Surface EXAFS and XANES studies of [formula omitted]S/Ni(111): A pseudo-c(2×2)S/Ni(100) model with surface reconstruction

Abstract

The surface local structure of S/Ni(111) with a complicated (5 3 ×2) LEED pattern is studied by the S K-edge polarization-dependent surface EXAFS and XANES. It is revealed that the first nickel layer of the surface is reconstructed to a distorted-c(2×2)S/Ni(100) overlayer. The nearest neighbor SNi bond distance was found to be 2.22 ± 0.03 Å, which is the same value as that for c(2×2)S/Ni(100). This is the first application of surface EXAFS spectroscopy to a system with such a complicated LEED pattern.