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Absorption and emission spectra of U4 + diluted in the incommensurate structure of ThCl4. Journal de Physique, 1986, 47 (10)

Below T, =95 K, U"+:ThBr4 exists as an incommensurately modulated structure. The U + ions occupy a range of sites which vary from D2d to a limiting D2 site. The D2d and limiting D2 sites have been identifed spectroscopically. We report a parametric analysis of the U + energy levels in both sites. For 26 levels in the D2d site the root-mean-square deviation o.

The absorption and fluorescence spectra 0~ u 4 + diluted in single crystals of ThBr 4have been measured at room• temperature, 77°K, and

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