Abstract
A few years ago, the appearance of surface magnetism of vanadium upon graphite was pointed out experimentally and was assumed to be quenched after exposure to CO pollutant: only for freshly evaporated V clusters on graphite, a satellite structure had been found in the V 3s-XPS spectrum and it was attributed to the presence of magnetic moments on the V surface. More recently the appearance of magnetism was observed (by means of other techniques) in a Ru monolayer grown laterally on the C(0001) graphite surface. In the present paper, we extend the impurity Anderson model for the calculation of transition metal core-s-XPS spectra by taking into account the exchange terms, especially between the core hole spin and the transition metal magnetic moment. Our results on core-s-XPS are discussed in terms of the various parameters entering the present model Hamiltonian and a new interpretation of the experimental V 3s-XPS spectrum is proposed.
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