Abstract
Chapter 2 focused on the evolution of a nuclear spin system without examining how it achieves thermal equilibrium with the lattice by energy exchange. The lattice consists of all degrees of freedom, except those of the nuclear spins, associated with molecular rotations and translations in physical systems such as liquid crystals. Spin-lattice relaxation describes how the system of nuclear spins evolves towards thermal equilibrium with the large heat reservoir, the lattice. The spin relaxation rates with which the nuclei arrive at their equilibrium magnetization may be experimentally determined. There is a well-defined connection between the relaxation rates and the dynamics of the lattice provided that the coupling interactions between the nuclear spin system and the lattice are known. Thus, nuclear spin relaxation may be used to study motional processes in molecular systems.KeywordsLiquid CrystalSpectral DensityRelaxation RateSpin RelaxationDipolar CouplingThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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