Abstract
The surface structure of (√3 × √3)R30°-S-Rh(111) has been investigated by normal incidence X-ray standing wavefield (NIXSW) absorption and surface-extended X-ray absorption fine structure (SEXAFS). NIXSW measurements show that the most likely site of adsorption is at the threefold “fcc” hollow, with some lateral disorder. The location of the S atoms at the “fcc” hollow site is consistent with S adsorption on the neighbouring fcc (111) transition metal surfaces. The coherent position relative to the Rh(111) lattice plane was measured to be 1.73±0.05 A ̊ . SEXAFS analysis revealed an S-Rh nearest neighbour bond distance of 2.25±0.04 A ̊ . The combined results of the NIXSW and SEXAFS measurements suggest that there is a net outward surface relaxation of the topmost Rh(111) layers of 0.1±0.05 A ̊ .
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