang
full_name: Ma, Peixiang
last_name: Ma
- first_name: Yi
full_name: Xue, Yi
last_name: Xue
- first_name: Nicolas
full_name: Coquelle, Nicolas
last_name: Coquelle
- first_name: Jens D.
full_name: Haller, Jens D.
last_name: Haller
- first_name: Tairan
full_name: Yuwen, Tairan
last_name: Yuwen
- first_name: Isabel
full_name: Ayala, Isabel
last_name: Ayala
- first_name: Oleg
full_name: Mikhailovskii, Oleg
last_name: Mikhailovskii
- first_name: Dieter
full_name: Willbold, Dieter
last_name: Willbold
- first_name: Jacques-Philippe
full_name: Colletier, Jacques-Philippe
last_name: Colletier
- first_name: Nikolai R.
full_name: Skrynnikov, Nikolai R.
last_name: Skrynnikov
- first_name: Paul
full_name: Schanda, Paul
id: 7B541462-FAF6-11E9-A490-E8DFE5697425
last_name: Schanda
orcid: 0000-0002-9350-7606
citation:
ama: Ma P, Xue Y, Coquelle N, et al. Observing the overall rocking motion of a protein
in a crystal. Nature Communications. 2015;6. doi:10.1038/ncomms9361
apa: Ma, P., Xue, Y., Coquelle, N., Haller, J. D., Yuwen, T., Ayala, I., … Schanda,
P. (2015). Observing the overall rocking motion of a protein in a crystal. Nature
Communications. Springer Nature. https://doi.org/10.1038/ncomms9361
chicago: Ma, Peixiang, Yi Xue, Nicolas Coquelle, Jens D. Haller, Tairan Yuwen, Isabel
Ayala, Oleg Mikhailovskii, et al. “Observing the Overall Rocking Motion of a Protein
in a Crystal.” Nature Communications. Springer Nature, 2015. https://doi.org/10.1038/ncomms9361.
ieee: P. Ma et al., “Observing the overall rocking motion of a protein in
a crystal,” Nature Communications, vol. 6. Springer Nature, 2015.
ista: Ma P, Xue Y, Coquelle N, Haller JD, Yuwen T, Ayala I, Mikhailovskii O, Willbold
D, Colletier J-P, Skrynnikov NR, Schanda P. 2015. Observing the overall rocking
motion of a protein in a crystal. Nature Communications. 6, 8361.
mla: Ma, Peixiang, et al. “Observing the Overall Rocking Motion of a Protein in
a Crystal.” Nature Communications, vol. 6, 8361, Springer Nature, 2015,
doi:10.1038/ncomms9361.
short: P. Ma, Y. Xue, N. Coquelle, J.D. Haller, T. Yuwen, I. Ayala, O. Mikhailovskii,
D. Willbold, J.-P. Colletier, N.R. Skrynnikov, P. Schanda, Nature Communications
6 (2015).
date_created: 2020-09-18T10:07:36Z
date_published: 2015-10-05T00:00:00Z
date_updated: 2021-01-12T08:19:24Z
day: '05'
doi: 10.1038/ncomms9361
extern: '1'
intvolume: ' 6'
keyword:
- General Biochemistry
- Genetics and Molecular Biology
- General Physics and Astronomy
- General Chemistry
language:
- iso: eng
month: '10'
oa_version: Published Version
publication: Nature Communications
publication_identifier:
issn:
- 2041-1723
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
status: public
title: Observing the overall rocking motion of a protein in a crystal
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 6
year: '2015'
...
---
_id: '8498'
abstract:
- lang: eng
text: "In the present note we announce a proof of a strong form of Arnold diffusion
for smooth convex Hamiltonian systems. Let ${\\mathbb T}^2$ be a 2-dimensional
torus and B2 be the unit ball around the origin in ${\\mathbb R}^2$ . Fix ρ >
0. Our main result says that for a 'generic' time-periodic perturbation of an
integrable system of two degrees of freedom $H_0(p)+\\varepsilon H_1(\\theta,p,t),\\quad
\\ \\theta\\in {\\mathbb T}^2,\\ p\\in B^2,\\ t\\in {\\mathbb T}={\\mathbb R}/{\\mathbb
Z}$ , with a strictly convex H0, there exists a ρ-dense orbit (θε, pε, t)(t) in
${\\mathbb T}^2 \\times B^2 \\times {\\mathbb T}$ , namely, a ρ-neighborhood of
the orbit contains ${\\mathbb T}^2 \\times B^2 \\times {\\mathbb T}$ .\r\n\r\nOur
proof is a combination of geometric and variational methods. The fundamental elements
of the construction are the usage of crumpled normally hyperbolic invariant cylinders
from [9], flower and simple normally hyperbolic invariant manifolds from [36]
as well as their kissing property at a strong double resonance. This allows us
to build a 'connected' net of three-dimensional normally hyperbolic invariant
manifolds. To construct diffusing orbits along this net we employ a version of
the Mather variational method [41] equipped with weak KAM theory [28], proposed
by Bernard in [7]."
article_processing_charge: No
article_type: original
author:
- first_name: Vadim
full_name: Kaloshin, Vadim
id: FE553552-CDE8-11E9-B324-C0EBE5697425
last_name: Kaloshin
orcid: 0000-0002-6051-2628
- first_name: K
full_name: Zhang, K
last_name: Zhang
citation:
ama: Kaloshin V, Zhang K. Arnold diffusion for smooth convex systems of two and
a half degrees of freedom. Nonlinearity. 2015;28(8):2699-2720. doi:10.1088/0951-7715/28/8/2699
apa: Kaloshin, V., & Zhang, K. (2015). Arnold diffusion for smooth convex systems
of two and a half degrees of freedom. Nonlinearity. IOP Publishing. https://doi.org/10.1088/0951-7715/28/8/2699
chicago: Kaloshin, Vadim, and K Zhang. “Arnold Diffusion for Smooth Convex Systems
of Two and a Half Degrees of Freedom.” Nonlinearity. IOP Publishing, 2015.
https://doi.org/10.1088/0951-7715/28/8/2699.
ieee: V. Kaloshin and K. Zhang, “Arnold diffusion for smooth convex systems of two
and a half degrees of freedom,” Nonlinearity, vol. 28, no. 8. IOP Publishing,
pp. 2699–2720, 2015.
