Calculations have been carried out for quadrupolar spin-lattice relaxation in NMR experiments, involving nuclei in non-cubic environments, which extend and, in certain cases, correct previous treatments for I= 3 / 2 , 5 / 2 , 7 / 2 and 9 / 2 . In particular, pulsed NMR experiments are treated and the results are presented in a way which reveals non-exponential effects. Since it is not in general meaningful to introduce a spin-lattice relaxation time some emphasis is placed on possible methods for measuring the quantities W 2 and W 1 which are related to the transition rates for Delta m=+or-2 and Delta m=+or-1 transitions involved in two-phonon relaxation processes. Results for 59 Co in K 3 Co(CN) 6 are briefly discussed.
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Gordon et al. (1978) studied this question.
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