Atomic correlation effects in resonant photoemission of transition elements: Application to copper

Abstract

After a brief review of both experimental and theoretical results on the resonant photoemission below 3p thresholds in first series transition elements, this study presents the main processes to be introduced in any theoretical model, in order to reproduce the resonant behaviour of both primary and satellite lines, corresponding respectively to autoionisation and Auger decay processes. Results concerning partial and total σ3d cross sections for copper, as well as the variation of the corresponding angular distribution parameters are reported and discussed. They have been obtained by introducing the interchannel coupling in both the intial and final state via theR matrix theory and emphasize the importance of these correlation effects in all problems involving open-shell configurations, in particular those connected with the decay of core levels or excited states. This work points out that neglecting off- diagonal energy matrix elements in the continuum leads to larger discrepancies with experiment for the lifetimes than for the cross sections.