Abstract
High resolution polarized absorption spectra of U3+:LaCl3 single crystals were recorded in the 4000–50 000 cm−1 range at 7 K. The 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. The performed analysis of the spectra enabled the determination of crystal-field parameters and reassignment of some of the observed 5f3→5f3 transitions. The effects of selected CCF operators on the splitting of some specific U3+ multiplets have been investigated. On the basis of the obtained electronic wave functions the electric-dipole intensity parameters of the total transition dipole strength were determined by fitting the calculated and experimental transition intensities. Among 67 transitions observed in the 4000–22 000 cm−1 range 56 were sufficiently well resolved for quantitative calculations.
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