Delocalized versus localized unoccupied 5f states and the uranium site structure in uranium oxides and glasses probed by x-ray-absorption near-edge structure

X-ray-absorption near-edge structure (XANES) spectroscopy at the M/sub 3,4,5/ and L/sub 3/ edges of uranium and thorium using synchrotron radiation has been used to probe the unoccupied 5f electronic states and local structure of uranium sites in oxides and glasses. The uranium sites in hyperstoichi...

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