RADIOTHERMOLUMINESCENCE AND THERMAL DEACTIVATION OF EXCITED UO-ASTERISK(2-SOLVENTS()(2) IONS IN FROZEN ORGANIC)

Thermal quenching of UO22+ luminescence was examined simultaneously w ith radiothermoluminescence of uranyl ions in a number of solvents who se melting points lie within the range from 150 to 291 K. A correlatio n between the position of radiothermoluminescence maximums, which refl ect the release of molecular mobility in frozen solvents, and changes in the parameters of thermal quenching of UO22+ was found. It was dem onstrated that the lifetime of UO22+ dramatically decreases in a narr ow temperature range (100-170 K), which is not coincident with the mel ting point of the solvent. It was found that a compensation relationsh ip is valid for the activation parameters of thermal quenching of UO2 2+ luminescence.