Abstract
The electronic structures of Pd and (Cu + Pd) overlayers onRu(0001) have been studied. Photoelectron emission spectroscopybased on synchrotron radiation and radiation from a Mg Kαx-ray source has been used to study the valence band of the surfaces and the Ru3d, Pd 3d and Cu 2p core levels. The interaction of Pd with Ru(0001) isstudied in the coverage range of submonolayer to several monolayers. Thecore level spectra of the Pd 3d5/2 level show a new component for Pdcoverages above 1 ML. In the submonolayer range the binding energy (BE)of the Pd 3d5/2 level is constant at 335.08 eV. A state characterizedas an interface state between the Pd adlayer and the Ru substrate isobserved at a BE of 1.22 eV. This state, which dominates the valenceband for submonolayer Pd coverages, has not been reported earlier andit is seen neither for clean Ru(0001) nor for multilayers of Pd. It is acharacteristic that the overlayer d bands are narrower in the low-coverage regime.Deposition of Cu, on a 0.4 ML Pd/Ru(0001) surface up to 1 ML totalcoverage of Pd and Cu, results in a mixed two-dimensional overlayer.
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