Abstract
Recently there has been considerable interest in measuring the surface composition of binary alloys. This interest has been generated by a variety of other phenomena (such as catalysis) which are related to the surface composition. Thermodynamic arguments predict that the surface of a multicomponent system will be enriched in the constituent which has the lowest surface free energy.1,2 However, due to a number of experimental difficulties, many of the measurements of the surface enrichment which have been made by Auger electron spectroscopy (AES) have led to confusing results. By using a technique such as low‐energy ion‐scattering spectroscopy (ISS) which has monolayer surface sensitivity, many of the problems encountered in the AES measurements are eliminated.This paper is a report on the measurement of the surface composition of two Ag/Au alloys by ISS. The measurements were made with 1500‐V 4He+ and 20Ne+ as the ion probes. The ion beam was rastered over a 16‐mm2 area to minimize the sputtering which o...
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