Resonant Auger decay study of C1s -> pi* core-excited OCS

Research output: Contribution to journalArticle


The present work aims at characterizing short-lived C1s((-1)) pi*((1)) core-excited states of the OCS molecule based on the analysis of the vibrational fine structure and lineshape profiles of the high-resolution resonant Auger decay spectra recorded at the excitation energies along the C1s -> pi* resonance in the binding energy region 15-19eV. Very different behavior in terms of lineshape and resonant enhancement is observed for the (A) over tilde, (B) over tilde and (C) over tilde final states. This is explained by (1) the variation in the C-O bond lengths for the states involved in the electronic relaxation and (2) different contributions in terms of Mulliken population to the molecular orbitals determining the electronic character of the corresponding states. Since the final-state geometries are known from a number of previous experiments and ab initio calculations, the geometry of the C1s((-1)) pi*((1)) intermediate states can be predicted in analogy with e.g. the N-2, CO2 and N2O molecules. (C) 2009 Elsevier B.V. All rights reserved.


External organisations
  • Synchrotron SOLEIL
  • Uppsala University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Atom and Molecular Physics and Optics


  • Core-hole, Renner-Teller, OCS, Electron spectroscopy, Resonant Auger, Core excitation
Original languageEnglish
Pages (from-to)100-106
JournalJournal of Electron Spectroscopy and Related Phenomena
Issue number1-3
Publication statusPublished - 2009
Publication categoryResearch