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I discuss a theoretical description of the resonant x-ray emissionspectroscopy (RXES) that is based on the Anderson impurity model. Theparameters entering the model are determined from material-specific LDA+DMFTcalculations. The theory is applicable across the whole f series, not only inthe limits of nearly empty (La, Ce) or nearly full (Yb) valence f shell. Itsperformance is illustrated on the pressure-enhanced intermediate valency ofelemental praseodymium. The obtained results are compared to the usualinterpretation of RXES, which assumes that the spectrum is a superposition ofseveral signals, each corresponding to one configuration of the 4f shell. Thepresent theory simplifies to such superposition only if nearly all effects ofhybridization of the 4f shell with the surrounding states are neglected.Although the assumption of negligible hybridization sounds reasonable forlanthanides, the explicit calculations show that it substantially distorts theanalysis of the RXES data.

Theory of resonant x-ray emission spectra in compounds with localized f electrons