Spectrum analysis of U-doped LaBr3 single crystals. Part 1: crystal-field analysis |
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Authors: | Marcin Sobczyk Miros?aw Karbowiak |
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Institution: | Faculty of Chemistry, University of Wroc?aw, ul. F. Joliot-Curie 14, 50-383 Wroclaw, Poland |
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Abstract: | Single crystals of U3+:LaBr3 were grown by the Bridgman-Stockbarger technique. High-resolution polarized absorption spectra of the crystals were recorded at 4.2 K in the 4000-50,000 cm−1 range. Sixty-four experimental crystal-field energy levels of the U3+ ion were fitted to a semiempirical Hamiltonian employing free-ion, one-electron crystal-field as well as two-particle correlation crystal-field (CCF) operators with an r.m.s. deviation of 28 cm−1. The performed analysis of the spectra enabled the determination of crystal-field parameters and assignment of the observed 5f3→5f3 transitions. The effects of selected CCF operators on the splitting of some specific U3+ multiplets have been investigated and the obtained values of Hamiltonian parameters are discussed and compared with those reported in previous analyses. |
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Keywords: | Uranium(3+) Uranium tribromide U(3+)-doped single crystals Crystal-field Energy levels Crystal-field parameters Correlation crystal-field parameters Low-temperature absorption spectra |
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