ista: Kaloshin V, Zhang K. 2015. Arnold diffusion for smooth convex systems of two
and a half degrees of freedom. Nonlinearity. 28(8), 2699–2720.
mla: Kaloshin, Vadim, and K. Zhang. “Arnold Diffusion for Smooth Convex Systems
of Two and a Half Degrees of Freedom.” Nonlinearity, vol. 28, no. 8, IOP
Publishing, 2015, pp. 2699–720, doi:10.1088/0951-7715/28/8/2699.
short: V. Kaloshin, K. Zhang, Nonlinearity 28 (2015) 2699–2720.
date_created: 2020-09-18T10:46:43Z
date_published: 2015-06-30T00:00:00Z
date_updated: 2021-01-12T08:19:41Z
day: '30'
doi: 10.1088/0951-7715/28/8/2699
extern: '1'
intvolume: ' 28'
issue: '8'
keyword:
- Mathematical Physics
- General Physics and Astronomy
- Applied Mathematics
- Statistical and Nonlinear Physics
language:
- iso: eng
month: '06'
oa_version: None
page: 2699-2720
publication: Nonlinearity
publication_identifier:
issn:
- 0951-7715
- 1361-6544
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
status: public
title: Arnold diffusion for smooth convex systems of two and a half degrees of freedom
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 28
year: '2015'
...
---
_id: '14014'
abstract:
- lang: eng
text: We have studied a coupled electronic-nuclear wave packet in nitric oxide using
time-resolved strong-field photoelectron holography and rescattering. We show
that the electronic dynamics mainly appears in the holographic structures whereas
nuclear motion strongly modulates the angular distribution of the rescattered
photoelectrons.
article_number: '112135'
article_processing_charge: No
article_type: original
author:
- first_name: Samuel G
full_name: Walt, Samuel G
last_name: Walt
- first_name: N Bhargava
full_name: Ram, N Bhargava
last_name: Ram
- first_name: Aaron
full_name: von Conta, Aaron
last_name: von Conta
- first_name: Denitsa Rangelova
full_name: Baykusheva, Denitsa Rangelova
id: 71b4d059-2a03-11ee-914d-dfa3beed6530
last_name: Baykusheva
- first_name: Marcos
full_name: Atala, Marcos
last_name: Atala
- first_name: Hans Jakob
full_name: Wörner, Hans Jakob
last_name: Wörner
citation:
ama: 'Walt SG, Ram NB, von Conta A, Baykusheva DR, Atala M, Wörner HJ. Resolving
the dynamics of valence-shell electrons and nuclei through laser-induced diffraction
and holography. Journal of Physics: Conference Series. 2015;635(11). doi:10.1088/1742-6596/635/11/112135'
apa: 'Walt, S. G., Ram, N. B., von Conta, A., Baykusheva, D. R., Atala, M., &
Wörner, H. J. (2015). Resolving the dynamics of valence-shell electrons and nuclei
through laser-induced diffraction and holography. Journal of Physics: Conference
Series. IOP Publishing. https://doi.org/10.1088/1742-6596/635/11/112135'
chicago: 'Walt, Samuel G, N Bhargava Ram, Aaron von Conta, Denitsa Rangelova Baykusheva,
Marcos Atala, and Hans Jakob Wörner. “Resolving the Dynamics of Valence-Shell
Electrons and Nuclei through Laser-Induced Diffraction and Holography.” Journal
of Physics: Conference Series. IOP Publishing, 2015. https://doi.org/10.1088/1742-6596/635/11/112135.'
ieee: 'S. G. Walt, N. B. Ram, A. von Conta, D. R. Baykusheva, M. Atala, and H. J.
Wörner, “Resolving the dynamics of valence-shell electrons and nuclei through
laser-induced diffraction and holography,” Journal of Physics: Conference Series,
vol. 635, no. 11. IOP Publishing, 2015.'
ista: 'Walt SG, Ram NB, von Conta A, Baykusheva DR, Atala M, Wörner HJ. 2015. Resolving
the dynamics of valence-shell electrons and nuclei through laser-induced diffraction
and holography. Journal of Physics: Conference Series. 635(11), 112135.'
mla: 'Walt, Samuel G., et al. “Resolving the Dynamics of Valence-Shell Electrons
and Nuclei through Laser-Induced Diffraction and Holography.” Journal of Physics:
Conference Series, vol. 635, no. 11, 112135, IOP Publishing, 2015, doi:10.1088/1742-6596/635/11/112135.'
short: 'S.G. Walt, N.B. Ram, A. von Conta, D.R. Baykusheva, M. Atala, H.J. Wörner,
Journal of Physics: Conference Series 635 (2015).'
date_created: 2023-08-10T06:37:44Z
date_published: 2015-11-01T00:00:00Z
date_updated: 2023-08-22T08:51:33Z
day: '01'
doi: 10.1088/1742-6596/635/11/112135
extern: '1'
intvolume: ' 635'
issue: '11'
keyword:
- General Physics and Astronomy
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1088/1742-6596/635/11/112135
month: '11'
oa: 1
oa_version: Published Version
publication: 'Journal of Physics: Conference Series'
publication_identifier:
eissn:
- 1742-6596
issn:
- 1742-6588
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: Resolving the dynamics of valence-shell electrons and nuclei through laser-induced
diffraction and holography
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 635
year: '2015'
...
---
_id: '14015'
abstract:
- lang: eng
text: We advance high-harmonic spectroscopy to resolve molecular charge migration
in time and space and simultaneously demonstrate extensive control over the process.
