Abstract
The influence of temperature (varied in the range 77-300 K) on the lifetime (τ) of electronically excited uranyl (UO2 2 +)* in 0.2-5.0 M aqueous solutions of H2SO4 was studied. The activation parameters of the temperature quenching of the uranyl photoluminescence (PL) were determined. The temperature dependences of the rate constant of (UO2 2 +)* PL decay (k = 1/τ) in 0.5 and 5 M H2SO4 obey the Arrhenius equation only at T > 265 K and T > 280 K, respectively. The deviations at low temperatures are probably due to both non-exponential temperature dependence of the viscosity of these solutions and a change in the chemical composition of the solvent (H2SO4 dissociation), which affect the uranyl speciation and hence the luminescence parameters.
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Lotnik, S.V., Khamidullina, L.A. & Kazakov, V.P. Influence of Temperature on the Lifetime of Electronically Excited Uranyl Ion: I. Liquid and Supercooled H2SO4 Solutions. Radiochemistry 45, 550–554 (2003). https://doi.org/10.1023/B:RACH.0000015749.25592.0e
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DOI: https://doi.org/10.1023/B:RACH.0000015749.25592.0e