Nuclear Magnetic Dipole—Dipole Relaxation in Molecules with Internal Motion

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Abstract
The nuclear magnetic dipole—dipole relaxation for nuclei of spin ½ has been calculated for a model in which the length, as well as the orientation, of the internuclear separation vector varies as a result of internal molecular motion. In liquid molecules the internal motion increases the relaxation times, the effect of internal motion is to split the average of the inverse sixth power of internuclear separation into more terms, and most of these terms have shorter correlation times than for a system of rigid molecules with the same distribution of internuclear separation values.