Probing the valence character of O 1s-->Rydberg excited O2 by participator Auger decay measurements and partial ion yield spectroscopy following x-ray absorption.
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.
Feifel
R
R
Department of Physics, Uppsala University, Box 530, SE-751 21 Uppsala, Sweden.
Tanaka
T
T
Kitajima
M
M
Tanaka
H
H
De Fanis
A
A
Sankari
R
R
Karlsson
L
L
Sorensen
S
S
Piancastelli
M-N
MN
Prümper
G
G
Hergenhahn
U
U
Ueda
K
K