Temperature- and angular-dependent surface extended X-ray absorption fine structure spectroscopy measurements were reported for the p4g(2 x 2)C/Ni(100) system. Both a Ni(100) single crystal and a 4 monolayer Ni film evaporated on a Cu(100) single crystal were used as substrates. The k-space used for the data analysis needed to be truncated at low k-values. This was due to a strong increase in the atomic background close to the edge, which prevented a clear separation of near-edge features from the extended X-ray absorption fine structure spectroscopy oscillations. For both substrates, the local structure could be described by a clockwise reconstruction of the surface. This led to a strong anisotropy of the vibrational amplitudes: the vibrational amplitude for the out-of-plane C-Ni bond at room temperature was determined to be twice as large as that for the in-plane motion.

Surface EXAFS Study of the p4g(2 x 2) Reconstruction of C on Ni(100) and C on Ni Films. H.Wende, R.Chauvistré, N.Haack, G.Ceballos, F.Wilhelm, K.Baberschke, P.Srivastava, D.Arvanitis: Surface Science, 2000, 465[3], 187-97