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Higher order speciation effects on plutonium L(3) X-ray absorption near edge spectra
Steven D Conradson1, Kent D Abney, Bruce D Begg
1Materials Science and Technology Division, Seaborg Institute for Transactinum Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. conradson@lanl.gov
Abstract:
Pu L(3) X-ray near edge absorption spectra for Pu(0-VII) are reported for more than 60 chalcogenides, chlorides, hydrates, hydroxides, nitrates, carbonates, oxy-hydroxides, and other compounds both as solids and in solution, and substituted in zirconolite, perovskite, and borosilicate glass. This large database extends the known correlations between the energy and shape of these spectra from the usual association of the XANES with valence and site symmetry to higher order chemical effects. Because of the large number of compounds of these different types, a number of novel and unexpected behaviors are observed, such as effects resulting from the medium and disorder that can be as large as those from valence.