Theory of Photoemission, Photoabsorption and Inverse Photoemission in CeO2and Metallic Ce Compounds

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Abstract
Ce 3d core X-ray photoemission (3d-XPS), 3d core photoabsorption (3d-XAS), 3d core resonant photoemission (3d-RXPS) and bremsstrahlung isochromat spectra (BIS) in a mixed valent insulator CeO2 and typical metallic mixed valent Ce compounds such as CeRh3 are studied theoretically on the basis of the Anderson model. By assuming that the weight of 4f0 configuration in the ground state, the 4f-valence band mixing and the 4f-4f Coulomb interaction for CeO2 are considerably larger than those for metallic Ce compounds, a remarkable difference in 3d-XPS and an apparent similarity in 3d-XAS between the two systems are consistently explained. Furthermore differences in 3d-RXPS and in BIS between the two systems expected from the present analysis are predicted. A preliminary discussion about the effect of 4f-core hole and 4f-4f exchange interactions on core absorption spectra in mixed valent systems is also presented.