Electronic structure and Coulomb correlation energy in UO2 single crystal

Abstract High-resolution X-Ray Photoemission Spectroscopy (XPS) and Bremsstrahlung Isochromat Spectroscopy (BIS) measurements are reported for UO2. Clear evidence is found for the localization of the 5f electrons. The Coulomb correlation energy and the p-d gap are determined to be 4.6 ± 0.8 and 5.0 ± 0.4 eV, respectively. A satellite observed 7 eV below the Uranium core levels is assigned to a final state excitation from the valence p band to the empty 5f3 state.

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