X-ray absorption fine structure spectroscopy (XAFS) probes the local atomic and chemical environment of a selected atomic species. By analyzing the modulations in the x-ray absorption coefficient at energies just above the x-ray absorption edge threshold, XAFS measurements give quantitative information about coordination species, number, and distance. The x-ray absorption near-edge spectra (XANES) are also sensitive to the valence state of the probe atom.
Principal Techniquesl
Near edge (XANES)l
Speciation of metals in soils, sediments and organisms (small number of atoms) |
Glenn Waychunas Earth Sciences, Berkeley Lab, 1 Cyclotron Road, Berkeley, CA 94720; phone : 510-495-2224, fax : 510-486-5686 ; GAWaychunas@lbl.gov |
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Gordon Brown, Jr. Department of Geology, Stanford University, Stanford, CA, 94305; phone : 415-723-9168, fax: 415-725-2199; gordon@pangea.stanford.edu |
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Paul
Bertsch Savannah River Ecology Laboratory, P.O.Drawer E, University of Georgia, Aiken, SC, 29801; phone : 803-725-2472, fax: 803-725-3309; bertsch@srel.edu |
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François
Farges Laboratoire des géomatériaux Université Marne la vallée Cité Descartes-Champs
S/Marne 77454 Marne la Vallée cedex 2 (France) |
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Matt Newville University of Chicago, Builidng 434A, Argonne National Laboratory, 9700 South Cass Ave., Argonne, IL 60439; phone : 630-252-0431, fax : 630-252-0443; newville@cars.uchicago.edu Matt Newville's Home Page |