Аннотации:
The temperature dependences of the spin-lattice relaxation of rare-earth ions (RE3+) are investigated in YLiF4 single crystals. The EPR spectra of Er3+ and Dy3+ are detected and studied at the excited levels of the ground terms. The prospects for RE3+-YLiF4 matrices for the production of polarized targets are shown. © 1979 Plenum Publishing Corporation.