Abstract
We use the Gunnarsson Schönhammer [1] single impurity approach to derive high energy spectra of insulating Re compounds. We have extended the approach to include electron energy loss spectra as well as near edge structure in the X-ray absorption spectra for the LII and LIII edge. Due to the large f degeneracy, Nf, the spectra are similar to the ones found in intermetallic compounds. In particular multiple peaks are also exhibited by insulators. Within the impurity model such spectra features are traced to f valence band hybridization, which may be important even if the f-states are separated by a gap from the valence band. This situation occurs for example in cerium dioxide.
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