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- W2007219291 abstract "The crystal-field-split levels of divalent, trivalent, and tetravalent uranium ions have been studied at 20 ifmmode^circelsetextdegreefi{}K in selected crystals having single charge-compensation sites. Complete calculations have been made for the free-ion energy levels of ${mathrm{U}}^{4+}$, with the pertinent constants determined as ${F}_{0}=13175$, ${F}_{2}=200$, ${F}_{4}=40$, ${F}_{6}=8.05$, ${ensuremath{zeta}}_{5f}=1660$, and $ensuremath{alpha}=26$. Also calculated crystal-field-split levels of ${mathrm{U}}^{4+}$ in ${C}_{3v}$ symmetry are compared to experimental values, and the various best fit values of the crystal-field constants determined. ESR results on trigonal Ca${mathrm{F}}_{2}$: ${mathrm{U}}^{4+}$ are correlated with predicted values derived from optical measurements. Experimental studies of the ${mathrm{U}}^{2+}$ ion in calcium fluoride are related to the probable ${mathrm{U}}^{2+}$ configuration, ${f}^{3}s$. Crystal-field splittings of the lower levels of Ca${mathrm{F}}_{2}$: ${mathrm{U}}^{2+}$ are determined from measurements of absorption and fluorescence at 20ifmmode^circelsetextdegreefi{}K. The calculated value of ${ensuremath{zeta}}_{5f}$ for ${mathrm{U}}^{2+}$, based on approximate $Lensuremath{-}S$ coupling conditions for the lowest levels, is 1560 ${mathrm{cm}}^{ensuremath{-}1}$, and is compared with a similarly calculated value for ${mathrm{U}}^{3+}$ of 1520 ${mathrm{cm}}^{ensuremath{-}1}$. Experimental crystal-field-split levels of tetragonal Ca${mathrm{F}}_{2}$: ${mathrm{U}}^{3+}$ are shown to fit symmetry requirements, and various laser wavelengths of Ca${mathrm{F}}_{2}$: ${mathrm{U}}^{3+}$ are related to the level system derived from absorption and fluorescence measurements. Temperature shifts of crystal-field-split levels of uranium ions are also reported." @default.
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- W2007219291 date "1970-10-01" @default.
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- W2007219291 title "Energy Levels of Uranium Ions in Calcium Fluoride Crystals" @default.
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- W2007219291 doi "https://doi.org/10.1103/physrevb.2.2273" @default.
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