Abstract
Expressions are derived showing the temperature dependence of the quadrupolar nuclear spin-lattice relaxation time and the angular dependence of the nuclear spinlattice relaxation time as the orientation of the crystal is varied with respect to the magnetic field. The nuclear spin relaxation time is expressed tn terms of the predicted transition probabilities. Spin relaxation time measurements on In/sup 115/ in InSb single crystals at 77 deg K gave an isotropic relaxation time of 0.80 plus or minus 0.05 sec. Temperature dependence measurements of I/sup 127/in KI at 77 to 800 deg K are reported. A discussion of theoretical and experimental results is given. (C.J.G.)
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