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- W1990543556 abstract "The polarised excitation and emission associated with two hexavalent uranium centres in magnesium-doped LiF:U and the unpolarised excitation and emission of a third are analysed in terms of electronic and vibronic transitions. Two centres are considered to be comprised of substitutional UO6 complexes with a Mg2 charge compensation either along a (001) (C4v symmetry) of a (110) (C2v symmetry) direction. The third centre is considered to be a perturbed C2v centre. In the case of the C4v centre an A2 electronic state is located at 20715 cm-1 and an A1 at 20980 cm-1. The vibronic transitions of particular interest are four high-frequency local modes, three of A1 symmetry at 812, 737 and 685 cm-1 and one of E symmetry at 717 cm-1. The number and symmetry of modes are consistent with the UO6 assignment. Three excited states associated with the C2v centre are located at 20545, 20621 and 20706 cm-1 and are shown to have symmetries A2, B2 and A1 respectively. The third centre exhibits a one-to-one correlation in the separation and intensity of the excitation and emission with the C2v centre and the three electronic states in this case are located at 20294, 20392 and 20532 cm-1." @default.
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- W1990543556 date "1987-09-10" @default.
- W1990543556 modified "2023-09-24" @default.
- W1990543556 title "Selective excitation and emission of magnesium-related centers in LiF:U" @default.
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- W1990543556 doi "https://doi.org/10.1088/0022-3719/20/25/027" @default.
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