IMPURITY NUCLEAR-SPIN-LATTICE RELAXATION SUPPRESSION AND CHARGE-EXCHANGE OF CHROMIUM IONS IN A GAMMA-IRRADIATED RUBY CRYSTAL

The possibility of directly separating and measuring the impurity and lattice contributions to nuclear spin-lattice relaxation under the con dition of a steady-state magnetic saturation is demonstrated in the pa rticular case of Al-27 nuclei in a gamma-irradiated ruby crystal. Cont ributions from trivalent and charge-exchanged chromium ions to impurit y nuclear relaxation were separated. The number of charge-exchanged ch romium ions was found. The spin relaxation time of Cr4+ centers was es timated. (C) 1998 Academic Press.