Probing the valence character of O 1s-->Rydberg excited O2 by participator Auger decay measurements and partial ion yield spectroscopy following x-ray absorption

R Feifel; T Tanaka; M Kitajima; H Tanaka; A De Fanis; R Sankari; L Karlsson; S Sorensen; M-N Piancastelli; G Prümper; U Hergenhahn; K Ueda

doi:10.1063/1.2723745

Probing the valence character of O 1s-->Rydberg excited O2 by participator Auger decay measurements and partial ion yield spectroscopy following x-ray absorption

J Chem Phys. 2007 May 7;126(17):174304. doi: 10.1063/1.2723745.

Authors

R Feifel¹, T Tanaka, M Kitajima, H Tanaka, A De Fanis, R Sankari, L Karlsson, S Sorensen, M-N Piancastelli, G Prümper, U Hergenhahn, K Ueda

Affiliation

¹ Department of Physics, Uppsala University, Box 530, SE-751 21 Uppsala, Sweden.

PMID: 17492860
DOI: 10.1063/1.2723745

Abstract

The valence character of O 1s-->Rydberg excited O2 is investigated by means of participator Auger decay spectroscopy, performed at selected photon energies across the K-shell resonance region, and by means of partial ion yield x-ray absorption spectroscopy. For several of the excitation energies studied, the authors find substantial sigma*(4Sigmau-, 2Sigmau-) valence character being mixed with nssigma and npsigma (4Sigmau-, 2Sigmau-) Rydberg states. An experimental indication of a coupling between the channels associated with quartet and doublet ion cores is considered and discussed. New spectroscopic constants are derived for the singly ionized X 2Pig state of O2 based on the observation of at least 20 vibrational sublevels.