Complete Adsorption Site Information for Cl on Cu(111) Using X-Ray Absorption Fine Structure and Photoelectron Diffraction

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Abstract
Surface extended X-ray absorption fine-structure (SEXAFS) studies of the Cu(111) (√3 × √3)R 30°-Cl phase yield a Cu-Cl nearest-neighbour distance of (2.39 ± 0.02) Å and show the Cl atoms to be chemisorbed in threefold hollows. Very simple analysis of photoelectron diffraction data from the same surface distinguishes the two inequivalent threefold hollows (not distinguished in this or previous SEXAFS studies) by establishing the direction of the nearest neighbours. The adsorption site is found to be that which is threefold co-ordinated with respect to both top and second-substrate atom layers.