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.
KeywordsMultiple Scattering Beating Effect Experimental Phase Shift Multiple Scatter Effect Triangle Path
Unable to display preview. Download preview PDF.
- 1.J. Stöhr, in X-ray Absorption: Principles, Applications, Techniques of EXAFS, SEXAFS and XANES, edited by R. Prins and D. Koningsberger (Wiley, New York, 1987)Google Scholar
- 5.K. Baberschke, U. Döbler, L. Wenzel, D. Arvanitis, A. Baratoff, K.H. Rieder; Phys. Rev. B33, 5910 (1986)Google Scholar
- 7.M. Bader, C. Ocal, B. Hillert, J. Haase, A.M. Bradshaw; Phys. Rev. B35, 5900 (1987)Google Scholar
- 8.L. Wenzel, D. Arvanitis, W. Daum, H.H. Rotermund, J. Stöhr, K. Baberschke, H. Ibach, submitted for publication.Google Scholar
- 11.D. Arvanitis, L. Wenzel, K. Baberschke, submitted for publicationGoogle Scholar
- 18.D.D. Vvedensky, J.B. Pendry, U. Döbler, K. Baberschke; Phys. Rev. 35, 7756 (1987)Google Scholar