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

Surface EXAFS and XANES Studies of (5√3 x 2)S/Ni(111) - a Pseudo-c(2 x 2)S/Ni(100) Model with Surface Reconstruction. Y.Kitajima, T.Yokoyama, T.Ohta, M.Funabashi, N.Kosugi, H.Kuroda: Surface Science, 1989, 214[3], L261-9