The equations for the relaxation time of a nuclear spin in a molecule undergoing diffusion reorientation have been extended to include fully anisotropic reorientation for a number of relaxation mechanisms. The full rotational diffusion tensor—both principal diffusion constants and orientation of the principal rotation axes—can be found by the measurement of the NMR relation times of an appropriate set of nuclei in the molecule.
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Wesley T. Huntress (1968) studied this question.
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