A multidimensional approach enables us to reconstruct both quantum amplitudes
and phases with a resolution of better than 100 attoseconds and to separately
reconstruct field-free and laser- driven charge migration. Our techniques make
charge migration in molecules measurable on the attosecond time scale and open
new avenues for laser control of electronic primary processes.
article_number: '112136'
article_processing_charge: No
article_type: original
author:
- first_name: P M
full_name: Kraus, P M
last_name: Kraus
- first_name: B
full_name: Mignolet, B
last_name: Mignolet
- first_name: Denitsa Rangelova
full_name: Baykusheva, Denitsa Rangelova
id: 71b4d059-2a03-11ee-914d-dfa3beed6530
last_name: Baykusheva
- first_name: A
full_name: Rupenyan, A
last_name: Rupenyan
- first_name: L
full_name: Horný, L
last_name: Horný
- first_name: E F
full_name: Penka, E F
last_name: Penka
- first_name: O I
full_name: Tolstikhin, O I
last_name: Tolstikhin
- first_name: J
full_name: Schneider, J
last_name: Schneider
- first_name: F
full_name: Jensen, F
last_name: Jensen
- first_name: L B
full_name: Madsen, L B
last_name: Madsen
- first_name: A D
full_name: Bandrauk, A D
last_name: Bandrauk
- first_name: F
full_name: Remacle, F
last_name: Remacle
- first_name: H J
full_name: Wörner, H J
last_name: Wörner
citation:
ama: 'Kraus PM, Mignolet B, Baykusheva DR, et al. Attosecond charge migration and
its laser control. Journal of Physics: Conference Series. 2015;635(11).
doi:10.1088/1742-6596/635/11/112136'
apa: 'Kraus, P. M., Mignolet, B., Baykusheva, D. R., Rupenyan, A., Horný, L., Penka,
E. F., … Wörner, H. J. (2015). Attosecond charge migration and its laser control.
Journal of Physics: Conference Series. IOP Publishing. https://doi.org/10.1088/1742-6596/635/11/112136'
chicago: 'Kraus, P M, B Mignolet, Denitsa Rangelova Baykusheva, A Rupenyan, L Horný,
E F Penka, O I Tolstikhin, et al. “Attosecond Charge Migration and Its Laser Control.”
Journal of Physics: Conference Series. IOP Publishing, 2015. https://doi.org/10.1088/1742-6596/635/11/112136.'
ieee: 'P. M. Kraus et al., “Attosecond charge migration and its laser control,”
Journal of Physics: Conference Series, vol. 635, no. 11. IOP Publishing,
2015.'
ista: 'Kraus PM, Mignolet B, Baykusheva DR, Rupenyan A, Horný L, Penka EF, Tolstikhin
OI, Schneider J, Jensen F, Madsen LB, Bandrauk AD, Remacle F, Wörner HJ. 2015.
Attosecond charge migration and its laser control. Journal of Physics: Conference
Series. 635(11), 112136.'
mla: 'Kraus, P. M., et al. “Attosecond Charge Migration and Its Laser Control.”
Journal of Physics: Conference Series, vol. 635, no. 11, 112136, IOP Publishing,
2015, doi:10.1088/1742-6596/635/11/112136.'
short: 'P.M. Kraus, B. Mignolet, D.R. Baykusheva, A. Rupenyan, L. Horný, E.F. Penka,
O.I. Tolstikhin, J. Schneider, F. Jensen, L.B. Madsen, A.D. Bandrauk, F. Remacle,
H.J. Wörner, Journal of Physics: Conference Series 635 (2015).'
date_created: 2023-08-10T06:37:53Z
date_published: 2015-07-01T00:00:00Z
date_updated: 2023-08-22T08:49:14Z
day: '01'
doi: 10.1088/1742-6596/635/11/112136
extern: '1'
intvolume: ' 635'
issue: '11'
keyword:
- General Physics and Astronomy
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1088/1742-6596/635/11/112136
month: '07'
oa: 1
oa_version: Published Version
publication: 'Journal of Physics: Conference Series'
publication_identifier:
eissn:
- 1742-6596
issn:
- 1742-6588
publication_status: published
publisher: IOP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: Attosecond charge migration and its laser control
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 635
year: '2015'
...
---
_id: '14016'
abstract:
- lang: eng
text: All attosecond time-resolved measurements have so far relied on the use of
intense near-infrared laser pulses. In particular, attosecond streaking, laser-induced
electron diffraction and high-harmonic generation all make use of non-perturbative
light–matter interactions. Remarkably, the effect of the strong laser field on
the studied sample has often been neglected in previous studies. Here we use high-harmonic
spectroscopy to measure laser-induced modifications of the electronic structure
of molecules. We study high-harmonic spectra of spatially oriented CH3F and CH3Br
as generic examples of polar polyatomic molecules. We accurately measure intensity
ratios of even and odd-harmonic orders, and of the emission from aligned and unaligned
molecules. We show that these robust observables reveal a substantial modification
of the molecular electronic structure by the external laser field. Our insights
offer new challenges and opportunities for a range of emerging strong-field attosecond
spectroscopies.
article_number: '7039'
article_processing_charge: No
article_type: original
author:
- first_name: P. M.
full_name: Kraus, P. M.
last_name: Kraus
- first_name: O. I.
full_name: Tolstikhin, O. I.
last_name: Tolstikhin
- first_name: Denitsa Rangelova
full_name: Baykusheva, Denitsa Rangelova
id: 71b4d059-2a03-11ee-914d-dfa3beed6530
last_name: Baykusheva
- first_name: A.
full_name: Rupenyan, A.
last_name: Rupenyan
- first_name: J.
full_name: Schneider, J.
last_name: Schneider
- first_name: C. Z.
full_name: Bisgaard, C. Z.
last_name: Bisgaard
- first_name: T.
full_name: Morishita, T.
last_name: Morishita
- first_name: F.
full_name: Jensen, F.
last_name: Jensen
- first_name: L. B.
full_name: Madsen, L. B.
last_name: Madsen
- first_name: H. J.
full_name: Wörner, H. J.
last_name: Wörner
citation:
ama: Kraus PM, Tolstikhin OI, Baykusheva DR, et al. Observation of laser-induced
electronic structure in oriented polyatomic molecules. Nature Communications.
