Abstract
The absorption and emission spectra of the uranyl ion in phosphate glass and in 85 percent phosphoric acid are similar to the dilute aqueous solution, but the luminescence yield is far higher and small concentrations of uranium(IV) occur, possibly as a quasistationary equilibrium with free oxygen. The quantum numbers Ω of the excited states are discussed, based on “weak-field” coupling between 2F 1 2 and ω = 3 2 or 1 2 of π u. Detailed viriations of band positions are related to UO bond length modification, also in borate and germanate glasses. The excited uranyl ion may perform energy transfer to lanthanides, conceivably applicable to lasers.
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