Final state multiple structures in photoionization of the inner valence shell of H 2S: angular distribution in the 40–70 e V photon energy range

Abstract

Using Synchrotron Radiation in the 40–70 eV photon energy range, we have obtained well resolved photoelectron spectra of the inner valence shell of H 2S and studied the behaviour of the corresponding asymmetry parameters. Our results show that the present and currently accepted theoretical interpretation using Green's function is qualitatively but not quantitatively valid in this case; in the binding energy range where two prominent peaks are predicted we have observed at least six peaks. Nevertheless, the analysis of the asymmetry parameter results suggests that the essential part of the spectrum can be described as corresponding to levels with somewhat mixedorbital with dominant s-type character. Therefore, a breakdown of the molecular orbital model is evident.