2015;6. doi:10.1038/ncomms8039
apa: Kraus, P. M., Tolstikhin, O. I., Baykusheva, D. R., Rupenyan, A., Schneider,
J., Bisgaard, C. Z., … Wörner, H. J. (2015). Observation of laser-induced electronic
structure in oriented polyatomic molecules. Nature Communications. Springer
Nature. https://doi.org/10.1038/ncomms8039
chicago: Kraus, P. M., O. I. Tolstikhin, Denitsa Rangelova Baykusheva, A. Rupenyan,
J. Schneider, C. Z. Bisgaard, T. Morishita, F. Jensen, L. B. Madsen, and H. J.
Wörner. “Observation of Laser-Induced Electronic Structure in Oriented Polyatomic
Molecules.” Nature Communications. Springer Nature, 2015. https://doi.org/10.1038/ncomms8039.
ieee: P. M. Kraus et al., “Observation of laser-induced electronic structure
in oriented polyatomic molecules,” Nature Communications, vol. 6. Springer
Nature, 2015.
ista: Kraus PM, Tolstikhin OI, Baykusheva DR, Rupenyan A, Schneider J, Bisgaard
CZ, Morishita T, Jensen F, Madsen LB, Wörner HJ. 2015. Observation of laser-induced
electronic structure in oriented polyatomic molecules. Nature Communications.
6, 7039.
mla: Kraus, P. M., et al. “Observation of Laser-Induced Electronic Structure in
Oriented Polyatomic Molecules.” Nature Communications, vol. 6, 7039, Springer
Nature, 2015, doi:10.1038/ncomms8039.
short: P.M. Kraus, O.I. Tolstikhin, D.R. Baykusheva, A. Rupenyan, J. Schneider,
C.Z. Bisgaard, T. Morishita, F. Jensen, L.B. Madsen, H.J. Wörner, Nature Communications
6 (2015).
date_created: 2023-08-10T06:38:01Z
date_published: 2015-05-05T00:00:00Z
date_updated: 2023-08-22T08:52:56Z
day: '05'
doi: 10.1038/ncomms8039
extern: '1'
external_id:
pmid:
- '25940229'
intvolume: ' 6'
keyword:
- General Physics and Astronomy
- General Biochemistry
- Genetics and Molecular Biology
- General Chemistry
- Multidisciplinary
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1038/ncomms8039
month: '05'
oa: 1
oa_version: Published Version
pmid: 1
publication: Nature Communications
publication_identifier:
eissn:
- 2041-1723
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Observation of laser-induced electronic structure in oriented polyatomic molecules
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 6
year: '2015'
...
---
_id: '11582'
abstract:
- lang: eng
text: We have observed a sample of typical z ∼ 1 star-forming galaxies, selected
from the HiZELS survey, with the new K-band Multi-Object Spectrograph (KMOS) near-infrared,
multi-integral field unit instrument on the Very Large Telescope (VLT), in order
to obtain their dynamics and metallicity gradients. The majority of our galaxies
have a metallicity gradient consistent with being flat or negative (i.e. higher
metallicity cores than outskirts). Intriguingly, we find a trend between metallicity
gradient and specific star formation rate (sSFR), such that galaxies with a high
sSFR tend to have relatively metal poor centres, a result which is strengthened
when combined with data sets from the literature. This result appears to explain
the discrepancies reported between different high-redshift studies and varying
claims for evolution. From a galaxy evolution perspective, the trend we see would
mean that a galaxy's sSFR is governed by the amount of metal-poor gas that can
be funnelled into its core, triggered either by merging or through efficient accretion.
In fact, merging may play a significant role as it is the starburst galaxies at
all epochs, which have the more positive metallicity gradients. Our results may
help to explain the origin of the fundamental metallicity relation, in which galaxies
at a fixed mass are observed to have lower metallicities at higher star formation
rates, especially if the metallicity is measured in an aperture encompassing only
the central regions of the galaxy. Finally, we note that this study demonstrates
the power of KMOS as an efficient instrument for large-scale resolved galaxy surveys.
acknowledgement: First, we acknowledge the referee for their comments, which have
improved the clarity of this paper. JPS and IRS acknowledge support from STFC (ST/I001573/1).
IRS also acknowledges support from the ERC Advanced Investigator programme DUSTYGAL
and a Royal Society/Wolfson Merit Award. DS acknowledges financial support from
NWO through a Veni fellowship and from FCT through the award of an FCT-IF starting
grant. PNB acknowledges STFC for financial support.
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: John P.
full_name: Stott, John P.
last_name: Stott
- first_name: David
full_name: Sobral, David
last_name: Sobral
- first_name: A. M.
full_name: Swinbank, A. M.
last_name: Swinbank
- first_name: Ian
full_name: Smail, Ian
last_name: Smail
- first_name: Richard
full_name: Bower, Richard
last_name: Bower
- first_name: Philip N.
full_name: Best, Philip N.
last_name: Best
- first_name: Ray M.
full_name: Sharples, Ray M.
last_name: Sharples
- first_name: James E.
full_name: Geach, James E.
last_name: Geach
- first_name: Jorryt J
full_name: Matthee, Jorryt J
id: 7439a258-f3c0-11ec-9501-9df22fe06720
last_name: Matthee
orcid: 0000-0003-2871-127X
citation:
ama: Stott JP, Sobral D, Swinbank AM, et al. A relationship between specific star
formation rate and metallicity gradient within z ∼ 1 galaxies from KMOS-HiZELS.
Monthly Notices of the Royal Astronomical Society. 2014;443(3):2695-2704.
doi:10.1093/mnras/stu1343
apa: Stott, J. P., Sobral, D., Swinbank, A. M., Smail, I., Bower, R., Best, P. N.,
… Matthee, J. J. (2014). A relationship between specific star formation rate and
metallicity gradient within z ∼ 1 galaxies from KMOS-HiZELS. Monthly Notices
of the Royal Astronomical Society. Oxford University Press. https://doi.org/10.1093/mnras/stu1343
chicago: Stott, John P., David Sobral, A. M. Swinbank, Ian Smail, Richard Bower,
Philip N. Best, Ray M. Sharples, James E. Geach, and Jorryt J Matthee. “A Relationship
between Specific Star Formation Rate and Metallicity Gradient within z ∼ 1 Galaxies
from KMOS-HiZELS.” Monthly Notices of the Royal Astronomical Society. Oxford
University Press, 2014. https://doi.org/10.1093/mnras/stu1343.
ieee: J. P. Stott et al., “A relationship between specific star formation
rate and metallicity gradient within z ∼ 1 galaxies from KMOS-HiZELS,” Monthly
Notices of the Royal Astronomical Society, vol. 443, no. 3. Oxford University
Press, pp. 2695–2704, 2014.
ista: Stott JP, Sobral D, Swinbank AM, Smail I, Bower R, Best PN, Sharples RM, Geach
JE, Matthee JJ. 2014. A relationship between specific star formation rate and
metallicity gradient within z ∼ 1 galaxies from KMOS-HiZELS. Monthly Notices of
the Royal Astronomical Society. 443(3), 2695–2704.
mla: Stott, John P., et al. “A Relationship between Specific Star Formation Rate
and Metallicity Gradient within z ∼ 1 Galaxies from KMOS-HiZELS.” Monthly Notices
of the Royal Astronomical Society, vol. 443, no. 3, Oxford University Press,
2014, pp. 2695–704, doi:10.1093/mnras/stu1343.
short: J.P. Stott, D. Sobral, A.M. Swinbank, I. Smail, R. Bower, P.N. Best, R.M.
