Spectra of the selective excited luminescence of the frozen aqueous uranylsulfate solution

The nature of bands in low-temperature luminescence spectra of uranylsulfate aqueous solution is investigated. It has been found that because of nonequivalence of uranyl luminescence centers in the solution the resonance laser excitation results in appearance in spectra of two series of bands: narrow which correspond to centers directly absorbing laser radiation and spread, corresponding to centers on which nonresonance radiationless energy transfer of electron excitation is realized. The analysis of halfwidth and form of bands corresponding to transitions to ν1(UO22+) sublevels testifies to considerable nonuniform spread of oscillating molecule frequencies with the same energy of electron transition. Much higher than in the uranylsulfate acid solution, of electron energy transfer rate is explained by formation in the investigated solution of uranyl molecule associates