Abstract
Codeposition of Ag and Pd on the Ru(0 0 0 1) surface has been studied by photoelectron spectroscopy (PES) by recording of valence band (VB) and 3d 5/2 core electron energy distribution curves (EDCs). Two- and three-dimensional total film coverages in the temperature range 300–765 K have been characterized. At submonolayer total coverage, a flat, monolayer (ML) thick film with some degree of mixing is formed. A stable surface alloy, with Ag–Pd hybridization states ∼2.5 eV binding energy (BE), is found when Pd is deposited after Ag. A 1 nm thick Ag 52Pd 48 film formed by deposition of Pd on a Ag-precovered surface at room temperature exhibits a substantial interdiffusion of Pd and Ag. A stable concentration profile is reached between 550 and 660 K.
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