INFLUENCE OF THE FINITE DURATION AND EFFICIENCY OF COLLISIONS ON THE ORIENTATIONAL RELAXATION-TIMES OF NONSPHERICAL MOLECULES IN THE HINDERED ROTATION LIMIT
Ap. Blokhin et Mf. Gelin, INFLUENCE OF THE FINITE DURATION AND EFFICIENCY OF COLLISIONS ON THE ORIENTATIONAL RELAXATION-TIMES OF NONSPHERICAL MOLECULES IN THE HINDERED ROTATION LIMIT, Physica. A, 251(3-4), 1998, pp. 469-484
The present work deals with the influence of the efficiency and finite
duration of intermolecular interactions on the orientational relaxati
on times (ORTs) in the hindered rotation limit. To this end, a single-
particle non-markovian Zwanzig-type master equation is used. The most
general case of asymmetric top molecules is considered and a number of
analytical results is derived. A possibility is demonstrated to extra
ct non-trivial information about the peculiarities of molecular rotati
on and interaction by examining variation of ORTs and ratios of ORTs o
f different ranks vs. the angular momentum relaxation time. The collis
ion efficiency is proved to influence these dependencies markedly. Thi
s effect should be necessarily taken into account in describing the or
ientational relaxation. (C) 1998 Elsevier Science B.V. All rights rese
rved.