Abstract
We have examined palladium deposits on the (0001) face of α-alumina, using X-ray photoemission. The evolutions of the Pd3d binding energy (BE) and intensity were followed for various palladium vapour fluxes. Energy referencing with use of the Al 2p peak confirms the electrostatic origin of the decreasing BE for increasing palladium deposits. Taking the metal Fermi level as a reference shows a general tendency to increasing BE with cluster size, the details of the evolution depending on the actual structure of the deposits. This behaviour is attributed to valence band broadening, as a consequence of the changes in the number of nearest neighbours.
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