Abstract
Recently obtained data on dielectric and NMR relaxation, pulsed EPR, and other methods indicate the presence in glassy liquids of two types of molecular rotational motion. One type corresponds to macroscopic motion of the molecules and is apparent in measurements of mechanical relaxation, macroviscosity, and dielectric ..cap alpha.. relaxation. A small number of molecules display the second type of motion, which is distinguished from the first type by much higher frequency of motion and is apparent in dielectric ..beta.. relaxation, NMR relaxation, and pulsed EPR of spin probes. It is especially characteristic for impurity molecules. We discuss the connection between molecular motion and the structural features of glasses. We indicate examples of chemical reactions whose kinetics are determined by the second type of motion.
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