Sharples, J.E. Geach, J.J. Matthee, Monthly Notices of the Royal Astronomical
Society 443 (2014) 2695–2704.
date_created: 2022-07-14T12:16:10Z
date_published: 2014-09-21T00:00:00Z
date_updated: 2022-08-19T08:27:25Z
day: '21'
doi: 10.1093/mnras/stu1343
extern: '1'
external_id:
arxiv:
- '1407.1047'
intvolume: ' 443'
issue: '3'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
- 'galaxies: abundances'
- 'galaxies: evolution'
- 'galaxies: kinematics and dynamics'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1407.1047
month: '09'
oa: 1
oa_version: Preprint
page: 2695-2704
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
eissn:
- 1365-2966
issn:
- 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: A relationship between specific star formation rate and metallicity gradient
within z ∼ 1 galaxies from KMOS-HiZELS
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 443
year: '2014'
...
---
_id: '11583'
abstract:
- lang: eng
text: 'Candidate galaxies at redshifts of z ∼ 10 are now being found in extremely
deep surveys, probing very small areas. As a consequence, candidates are very
faint, making spectroscopic confirmation practically impossible. In order to overcome
such limitations, we have undertaken the CF-HiZELS survey, which is a large-area,
medium-depth near-infrared narrow-band survey targeted at z = 8.8 Lyman α (Lyα)
emitters (LAEs) and covering 10 deg2 in part of the SSA22 field with the Canada–France–Hawaii
Telescope (CFHT). We surveyed a comoving volume of 4.7 × 106 Mpc3 to a Lyα luminosity
limit of 6.3 × 1043舁erg舁s−1. We look for Lyα candidates by applying the following
criteria: (i) clear emission-line source, (ii) no optical detections (ugriz from
CFHTLS), (iii) no visible detection in the optical stack (ugriz > 27), (iv) visually
checked reliable NBJ and J detections and (v) J − K ≤ 0. We compute photometric
redshifts and remove a significant amount of dusty lower redshift line-emitters
at z ∼ 1.4 or 2.2. A total of 13 Lyα candidates were found, of which two are marked
as strong candidates, but the majority have very weak constraints on their spectral
energy distributions. Using follow-up observations with SINFONI/VLT, we are able
to exclude the most robust candidates as LAEs. We put a strong constraint on the
Lyα luminosity function at z ∼ 9 and make realistic predictions for ongoing and
future surveys. Our results show that surveys for the highest redshift LAEs are
susceptible of multiple contaminations and that spectroscopic follow-up is absolutely
necessary.'
acknowledgement: We thank the anonymous referee for the comments and suggestions which
improved both the quality and clarity of this work. DS acknowledges financial support
from the Netherlands Organisation for Scientific Research (NWO) through a Veni fellowship.
IRS acknowledges support from STFC (ST/I001573/1), a Leverhulme Fellowship, the
ERC Advanced Investigator programme DUSTYGAL 321334 and a Royal Society/Wolfson
Merit Award. PNB acknowledges support from the Leverhulme Trust. JWK acknowledges
the support from the Creative Research Initiative Program, no. 2008- 0060544, of
the National Research Foundation of Korea (NRF) funded by the Korean government
(MSIP). JPUF and BMJ acknowledge support from the ERC-StG grant EGGS-278202. The
Dark Cosmology Centre is funded by the Danish National Research Foundation. This
work is based in part on data obtained as part of the UKIRT Infrared Deep Sky Survey.
Based on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and
CEA/IRFU, at the Canada–France–Hawaii Telescope (CFHT) which is operated by the
National Research Council (NRC) of Canada, the Institut National des Science de
l’Univers of the Centre National de la Recherche Scientifique (CNRS) of France and
the University of Hawaii. This work is based in part on data products produced at
Terapix available at the Canadian Astronomy Data Centre as part of the Canada-France-Hawaii
Telescope Legacy Survey, a collaborative project of NRC and CNRS. This work was
only possible due to OPTICON/FP7 and the access that it granted to the CFHT telescope.
The authors also wish to acknowledge the CFHTLS and UKIDSS surveys for their excellent
legacy and complementary value – without such high-quality data sets, this research
would not have been possible.
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Jorryt J
full_name: Matthee, Jorryt J
id: 7439a258-f3c0-11ec-9501-9df22fe06720
last_name: Matthee
orcid: 0000-0003-2871-127X
- first_name: David
full_name: Sobral, David
last_name: Sobral
- first_name: A. M.
full_name: Swinbank, A. M.
last_name: Swinbank
- first_name: Ian
full_name: Smail, Ian
last_name: Smail
- first_name: P. N.
full_name: Best, P. N.
last_name: Best
- first_name: Jae-Woo
full_name: Kim, Jae-Woo
last_name: Kim
- first_name: Marijn
full_name: Franx, Marijn
last_name: Franx
- first_name: Bo
full_name: Milvang-Jensen, Bo
last_name: Milvang-Jensen
- first_name: Johan
full_name: Fynbo, Johan
last_name: Fynbo
citation:
ama: 'Matthee JJ, Sobral D, Swinbank AM, et al. A 10 deg2 Lyman α survey at z=8.8
with spectroscopic follow-up: Strong constraints on the luminosity function and
implications for other surveys. Monthly Notices of the Royal Astronomical Society.
