Abstract
A general angular correlation function was developed for the calculation in N.M.R. of relaxation times T1 (logitudinal) and T2 (transversal) and of the nuclear Overhauser effect (NOE), in molecules with multiple internal rotations. The models so far proposed assume that the internal motion is a diffusional one (free or restricted) about the various bonds or a jump motion among different conformations of the molecule. The model proposed here in which both diffusional and jumping can occur simultaneously, is quite general. The usual approximation of separating overall tumbling and internal motion is used. The case of a side chain attached to a large macromolecule is treated first. The extension of the approach to an isolated chain is possible using a previous procedure [1]. Early models can be recovered as limiting cases of the developed correlation function.
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