Abstract
The thermally activated intermixing between Ag submonolayer deposits and a complete Au monolayer supported on a Ru(001) substrate was studied using the PAX (photoemission of adsorbed xenon) technique. At 275 K 2D Ag islands exist on the Au monolayer. At 350 K AgAu atom exchange occurs only within the area of the previous Ag islands. Only at even higher temperatures a homogeneous AgAu alloy double layer is formed. This study may, of course, serve as model for other metal/metal combinations.
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