Abstract
The anisotropy of relaxation time for both 19F and 7Li has been examined in a pure single crystal of lithium fluoride, and is satisfactorily accounted for in terms of Bloembergen's spin-diffusion theory of relaxation. Confirmation is provided by the reduced anisotropy observed in two single crystals of lithium fluoride containing enhanced concentrations (50% and 90%) of 6Li. The lack of anisotropy of the 23Na relaxation time found in sodium chloride accords with the predictions of the theories of quadrupolar relaxation. A similar observation for the 79Br and 81Br relaxation times in potassium bromide is not inconsistent with van Kranendonk's theory and suggests that covalency does not make a strong contribution to the quadrupolar relaxation process.
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