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Non Franck-Condon effects in photoionization of molecular oxygen

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Author

  • Peter Erman
  • Andrzej Karawajczyk
  • Elisabeth Rachlew
  • Jaume Rius i Riu
  • Marek Stankiewicz
  • Ken Yoshiki Franzén
  • A Weider Moen
  • Leif Veseth

Summary, in English

We present a theoretical and experimental analysis of non Franck-Condon effects in photoionization to the b 4Σg- state of O2+. Experimentally, by dispersing the synchrotron radiation induced O2+ b 4Σg- - a 4Πu fluorescence we derive the b 4Σg- state vibrational branching ratios in the excitation energy range 21–34 eV. The vibrational branching ratios reveal features in the region 21–28 eV, indicating strong non Franck-Condon effects. The experimental results have been analysed by computing ab initio the vibrational population branching ratios using a many-body perturbation method. Additionally, the autoionizing neutral states existing in this energy region have been studied. We have computed the energies of the valence states up to an energy of 30 eV, their transition moments for excitations from the ground state, and autoionization rates. Our calculations show, that strong non Franck-Condon effects recorded in the branching ratio spectrum (below 25 eV) are actually caused by the narrow 3σg → σu shape resonance, and its coupling to the 1πu → πg channel.

Publishing year

2000

Language

English

Pages

294-300

Publication/Series

Physica Scripta

Volume

62

Issue

4

Document type

Journal article

Publisher

IOP Publishing

Topic

  • Electrical Engineering, Electronic Engineering, Information Engineering

Status

Published

ISBN/ISSN/Other

  • ISSN: 0031-8949