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Dynamics of proton migration and dissociation in core-excited ethyne probed by multiple ion momentum imaging

Laksman, Joakim LU ; Céolin, Denis LU ; Gisselbrecht, Mathieu LU ; Canton, Sophie LU and Ristinmaa Sörensen, Stacey LU (2009) In Journal of Chemical Physics 131(24). p.1-244305
Abstract
The study focuses on the rapid geometry change in ethyne, excited near the carbon 1s edge. Core excitation and ionization leads to population of dicationic states in ethyne. We study three competing dissociation pathways associated with deprotonation in the linear ethyne molecule, and two cases of rapid proton migration. We investigate the alignment of the molecule in the excited state, and find startling differences in these three cases. We present evidence for a strong anisotropy in the production of H+2 /C+2 fragments through a rapid deformation of the molecule to a dibridged conformation with the transition dipole moment parallel to the polarization of the exciting radiation.
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
synchrotron, ethyne, radiation, anisotropy, velocity, map, core, imaging, excitation
in
Journal of Chemical Physics
volume
131
issue
24
pages
1 - 244305
publisher
American Institute of Physics
external identifiers
  • wos:000273217000029
  • scopus:73649098289
ISSN
0021-9606
DOI
10.1063/1.3270159
language
English
LU publication?
yes
id
cee9659d-06d0-4316-b074-6cbc289b96ab (old id 1528257)
date added to LUP
2010-01-14 11:23:36
date last changed
2017-10-01 03:49:46
@article{cee9659d-06d0-4316-b074-6cbc289b96ab,
  abstract     = {The study focuses on the rapid geometry change in ethyne, excited near the carbon 1s edge. Core excitation and ionization leads to population of dicationic states in ethyne. We study three competing dissociation pathways associated with deprotonation in the linear ethyne molecule, and two cases of rapid proton migration. We investigate the alignment of the molecule in the excited state, and find startling differences in these three cases. We present evidence for a strong anisotropy in the production of H+2 /C+2 fragments through a rapid deformation of the molecule to a dibridged conformation with the transition dipole moment parallel to the polarization of the exciting radiation.},
  author       = {Laksman, Joakim and Céolin, Denis and Gisselbrecht, Mathieu and Canton, Sophie and Ristinmaa Sörensen, Stacey},
  issn         = {0021-9606},
  keyword      = {synchrotron,ethyne,radiation,anisotropy,velocity,map,core,imaging,excitation},
  language     = {eng},
  number       = {24},
  pages        = {1--244305},
  publisher    = {American Institute of Physics},
  series       = {Journal of Chemical Physics},
  title        = {Dynamics of proton migration and dissociation in core-excited ethyne probed by multiple ion momentum imaging},
  url          = {http://dx.doi.org/10.1063/1.3270159},
  volume       = {131},
  year         = {2009},
}