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Low energy ion scattering spectroscopy (LEISS) has been used to characterize the evolution of ordered structures of S on the Pd(111) surface during annealing. During exposure of the Pd(111) surface to 0.7L H 2 S at 300K—conditions that produce the S(√3×√3)R30 overlayer—the intensity of the Pd LEIS signal decreases and a feature assigned to adsorbed S appears as the adsorbed layer forms. When...
X-ray photoelectron spectroscopy (XPS) and low energy ion scattering spectroscopy (LEISS) have been used to study the effects of various surface preparations and thermal treatments on the composition of the near-surface region (∼7 atomic layers) and the topmost atomic layer of a polycrystalline Pd 70 Cu 30 alloy. Palladium enrichment (relative to the bulk composition) is observed in...
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