机译:Special features of the phonon spectrum and non-radiative transitions in the Cr3+-doped ionic-covalent crystals
Univ Tartu, Inst Phys, EE-51014 Tartu, Estonia;
Kuban State Univ, Expt Phys Dept, Krasnodar 350040, Russia;
crystal structure and symmetry; optical properties; phonons; LASER; EMERALD; MODEL;