Studies on the Structural Transformation of Pt Clusters with Adsorbed Hydrogen on α-Al_2O_3(0001) Using Multiple Scattering Approach to Pt L_3-edge Polarized X-Ray Absorption Near Edge Structure Spectra for the Pt Cluster

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The X-ray absorption near edge structure (XANES) or the Extended X-ray absorption fine structure (EXAFS) study with polarization dependence is useful for determining the structures of the metal clusters. We have calculated Pt L_3-edge XANES spectra for various structures of Pt clusters with adsorbed hydrogen, such as the one-layer-thick raft, and the hemispherical and spherical structures on α-Al_2O_3(0001), using the full multiple scattering approach. Comparison of the calculated results with the experimental results have yielded important information. With an increase in the spherically symmetric character of Pt clusters, the influence of Pt-support interaction on the XANES spectra decreases, that is, the hydrogen-Pt interaction plays a dominant role in such cases. We expect that Pt clusters with the one-layer-thick raft, or hemispherical structures are on the top site of surface oxygen atoms.
社団法人応用物理学会の論文
1998-03-15