Abstract
The initial stage of oxygen adsorption on Cu 3Au(100) above 350 K has been investigated using Auger electron spectroscopy. In the temperature range 350–550 K the adsorption isotherms tend to saturate at levels which increase with temperature. Initial sticking coefficients in this temperature range are at least an order of magnitude less than those on Cu(100) and saturation levels vary from ⪅5% of a monolayer at 350 K to ⪅15% of a monolayer at 550 K. As the temperature is increased to within 100 K of the bulk order-disorder transformation, the rate of adsorption increases dramatically accompanied by apparent adsorption-induced rearrangement of the alloy surface. The degree of annealing following Ar + bombardment is observed to affect the initial uptake of oxygen throughout the entire temperature range.
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