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Effects of hybridization on multiplet structures in 3d- and 4d-core photoemission spectra in light rare earth compounds

La or Ce 3d- and 4d-core photoemission spectra are discussed for La and Ce compounds on the basis of the impurity Anderson model taking into account the atomic multiplets due to electron-electron interaction. A consistent explanation of 3d and 4d XPS of La and Ce compounds is presented. We also give an interpretation of the multiplet structures in the spectra. By transforming the Hamiltonian, we show that conditions that promote the "quenching" of the multiplet structure in the solids are small electron-electron interaction, large hybridization between the localized orbit and the valence band, and small energy difference between different fn configurations in the final state.