High-resolution infrared absorption spectra, crystal-field levels, and relaxation processes in CsCdBr3 : Pr3+ - art. no. 075103

High-resolution low-temperature absorption spectra of 0.2% Pr3+-doped CsCdB r3 were measured in the spectral region 2000-7000 cm(-1). Positions and wid ths of the crystal-field levels within the H-3(5), H-3(4), F-3(2), and F-3( 3) multiplets of the Pr3+ main center have been determined. The hyperfine s tructure of several spectral lines has been found. Crystal-field calculatio ns were carried out in the framework of the semiphenomenological exchange c harge model (ECM). Parameters of the ECM were determined by fitting to the measured total splittings of the H-3(4) and H-3(6) multiplets and to the ob served hyperfine splittings of the crystal-field levels in this work. One- and two-phonon relaxation rates were calculated using the phonon Green's fu nctions of the perfect (CsCdBr3) and locally perturbed (impurity dimer cent ers in CsCdBr3:Pr3+) crystal lattice. Comparison with the measured linewidt hs confirmed an essential redistribution of the phonon density of states in CsCdBr3 crystals doped with rare-earth ions.