Abstract

Abstract The relationships between experimental quantities which arise due to the dynamics of molecules and the underlying time-correlation functions and time-dependent distribution functions are considered, with special emphasis being given to reorientational motions as detected by dielectric and closely related techniques. It is shown that pictorial representations of angular motion (small-step diffusion, free rotation, collision-interrupted rotation) may be given in terms of three and two dimensional diagrams of the time-dependent orientation distribution functions and that these afford a physical insight and appreciation of the averaged motions of ensembles of molecules.

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