Europhys. Lett, 48 (5), pp. 580-586 (1999)
The strong-collision model for activated rate processes
A. I. Shushin
Institute of Chemical Physics, Russian Academy of Sciences
117977, GSP-1, Kosygin str. 4, Moscow, Russia
(received 2 June 1999; accepted in final form 30 September 1999)
PACS. 82.20Db - Statistical theories (including
PACS. 82.20Mj - Nonequilibrium kinetics.
PACS. 61.20Lc - Time-dependent properties; relaxation.
The strong-collision model (SCM) for friction (energy dissipation) in condensed phase processes is considered. SCM assumes the instantaneous relaxation of the velocity distribution of a probe particle in the medium to the thermal distribution after each collision with surrounding particles. SCM is applied to the analysis of the kinetics of the passage over a parabolic barrier. Simple formulas for the passing rate (both exact and approximate) are derived and analyzed in detail.
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