Non-Debye Reorientation Processes of Molecules. Correlation Functions and Spectral Densities for Spherical Molecules

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Abstract
The non-Debye reorientation processes in which the Debye equation is inapplicable are studied for spherical molecules by using an equation proposed by the author. The physical meaning of the angular correlation in the non-Debye processes is discussed in detail. It is shown that in the non-Debye processes the non-dissipative decay of the mutual-phase correlation of rotating molecules must be taken into account, in addition to the dissipative decay due to molecular collisions, and that the use of the “microscopic viscosity” in the Debye equation is not plausible. It is also shown that, in contrast to the Debye processes, there is no one-to-one correspondence between the correlation time for molecular reorienation and the mean life time of the rotation, since the contribution from the nondissipative decay should be considered also. The vector and the tensor correlation functions,