Luminescence of Hexavalent Uranium in CaF2and SrF2Powders

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Abstract
A general investigation into the green luminescence of hexavalent uranium in calcium fluoride has been made in the temperature range 5 to 300°K. Two types of spectra have been found, due to different centers. Absorption spectra for these were also observed. The luminescent spectrum has been interpreted as a no-phonon line with vibrational structure on the sides. Assignment of the lines and bands observed has been made on the basis of lattice vibrations, internal local modes of the center, and combinations of these. It has been possible to fit the temperature dependence of the width and the position of the no-phonon line with a theoretical curve using the Debye temperature of the lattice determined from the specific heat. The spectrum of hexavalent uranium in strontium fluoride has many similarities, although it shows evidence of other electronic transitions in the luminescent spectrum.