Influence of electronic polarization on the core x-ray photoemission spectra of Ce compounds

In the Anderson impurity model the screening of localized electrons by polarization is neglected in the construction of the wave functions. We investigated the influence of this polarization on the core x-ray photoemission spectra of Ce compounds. It is shown that taking account of polarization may lead to a different interpretation of the spectra with respect to the 4f occupancy 〈${\mathit{n}}_{\mathit{f}}$ ${\mathrm{〉}}^0$ in the ground state of α-type Ce compounds.