Abstract
A phenomenological treatment of dielectric relaxation for symmetric-top gases and binary gas mixtures is developed. It is shown that the orientational Z number is a monotonously increasing function of a collision parameter F=2(IA+IB)/mb02. Long-range attractive forces contribute substantially to the cross sections and give rise to a temperature dependence. A formula is derived which permits the prediction of the cross sections from kinetic-theory data for the molecules. A graphical presentation of the formula illustrates various features of the process. The predictions of the model are shown to be in agreement with dielectric relaxation data for 25 gas mixtures.
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