A theory o f the spin-lattice and spin-spin relaxation processes in quadrupole spin systems with / > 1/2 in the situation o f the m ultiple-pulse N Q R spin locking is proposed for the pulse sequence MW-4. The theory is based on the assumption that for t ^ T2 the change o f the spin system is a quasi-equilibrium process. Rate equations for inverse generalized temperatures are obtained and the kinetic coefficients calculated for the case o f exponential correlation functions. The above assumption was confirmed for som e substances containing the 35C1 and 123Sb, and the time constant T]e characterizing the spin echo signal decay was investigated and compared with the time constant T, in the case o f continuous spin locking.
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