Absorption fine structure spectroscopy Adsorbed metals

Using Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy, Waychunas et al. (1993) determined the geometry of As(V) adsorbed on ferrihydrite and goethite and confirmed the formation of a binudear, and to a lesser extent, monodentate inner-sphere surface complex. Manning et al. (1998) used EXAFS to show that As(III) also forms inner-sphere surface complexes on goethite. (Note, a thorough review of the molecular-scale structure and chemistry of As adsorbed by crystalline and x-ray amorphous metal oxides is presented by Foster (this volume). 

EXAFS spectroscopy is a powerful method for determining the atomic structure of metal and metal carbonyl clusters. [72] Analysis of the results provides coordination numbers as well as distances of metal-metal, [72] metal-support, [73] and metal-adsorbate contributions. [74, 75] In an EXAFS experiment. X-ray absorption measurements are made in the region of the absorption edges of the metal. The fine structure observed at energies slightly greater than that of the... 

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