Theory of molecular symmetry in dynamic N.M.R. spectra

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Abstract
The theory developed previously (Part I, 1985, Molec. Phys. 55, 763) is extended over intermolecular spin exchange processes in symmetric molecules. A general form of dynamic N.M.R. lineshape equations is derived which is capable of describing any system of symmetric species in which uniand bi-molecular exchange processes occur. It is demonstrated formally that the exchange processes do not couple symmetry-allowed with symmetry-forbidden coherences. Implications of this selection rule for dynamic N.M.R. lineshape calculations are discussed. The theoretical results having practical significance for lineshape calculations are presented in forms suitable for computer implementation.