Abstract
Analysis of S K-edge SEXAFS and normal incidence X-ray standing wavefield absorption from the Cu(111)( 7 × 7 )R19°-S structure shows that the surface is composed of a layer of copper sulphide of stoichiometry CuS with a CuS nearest neighbour bond length of 2.30 Å. There appears to be some variability in the exact structure of this phase, but it seems likely that the dominant structure involves a mixture of sulphur atoms both above and below the copper atoms in the sulphide layer, with the sulphur atoms predominantly in hollow sites relative to the substrate, and the overlayer copper atoms in locally identical, low symmetry, off-bridge sites.
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