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Theoretical Treatment of the Kinetics of Diffusion-Limited Reactionsby: T. R. Waite
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AbstractThe problem of the kinetics of the diffusion-limited reaction A + B → AB has been formulated in terms of the pair probability densities of the reacting particles (every A taken with every B ). The alteration of these pair densities due to diffusion and reaction have been considered. The competition of every A for every B and the removal of particles from the system upon reaction have been appropriately accounted for. The formulation leads to a set of coupled differential equations that can be solved for a variety of boundary conditions. The problem has been solved in detail for a random initial distribution. The rate of reaction at any time is just the probable rate at which a single A and a single B diffuse together (with an appropriate boundary condition for reaction on close approach) multiplied by the product of the number of A 's and the number of B 's present at that particular time. The rate of the reaction A + B → AB will be second order and the reaction A + B → B will be first order after times long compared to a transient whose form is given explicitly. More general equations are obtained to permit the treatment of non-random initial distributions; as occur; for example; in the annealing of radiation damage. In such cases the irregular transients may account for a major portion of the reaction.
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