Abstract
The electronic structures of Pd and Pt atoms adsorbed on the (110) surface of silver and of the related dilute Ag-(3 at.% Pd) and Ag-(3 at.% Pt) alloys have been studied at room temperature using photoelectron spectroscopy. The observed difference between the lineshape of the virtual bound palladium 4d (platinum 5d) state on the respective isolated atoms supported on the (110) surface and that of an impurity atom embedded in the bulk is well accounted for by a many-body calculation performed within the Anderson single-impurity model. This analysis clearly indicates stronger s-d hybridization in the bulk than at the surface, consistent with the change in coordination number.
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