2014;440(3):2375-2387. doi:10.1093/mnras/stu392'
apa: 'Matthee, J. J., Sobral, D., Swinbank, A. M., Smail, I., Best, P. N., Kim,
J.-W., … Fynbo, J. (2014). A 10 deg2 Lyman α survey at z=8.8 with spectroscopic
follow-up: Strong constraints on the luminosity function and implications for
other surveys. Monthly Notices of the Royal Astronomical Society. Oxford
University Press. https://doi.org/10.1093/mnras/stu392'
chicago: 'Matthee, Jorryt J, David Sobral, A. M. Swinbank, Ian Smail, P. N. Best,
Jae-Woo Kim, Marijn Franx, Bo Milvang-Jensen, and Johan Fynbo. “A 10 Deg2 Lyman
α Survey at Z=8.8 with Spectroscopic Follow-up: Strong Constraints on the Luminosity
Function and Implications for Other Surveys.” Monthly Notices of the Royal
Astronomical Society. Oxford University Press, 2014. https://doi.org/10.1093/mnras/stu392.'
ieee: 'J. J. Matthee et al., “A 10 deg2 Lyman α survey at z=8.8 with spectroscopic
follow-up: Strong constraints on the luminosity function and implications for
other surveys,” Monthly Notices of the Royal Astronomical Society, vol.
440, no. 3. Oxford University Press, pp. 2375–2387, 2014.'
ista: 'Matthee JJ, Sobral D, Swinbank AM, Smail I, Best PN, Kim J-W, Franx M, Milvang-Jensen
B, Fynbo J. 2014. A 10 deg2 Lyman α survey at z=8.8 with spectroscopic follow-up:
Strong constraints on the luminosity function and implications for other surveys.
Monthly Notices of the Royal Astronomical Society. 440(3), 2375–2387.'
mla: 'Matthee, Jorryt J., et al. “A 10 Deg2 Lyman α Survey at Z=8.8 with Spectroscopic
Follow-up: Strong Constraints on the Luminosity Function and Implications for
Other Surveys.” Monthly Notices of the Royal Astronomical Society, vol.
440, no. 3, Oxford University Press, 2014, pp. 2375–87, doi:10.1093/mnras/stu392.'
short: J.J. Matthee, D. Sobral, A.M. Swinbank, I. Smail, P.N. Best, J.-W. Kim, M.
Franx, B. Milvang-Jensen, J. Fynbo, Monthly Notices of the Royal Astronomical
Society 440 (2014) 2375–2387.
date_created: 2022-07-14T12:33:24Z
date_published: 2014-05-21T00:00:00Z
date_updated: 2022-08-19T08:30:30Z
day: '21'
doi: 10.1093/mnras/stu392
extern: '1'
external_id:
arxiv:
- '1402.6697'
intvolume: ' 440'
issue: '3'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
- 'galaxies: evolution'
- 'galaxies: high-redshift'
- 'cosmology: observations'
- dark ages
- reionization
- first stars
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1402.6697
month: '05'
oa: 1
oa_version: Preprint
page: 2375-2387
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
eissn:
- 1365-2966
issn:
- 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'A 10 deg2 Lyman α survey at z=8.8 with spectroscopic follow-up: Strong constraints
on the luminosity function and implications for other surveys'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 440
year: '2014'
...
---
_id: '13399'
abstract:
- lang: eng
text: Nature has long inspired scientists with its seemingly unlimited ability to
harness solar energy and to utilize it to drive various physiological processes.
With the help of man-made molecular photoswitches, we now have the potential to
outperform natural systems in many ways, with the ultimate goal of fabricating
multifunctional materials that operate at different light wavelengths. An important
challenge in developing light-controlled artificial molecular machines lies in
attaining a detailed understanding of the photoisomerization-coupled conformational
changes that occur in macromolecules and molecular assemblies. In this issue of
ACS Nano, Bléger, Rabe, and co-workers use force microscopy to provide interesting
insights into the behavior of individual photoresponsive molecules and to identify
contraction, extension, and crawling events accompanying light-induced isomerization.
article_processing_charge: No
article_type: original
author:
- first_name: Pintu K.
full_name: Kundu, Pintu K.
last_name: Kundu
- first_name: Rafal
full_name: Klajn, Rafal
id: 8e84690e-1e48-11ed-a02b-a1e6fb8bb53b
last_name: Klajn
citation:
ama: Kundu PK, Klajn R. Watching single molecules move in response to light. ACS
Nano. 2014;8(12):11913-11916. doi:10.1021/nn506656r
apa: Kundu, P. K., & Klajn, R. (2014). Watching single molecules move in response
to light. ACS Nano. American Chemical Society. https://doi.org/10.1021/nn506656r
chicago: Kundu, Pintu K., and Rafal Klajn. “Watching Single Molecules Move in Response
to Light.” ACS Nano. American Chemical Society, 2014. https://doi.org/10.1021/nn506656r.
ieee: P. K. Kundu and R. Klajn, “Watching single molecules move in response to light,”
ACS Nano, vol. 8, no. 12. American Chemical Society, pp. 11913–11916, 2014.
ista: Kundu PK, Klajn R. 2014. Watching single molecules move in response to light.
ACS Nano. 8(12), 11913–11916.
mla: Kundu, Pintu K., and Rafal Klajn. “Watching Single Molecules Move in Response
to Light.” ACS Nano, vol. 8, no. 12, American Chemical Society, 2014, pp.
11913–16, doi:10.1021/nn506656r.
short: P.K. Kundu, R. Klajn, ACS Nano 8 (2014) 11913–11916.
date_created: 2023-08-01T09:45:42Z
date_published: 2014-12-23T00:00:00Z
date_updated: 2023-08-08T07:18:58Z
day: '23'
doi: 10.1021/nn506656r
extern: '1'
external_id:
pmid:
- '25474733'
intvolume: ' 8'
issue: '12'
keyword:
- General Physics and Astronomy
- General Engineering
- General Materials Science
language:
- iso: eng
month: '12'
oa_version: None
page: 11913-11916
pmid: 1
publication: ACS Nano
publication_identifier:
eissn:
- 1936-086X
issn:
- 1936-0851
publication_status: published
publisher: American Chemical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Watching single molecules move in response to light
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 8
year: '2014'
...
