Photoelectron spectra of OCSe and SCSe

Abstract

The He I photoelectron spectra of OCSe and SCSe have been studied and the strong bands observed assigned to ionisation from four valence-shell levels in each case. Weaker bands in the spectrum of SCSe are attributed to the formation of doubly-excited species in which an electron has been excited in addition to the ionisation. The positions of these bands are shown to be related to the transition energies found in the electronic spectrum of the molecule. The same relationship holds for other molecules in which similar “shake-up” bands have been reported.