Adsorption and surface alloying of lead monolayers on (111) and (110) faces of gold

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Abstract
Auger electron spectroscopy and low energy diffraction have been used to study monolayers of lead deposited in ultrahigh vacuum on to (111) and (110) faces of gold. Comparison is made with a previous study of the (100) substrate. The succession of structure is similar on all three faces: low density arrangements followed by a compact hexagonal monolayer followed by another hexagonal arrangement which is interpreted as the intermetallic compound AuPb2. (A previous interpretation in terms of AuPb3, based on observations on the (100) face, is corrected.) The completion of the first monolayer is marked by sharp knees in the plots of the Auger signals as a function of evaporation time. Essentially the same alloy structure is found on all three faces. There are only slight differences due to differences in the substrate symmetry and structure.