Initial- and final-state correlation in the valence-shell Auger spectrum of Rb.

Abstract

The ${\mathit{M}}_{4,5}$NO and ${\mathit{M}}_{4,5}$NN Auger spectra in Rb have been studied both experimentally and theoretically in order to understand the effect of the outermost 5s electron on the valence-shell hole states in Rb. Transition energies were obtained from extensive multiconfiguration Dirac-Fock calculations and the line intensities from our relativistic single-channel Auger-rate code. The ${\mathit{M}}_{4,5}$NO transitions were reproduced by intermediate-coupling calculations quite well indicating that the initial-state correlation with the 5s electron present is weak. For the ${\mathit{M}}_{4,5}$NN transitions our single-channel calculations revealed dramatic effects of the 5s electron on the configuration interaction in the final ionic states. Even the most elaborate calculations failed, however, to give a basis for complete identification of the observed spectral features.