Abstract
The influence of adsorbates on the surface core-level binding-energy shifts in a Zx(Z+1)1-x alloy system (Z being the atomic number) has been studied in terms of the equivalent core approximation (ECA) and an electronic theory of chemisorption-induced surface segregation. For the H/NixCu1−x system it has been shown that at low bulk Ni concentration the surface core-level shift of Ni undergoes a sign reversal similar to the sign reversal in the heat of segregation found both theoretically and experimentally.
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