Abstract
Luminescence spectra of vitrified solutions of uranyl sulfate in a concentrated sulfuric acid are investigated in the range 4.2–80 K in selective laser excitation. It is shown that the luminescence spectra are a superposition of two components — the component that is related to the resonance excitation of uranyl complexes and the component that is caused by the luminescence of uranyl complexes sensitized by the transfer of electron-excitation energy from the resonance-excited centers. The nonselective character is established for the spectral migration of electron-excitation energy with participation of the bending vibrations of the uranyl complex that ensure direct vibrational transitions between neighboring electronic energy levels. The temperature evolution of the luminescence spectra can be described within the framework of the model of configuration coordinates with allowance for only the linear terms of vibronic interaction.
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Syt'ko, V.V., Pokatashkin, V.I. & Umreiko, D.S. Luminescence and Energy Transfer in Frozen Solutions of Uranyl Sulfate in Selective Excitation. Journal of Applied Spectroscopy 67, 857–863 (2000). https://doi.org/10.1023/A:1004115817120
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DOI: https://doi.org/10.1023/A:1004115817120