The thermally activated intermixing in Ag/Au and Au/Ag bilayers supported on a Ru(001) substrate has been studied using the PAX-technique (photoemission of adsorbed xenon). It is found that the Ag/Au interface (on Ru) is thermally more stable than the Au/Ag interface. In the first case Ag atoms do not penetrate into the Au underlayer at 275 K, while in the second case Au atoms do penetrate into the Ag underlayer at this temperature.These investigations also represent a very successful model study which may be carried over the other metal/metal combinations
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 Ag-Au 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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