Abstract
In this paper we report on the luminescenceproperties of three selectively excited uranate centers in sodium fluoride crystals, v i z. the (UO6⋅VF)×, (UO6⋅VF)× p and (UO5F)× centers. The emission transition is assigned to a 4γ7u →12γ8u transition. The emission spectra and the lowest energy band in the excitation spectrum show vibronic patterns associated with two electronic origins due to splitting of the excited electronic states under C 4v symmetry. The relative intensities of the two vibronic patterns are temperature dependent. The temperature dependence of the decay time of the luminescence of the three uranate centers provides information about the transitions involved in the luminescence processes. An analysis of the vibrational structure in the luminescence spectra is presented.
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