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Abstract
Synopsis Reduction of up to 50% was observed in nuclear magnetic resonance measurements of relaxation time T 1 of 23 Na in mixed, single phase sodium halide crystals. Van Kranendonk's theory of quadrupole nuclear relaxation mechanism, based on the point-charge model, has been slightly simplified at T/θ ≥ 1, and then applied to this problem. The calculations predict a much smaller reduction. Within the accuracy of the measurements, all relaxation transients show only a single relaxation time present which implies strong spin-spin coupling of all nuclei contributing to the signal, irrespective of the fact that some of its Zeeman levels have been shifted by static quadru-polar effects.
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