Abstract

Evidence that the lowest excited state of uranyl ion is a triplet state is presented. When uranyl in aqueous solution is complexed with various species (nitrate ion, hydrogen sulfate ion, molecular oxygen) the vibrational fine structure of its absorption spectrum in the portion 3500-5000 A always undergoes the same change, as compared with this structure for uncomplexed uranyl. The observed is a variation in the intensity distribution of the fine structure maxima. Besides a change in intensity distribution, an overall increase in absorption occurs by completing uranyl. (P.C.H.)

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