Hannover 2010 – scientific programme
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MO: Fachverband Molekülphysik
MO 8: Poster: Electronic Spectroscopy
MO 8.9: Poster
Tuesday, March 9, 2010, 16:00–18:30, Lichthof
A vibrationally resolved S 2p−1 Auger spectrum of OCS — •Vladimir Sekushin1, Ralph Püttner1, Reinhold Fink2, Michael Martins1, Yuhai Jiang1, Helena Aksela3, Seppo Aksela3, and Günter Kaindl1 — 1Institut für Experimentalphysik, Freie Universität Berlin — 2Institut für Organische Chemie, Universität Würzburg — 3University of Oulu, Department of Physical Sciences, Oulu, Finnland
The high-resolution Auger spectra of OCS subsequent to the S 2p−1 photoionization recorded at the photon energies of 200 eV, 220 eV, and 240 eV are reported along with the corresponding photoelectron spectra. In addition, theoretical results which take the core-hole orientation of the different spin-orbit and molecular-field split S 2p−1 states into account are also presented. Auger transitions to seven quasi-stable dicationic final states are observed and assigned on the basis of the theoretical results. By performing a Franck-Condon analysis and assuming Morse potentials for all states the equilibrium distances Re(C−O) and Re(C−S), the vibrational energies ℏω, and the anharmonicities xℏω for the observed quasi-stable dicationic final states are derived and compared with theoretical results available from literature.