Abstract
The specific features revealed in the behavior of temperature dependences of the spin-lattice relaxation time t 1 of quadrupole nuclei involved in different types of thermally activated motions in crystals have been analyzed under the assumption that there exists a temperature dependence of the activation energy of motion. An expression for the spin-lattice relaxation rate has been obtained. This expression includes the effect under consideration and provides an adequate explanation for numerous anomalies in the behavior of the experimental dependences t 1(T), which were revealed in the case of the motion of molecular fragments with a relatively large volume. A nontraditional method for evaluating the activation energy of motion under these conditions has been proposed.
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