Polarization-dependent resonant anomalous surface X-ray scattering ofA. Menzel1, Y. V. Tolmachev1, K.-C. Chang1, V. Komanicky1, Y. S. Chu2, J. J. Rehr3 and H. You1
1 Argonne National Laboratory, Materials Science Division 9700 S. Cass Ave., Argonne, IL 60439, USA
2 Argonne National Laboratory, Experimental Facility Division 9700 S. Cass Ave., Argonne, IL 60439, USA
3 University of Washington, Department of Physics P.O. Box 351560, Seattle, WA 98195, USA
received 24 January 2006; accepted in final form 19 April 2006
published online 12 May 2006
Polarization dependence of resonant anomalous surface X-ray scattering (RASXS) was studied for interfaces buried in electrolytes and in high-pressure gas. We find that RASXS exhibits strong polarization dependence when the surface is only slightly modified by adsorption of light elements such as carbon monoxide on platinum surfaces. - and -polarization RASXS data were simulated with the latest version of ab initio multiple scattering calculations (FEFF8.2). Based on the simulation, we find that Pt layer to C distances in the ()-3 structure are and for atop and 3-fold , respectively. Some considerations are presented for the origin of the polarization dependence in RASXS.
61.10.-i - X-ray diffraction and scattering.
68.35.Ct - Interface structure and roughness.
82.45.Jn - Surface structure, reactivity and catalysis.
© EDP Sciences 2006