Abstract
The effect of Hg adsorption on atom ejection patterns in Hg+ ion bombardment of Ni low-index planes has been studied. The atom ejection patterns observed for single-crystal sputtering become smeared out when a Hg film is adsorbed on the target surface. The transition is unusually sharp and is interpreted to be the result of a two-dimensional condensation. A heat of adsorption of 0.69 eV/atom is derived from the model. The sputtering rate of the adsorbed Hg film seems to be determined more by the substrate than by the surface atom binding energy.
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