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Broad peaks observed in the photoabsorption spectra of rare earths 10-20 eV above the 4d edge are attributed to transitions 4d^104f^N4d^94f^N+1. Exchange interaction splits the 4d^94f^N+1 configuration and raises some multiplets by 20 eV. Autoionization to 4d^9-4f^N broadens the high levels. The interpretation extends to p processes observed in the absorption of synchrotron light by transition elements.
Dehmer et al. (Mon,) studied this question.