Abstract
The forward scattering (FS) of the Al Kα induced Pd3d52 photoelectrons and Cu L3M45M45 Auger electrons has been used to probe changes occurring at the Cu/Pd[85 : 15]{110} (2 × 1) alloy surface accompanying the adsorption of oxygen. It is shown that room temperature adsorption of oxygen results in a surface reaction that is evidenced in the solute (Pd) polar-angle intensity plot (PIP) and the solvent (Cu) PIP by the attenuation of the ∼ 60° FS enhancement observed in the {112} direction. There is no evidence to suggest that adsorption of oxygen causes a perturbation of the equilibrium depth profile of Pd in the selvedge. It will be argued that the cause of this change is a surface reconstruction and the effects of various plausible reconstruction models on angle resolved spectra will be presented. A missing row (MR) model is proposed as fitting best with the experimental evidence and the utility of this experimental approach to determine such reactions is discussed.
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