AN ANALYTICAL MODEL FOR IMPACT DESCRIPTION OF LIQUID-PHASE RELAXATIONPROCESSES

Relaxation of angular momentum and translational velosity of linear an d spherical rotators in liquid phase is considered in the framework of a simple impact model. It is assumed, that in condensed state, when a mean distance between molecules is compared with their diameters, the distribution over the duration of times between successive collisions may deviate from the Poisson one, which is characteristic of rarefied gases. Besides, formation of efficient liquid-phase cage results in p referable reflecting of the target molecule velocity. For correlation functions of angular momentum, linear velocity, for their directions a nd for translational and rotational energies, simple analytical expres sions are obtained. A preliminary analysis shows that reproducing the characteristic negative part of correlation function time dependence, for the begining and duration of this part the model gives values that do not agree with the data of MD calculations.