Photo-electron spectroscopy

A quantum mechanical description of photo-electron spectroscopy is presented, and intensities and positions of photo-electron peaks are calculated for some simple systems. The calculations are carried out with a non-orthogonal configuration interaction method (NOCI) that has not been applied before. For Ne the agreement with experiment is generally good. For Ar, where the calculations are more limited in character, the agreement is less satisfactory. It can be concluded that it is worthwhile to further explore the NOCI method as to its applicability, especially also to electronic states of molecules. (Auth.)