---
_id: '13402'
abstract:
- lang: eng
text: Nanoporous frameworks are polymeric materials built from rigid molecules,
which give rise to their nanoporous structures with applications in gas sorption
and storage, catalysis and others. Conceptually new applications could emerge,
should these beneficial properties be manipulated by external stimuli in a reversible
manner. One approach to render nanoporous frameworks responsive to external signals
would be to immobilize molecular switches within their nanopores. Although the
majority of molecular switches require conformational freedom to isomerize, and
switching in the solid state is prohibited, the nanopores may provide enough room
for the switches to efficiently isomerize. Here we describe two families of nanoporous
materials incorporating the spiropyran molecular switch. These materials exhibit
a variety of interesting properties, including reversible photochromism and acidochromism
under solvent-free conditions, light-controlled capture and release of metal ions,
as well reversible chromism induced by solvation/desolvation.
article_number: '3588'
article_processing_charge: No
article_type: original
author:
- first_name: Pintu K.
full_name: Kundu, Pintu K.
last_name: Kundu
- first_name: Gregory L.
full_name: Olsen, Gregory L.
last_name: Olsen
- first_name: Vladimir
full_name: Kiss, Vladimir
last_name: Kiss
- first_name: Rafal
full_name: Klajn, Rafal
id: 8e84690e-1e48-11ed-a02b-a1e6fb8bb53b
last_name: Klajn
citation:
ama: Kundu PK, Olsen GL, Kiss V, Klajn R. Nanoporous frameworks exhibiting multiple
stimuli responsiveness. Nature Communications. 2014;5. doi:10.1038/ncomms4588
apa: Kundu, P. K., Olsen, G. L., Kiss, V., & Klajn, R. (2014). Nanoporous frameworks
exhibiting multiple stimuli responsiveness. Nature Communications. Springer
Nature. https://doi.org/10.1038/ncomms4588
chicago: Kundu, Pintu K., Gregory L. Olsen, Vladimir Kiss, and Rafal Klajn. “Nanoporous
Frameworks Exhibiting Multiple Stimuli Responsiveness.” Nature Communications.
Springer Nature, 2014. https://doi.org/10.1038/ncomms4588.
ieee: P. K. Kundu, G. L. Olsen, V. Kiss, and R. Klajn, “Nanoporous frameworks exhibiting
multiple stimuli responsiveness,” Nature Communications, vol. 5. Springer
Nature, 2014.
ista: Kundu PK, Olsen GL, Kiss V, Klajn R. 2014. Nanoporous frameworks exhibiting
multiple stimuli responsiveness. Nature Communications. 5, 3588.
mla: Kundu, Pintu K., et al. “Nanoporous Frameworks Exhibiting Multiple Stimuli
Responsiveness.” Nature Communications, vol. 5, 3588, Springer Nature,
2014, doi:10.1038/ncomms4588.
short: P.K. Kundu, G.L. Olsen, V. Kiss, R. Klajn, Nature Communications 5 (2014).
date_created: 2023-08-01T09:46:27Z
date_published: 2014-04-07T00:00:00Z
date_updated: 2023-08-08T07:28:10Z
day: '07'
doi: 10.1038/ncomms4588
extern: '1'
external_id:
pmid:
- '24709950'
intvolume: ' 5'
keyword:
- General Physics and Astronomy
- General Biochemistry
- Genetics and Molecular Biology
- General Chemistry
- Multidisciplinary
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1038/ncomms4588
month: '04'
oa: 1
oa_version: Published Version
pmid: 1
publication: Nature Communications
publication_identifier:
eissn:
- 2041-1723
publication_status: published
publisher: Springer Nature
quality_controlled: '1'
scopus_import: '1'
status: public
title: Nanoporous frameworks exhibiting multiple stimuli responsiveness
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 5
year: '2014'
...
---
_id: '14019'
abstract:
- lang: eng
text: The cyclopropene radical cation (c-C3H₄⁺) is an important but poorly characterized
three-membered-ring hydrocarbon. We report on a measurement of the high-resolution
photoelectron and photoionization spectra of cyclopropene and several deuterated
isotopomers, from which we have determined the rovibrational energy level structure
of the X⁺ (2)B2 ground electronic state of c-C3H₄⁺ at low energies for the first
time. The synthesis of the partially deuterated isotopomers always resulted in
mixtures of several isotopomers, differing in their number of D atoms and in the
location of these atoms, so that the photoelectron spectra of deuterated samples
are superpositions of the spectra of several isotopomers. The rotationally resolved
spectra indicate a C(2v)-symmetric R0 structure for the ground electronic state
of c-C3H₄⁺. Two vibrational modes of c-C3H₄⁺ are found to have vibrational wave
numbers below 300 cm(-1), which is surprising for such a small cyclic hydrocarbon.
The analysis of the isotopic shifts of the vibrational levels enabled the assignment
of the lowest-frequency mode (fundamental wave number of ≈110 cm(-1) in c-C3H₄⁺)
to the CH2 torsional mode (ν₈⁺, A2 symmetry) and of the second-lowest-frequency
mode (≈210 cm(-1) in c-C3H₄⁺) to a mode combining a CH out-of-plane with a CH2
rocking motion (ν₁₅⁺, B2 symmetry). The potential energy along the CH2 torsional
coordinate is flat near the equilibrium structure and leads to a pronounced anharmonicity.
article_number: '064317'
article_processing_charge: No
article_type: original
author:
- first_name: K.
full_name: Vasilatou, K.
last_name: Vasilatou
- first_name: J. M.
full_name: Michaud, J. M.
last_name: Michaud
- first_name: Denitsa Rangelova
full_name: Baykusheva, Denitsa Rangelova
id: 71b4d059-2a03-11ee-914d-dfa3beed6530
last_name: Baykusheva
- first_name: G.
full_name: Grassi, G.
last_name: Grassi
- first_name: F.
full_name: Merkt, F.
