TITLE

Escape rates in bistable systems with position-dependent friction coefficients

AUTHOR(S)
Compiani, Mario
PUB. DATE
January 1993
SOURCE
Journal of Chemical Physics;1/1/1993, Vol. 98 Issue 1, p602
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In this paper we consider the generalization of the Kramers’ model of chemical reactions to the case that the friction coefficient γ(x) depends on the reaction coordinate x. Extending previous efforts the escape rate is exactly evaluated in the high-friction limit imposing on γ(x) much milder conditions than used so far in the literature. The ensuing rate retains the Kramers’ form and reproduces the renormalization effect of the damping coefficient which has been reported in laboratory experiments on chemical reactions. The origin of variable friction coefficients is then discussed within the framework of a multidimensional Markovian model and ascribed to the nonlinear coupling of the reaction coordinate with faster auxiliary variables. Finally, the implications of our results for the rate of ligands migration in proteins are briefly considered.
ACCESSION #
7615450

 

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