Abstract

Intra- and intermolecular correlation function and spin-lattice relaxation time ( T 1 and T 1 Q ) expressions are developed for dipolarly coupled spin pairs using group theoretical methods. The spin-carrying molecules being fixed with centers of gravity on equivalent sites of a crystalline lattice are assumed to perform reorientational jumps between the minima of a n-fold equal-wells potential. In particular, single-axis reorientations between wells which are related by the operations of the cyclic groups C n are considered and explicit relaxation time formulas obtained.

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