last_name: Merkt
citation:
ama: 'Vasilatou K, Michaud JM, Baykusheva DR, Grassi G, Merkt F. The cyclopropene
radical cation: Rovibrational level structure at low energies from high-resolution
photoelectron spectra. The Journal of Chemical Physics. 2014;141(6). doi:10.1063/1.4890744'
apa: 'Vasilatou, K., Michaud, J. M., Baykusheva, D. R., Grassi, G., & Merkt,
F. (2014). The cyclopropene radical cation: Rovibrational level structure at low
energies from high-resolution photoelectron spectra. The Journal of Chemical
Physics. AIP Publishing. https://doi.org/10.1063/1.4890744'
chicago: 'Vasilatou, K., J. M. Michaud, Denitsa Rangelova Baykusheva, G. Grassi,
and F. Merkt. “The Cyclopropene Radical Cation: Rovibrational Level Structure
at Low Energies from High-Resolution Photoelectron Spectra.” The Journal of
Chemical Physics. AIP Publishing, 2014. https://doi.org/10.1063/1.4890744.'
ieee: 'K. Vasilatou, J. M. Michaud, D. R. Baykusheva, G. Grassi, and F. Merkt, “The
cyclopropene radical cation: Rovibrational level structure at low energies from
high-resolution photoelectron spectra,” The Journal of Chemical Physics,
vol. 141, no. 6. AIP Publishing, 2014.'
ista: 'Vasilatou K, Michaud JM, Baykusheva DR, Grassi G, Merkt F. 2014. The cyclopropene
radical cation: Rovibrational level structure at low energies from high-resolution
photoelectron spectra. The Journal of Chemical Physics. 141(6), 064317.'
mla: 'Vasilatou, K., et al. “The Cyclopropene Radical Cation: Rovibrational Level
Structure at Low Energies from High-Resolution Photoelectron Spectra.” The
Journal of Chemical Physics, vol. 141, no. 6, 064317, AIP Publishing, 2014,
doi:10.1063/1.4890744.'
short: K. Vasilatou, J.M. Michaud, D.R. Baykusheva, G. Grassi, F. Merkt, The Journal
of Chemical Physics 141 (2014).
date_created: 2023-08-10T06:38:30Z
date_published: 2014-08-14T00:00:00Z
date_updated: 2023-08-22T09:01:31Z
day: '14'
doi: 10.1063/1.4890744
extern: '1'
external_id:
pmid:
- '25134581'
intvolume: ' 141'
issue: '6'
keyword:
- Physical and Theoretical Chemistry
- General Physics and Astronomy
language:
- iso: eng
month: '08'
oa_version: None
pmid: 1
publication: The Journal of Chemical Physics
publication_identifier:
eissn:
- 1089-7690
issn:
- 0021-9606
publication_status: published
publisher: AIP Publishing
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'The cyclopropene radical cation: Rovibrational level structure at low energies
from high-resolution photoelectron spectra'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 141
year: '2014'
...
---
_id: '14020'
abstract:
- lang: eng
text: We report the observation of macroscopic field-free orientation, i.e., more
than 73% of CO molecules pointing in the same direction. This is achieved through
an all-optical scheme operating at high particle densities (>10(17) cm(-3)) that
combines one-color (ω) and two-color (ω+2ω) nonresonant femtosecond laser pulses.
We show that the achieved orientation solely relies on the hyperpolarizability
interaction as opposed to an ionization-depletion mechanism, thus, opening a wide
range of applications. The achieved strong orientation enables us to reveal the
molecular-frame anisotropies of the photorecombination amplitudes and phases caused
by a shape resonance. The resonance appears as a local maximum in the even-harmonic
emission around 28 eV. In contrast, the odd-harmonic emission is suppressed in
this spectral region through the combined effects of an asymmetric photorecombination
phase and a subcycle Stark effect, generic for polar molecules, that we experimentally
identify.
article_number: '023001'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: P. M.
full_name: Kraus, P. M.
last_name: Kraus
- first_name: Denitsa Rangelova
full_name: Baykusheva, Denitsa Rangelova
id: 71b4d059-2a03-11ee-914d-dfa3beed6530
last_name: Baykusheva
- first_name: H. J.
full_name: Wörner, H. J.
last_name: Wörner
citation:
ama: Kraus PM, Baykusheva DR, Wörner HJ. Two-pulse field-free orientation reveals
anisotropy of molecular shape resonance. Physical Review Letters. 2014;113(2).
doi:10.1103/physrevlett.113.023001
apa: Kraus, P. M., Baykusheva, D. R., & Wörner, H. J. (2014). Two-pulse field-free
orientation reveals anisotropy of molecular shape resonance. Physical Review
Letters. American Physical Society. https://doi.org/10.1103/physrevlett.113.023001
chicago: Kraus, P. M., Denitsa Rangelova Baykusheva, and H. J. Wörner. “Two-Pulse
Field-Free Orientation Reveals Anisotropy of Molecular Shape Resonance.” Physical
Review Letters. American Physical Society, 2014. https://doi.org/10.1103/physrevlett.113.023001.
ieee: P. M. Kraus, D. R. Baykusheva, and H. J. Wörner, “Two-pulse field-free orientation
reveals anisotropy of molecular shape resonance,” Physical Review Letters,
vol. 113, no. 2. American Physical Society, 2014.
ista: Kraus PM, Baykusheva DR, Wörner HJ. 2014. Two-pulse field-free orientation
reveals anisotropy of molecular shape resonance. Physical Review Letters. 113(2),
023001.
mla: Kraus, P. M., et al. “Two-Pulse Field-Free Orientation Reveals Anisotropy of
Molecular Shape Resonance.” Physical Review Letters, vol. 113, no. 2, 023001,
American Physical Society, 2014, doi:10.1103/physrevlett.113.023001.
short: P.M. Kraus, D.R. Baykusheva, H.J. Wörner, Physical Review Letters 113 (2014).
date_created: 2023-08-10T06:38:38Z
date_published: 2014-07-11T00:00:00Z
date_updated: 2023-08-22T09:02:56Z
day: '11'
doi: 10.1103/physrevlett.113.023001
extern: '1'
external_id:
arxiv:
- '1311.3923'
pmid:
- '25062172'
intvolume: ' 113'
issue: '2'
keyword:
- General Physics and Astronomy
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1311.3923
month: '07'
oa: 1
oa_version: Preprint
pmid: 1
publication: Physical Review Letters
publication_identifier:
eissn:
- 1079-7114
issn:
- 0031-9007
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Two-pulse field-free orientation reveals anisotropy of molecular shape resonance
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 113
year: '2014'
...