Abstract
The fluorescence and absorption spectra of various uranium-activated sodium fluoride phosphors have been studied at liquid-nitrogen and liquid-helium temperatures. These results are interpreted in terms of a model in which the uranium ion is surrounded octahedrally by six oxygen ions. Experiments with
18
O have provided support for this atomic configuration, several lines in the fluorescence spectrum having an isotope shift. These isotope shifts are in agreement with the predictions of a general theory of the vibrational fine structure in luminescence spectra.
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