HIGH-RESOLUTION X-RAY RESONANT RAMAN-SCATTERING

A general formulation of x-ray resonant Raman scattering is presented. Two main results are found. First, it is argued that recent high resolution experiments, displaying the so-called width narrowing, cannot be discussed in the framework of one-electron theory. Inclusion of many-body effects drastically alters the interpretation of the resonances, as demonstrated by numerical calculations. Second, it is shown that, for fast collisions, a symmetry analysis of the cross section provides a simple description of the observable spectra. © 1995 The American Physical Society.