Nuclear Spin-Lattice Relaxation via Paramagnetic Centers

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Abstract
The theory of nuclear spin-lattice relaxation via paramagnetic centers in diamagnetic crystals is investigated in terms of both the single-relaxation-center and the multirelaxation-center models. In this theory, the distances between centers are allowed to be finite. A new case is found for which the theory predicts a new dependence of the spin-lattice relaxation time upon the applied magnetic field, the concentration of the paramagnetic centers, and the magnitude of the diffusion constant. An adaptation of the theory to the rotating reference frame shows that under certain conditions the spin-lattice relaxation time in the rotating frame can be larger than in the laboratory frame.