Many-electron effects in post-collision interaction spectra created by Auger cascade of atoms

Abstract

Post-collision interaction has been studied theoretically for the Auger cascade following the near-threshold inner-shell photoionization of of atoms. Correlations of a photoelectron and all the Auger electrons are discussed. The time-dependent theory can include naturally the time ordering of the Auger transitions. Proposed is a formula to represent the energy-spectral peak-profile of the photoelectrons. A numerical example is presented for a model atom. When the number of the Auger transitions increases, the peak width increases less significantly than the peak shift. This is quit in contrast to the usual post-collision interaction in which the peak shift is always accompanied by the peak broadening.