Correlation effects on core level spectra of adsorbates

The spectrum of core levels in adsorbates is calculated for a model which allows the transfer of screening charge to the adsorbate. Spin degeneracy and the Coulomb interaction of the valence electrons is included. The core level spectrum is calculated within a time dependent Hartree-Fock scheme for broad resonances and from a perturbation expansion for the core hole self-energy in the case of a very narrow valence resonance.