The high-energy deep-core-level spectra of PrO2 have been studied. Pr 3d x-ray photoemission spectroscopy (XPS), Pr M4,5 x-ray-absorption spectroscopy (XAS) and Pr L3 XAS show many-body effects. The data are analyzed in the framework of the filled-band Anderson-impurity model. Starting from the many-body description of the ground-state, the final states of each core-level spectroscopy are predicted. The effective relaxation energy in the final state decreases going from 3d XPS to L3 XAS to M4,5 XAS because of the repulsive interaction between the excited electron and the 4f electron in XAS spectra. It is shown that the ground state exhibits mixing of many-body configurations 4f1 and 4f2L, where L denotes a hole in the oxygen 2p-derived valence band, separated by the energy E=0.5 eV. A nonzero probability of the occupation of the 4f2L configuration, giving a noninteger 4f count nf=1.6, is found.
ASJC Scopus subject areas
- Condensed Matter Physics