Abstract
Starting from the weak collision limit, the BPP theory is applied to develop a theory of nuclear spin-lattice relaxation resulting from random rotational jumps of molecular groups in solids. The molecular motion modeled by an invariant continuous-time random walk on a finite group of rotations is assumed to modulate the dipole-dipole interaction between resonant nuclei. Straightforward group-theoretical techniques are used, yielding analytic expressions for the spin-lattice relaxation times T 1 and T 1 π , The tables included in the text allow our results to be applied to numerous cases of practical interest. The effect of a ( π 2 ) rotational jump of the PF 6 − ion is analyzed to illustrate the theory.
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