SURFACE-HYBRIDIZATION INTERPLAY IN THE SPECTROSCOPY OF CE COMPOUNDS

Evidence is provided of the role of the different hybridization streng th between the surface layers and the bulk in determining the magnitud e of the surface shift for the shallow Ce 4f levels. with respect to d eeper core levels. The analysis is performed on both the surface- and bulk-related f(0) (ionization) and f(2) (affinity) features by means o f photoemission and inverse photoemission, respectively, at various hv . The experimental findings show a good agreement with the results of a model calculation based on the Anderson impurity Hamiltonian.