Intermolecular nuclear relaxation and RISM pair-correlation function in liquids

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Abstract
The intermolecular proton-proton pair-correlation function (pcf) obtained from the reference interaction site model (RISM) is used as the equilibrium distribution and an effective force in spin relaxation theory. Agreement with experiments on proton dipolar relaxation in liquid acetonitrile, chloroform and ethane is obtained in this analysis. For molecules with non-uniformly distributed spin sites the pair-correlation effect may not be neglected in the treatment of relaxation theory. Aspects concerning uniform pair-distribution and orientational correlations in spin relaxations are briefly discussed.