Irreversibble Bimolecular Reactions of Langevin Particles

Details Irreversibble Bimolecular Reactions of Langevin Particles Irreversibble Bimolecular Reactions of Langevin Particles

2000-12-18

arxiv.org/abs/cond-mat/0012331v1

Physics

Condensed Matter

Statistical Mechanics

29 pages including 7 figures

Scientific paper

10.1063/1.1332807

The reaction A+B --> B is studied when the reactants diffuse in phase space, i.e. their dynamics is described by the Langevin equation. The steady-state rate constants are calculated for both the target (static A and mobile B's) and trapping (mobile A and static B's) problems when the reaction is assumed to occur at the first contact. For Brownian dynamics (i.e., ordinary diffusion), the rate constant for both problems is a monotonically decreasing function of the friction coefficient $\gamma$. For Langevin dynamics, however, we find that the steady-state rate constant exhibits a turnover behavior as a function of $\gamma$ for the trapping problem but not for the target problem. This turnover is different from the familiar Kramers' turnover of the rate constant for escape from a deep potential well because the reaction considered here is an activationless process.

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