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

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Author

Summary, in English

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.

Publishing year

2009

Language

English

Pages

1-244305

Publication/Series

Journal of Chemical Physics

Volume

131

Issue

24

Document type

Journal article

Publisher

American Institute of Physics (AIP)

Topic

  • Atom and Molecular Physics and Optics

Keywords

  • synchrotron
  • ethyne
  • radiation
  • anisotropy
  • velocity
  • map
  • core
  • imaging
  • excitation

Status

Published

ISBN/ISSN/Other

  • ISSN: 0021-9606