High Resolution X-Ray Resonant Raman Scattering

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Abstract
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.