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High resolution low-temperature absorption spectra of 0.2% Pr^3+ dopedCsCdBr_3 were measured in the spectral region 2000--7000 cm-1. Positions andwidths of the crystal field levels within the 3H5, 3H4, 3F2, and 3F3 multipletsof the Pr^3+ main center have been determined. Hyperfine structure of severalspectral lines has been found. Crystal field calculations were carried out inthe framework of the semiphenomenological exchange charge model (ECM).Parameters of the ECM were determined by fitting to the measured totalsplittings of the 3H4 and 3H6 multiplets and to the observed in this workhyperfine splittings of the crystal field levels. One- and two-phononrelaxation rates were calculated using the phonon Green's functions of theperfect (CsCdBr_3) and locally perturbed (impurity dimer centers inCsCdBr_3:Pr^3+) crystal lattice. Comparison with the measured linewidthsconfirmed an essential redistribution of the phonon density of states inCsCdBr_3 crystals doped with rare-earth ions.Comment: 16 pages, 5 tables, 3 figure

physical review. b, condensed matter

High-resolution infrared absorption spectra, crystal-field levels, and relaxation processes in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CsCdBr</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>:</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Pr</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:…

High-resolution infrared absorption spectra, crystal-field levels, and relaxation processes inCsCdBr3:Pr3+