Surface EXAFS on Low-Z Elements
Only during the past 12 months has the first surface EXAFS at the carbon and nitrogen K-edge been reported. These experiments, in conjunction with oxygen data, will be discussed. All 3 atoms were adsorbed on Cu and Ni surfaces at 1/2 monolayer coverage. Precise and systematic nearest neighbor bond lengths have been determined. These data in combination with LEED experiments gave a detailed view into the local bonding geometry and the effect of chemically induced reconstruction. Recent Sexafs experiments on hydrocarbons C2H2 and C2H4/Cu (100) yield for the first time bond distances to the Cu-atoms. Also a stretching of the C-C distance was observed. Finally we present more advanced effects in the Sexafs analysis: multiple scattering effects and the Debye-Waller factor in the Exafs amplitude.
KeywordsAnisotropy Hydrocarbon Acetylene Chemisorption Aniso
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