Diffusion-Controlled Quenching at Higher Quencher Concentrations

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Abstract
A variational procedure is employed to establish rigorous upper and lower bounds on the rate of a diffusion-controlled reaction, in which an excited species B* is generated at a constant and uniform rate throughout a solution containing a quencher species A. De-excitation is assumed to occur instantaneously whenever a B* molecule has diffused to within a critical distance a of a quencher particle; the Brownian motion of the quencher itself is neglected. Results are obtained in terms of various statistical characterizations of the distribution of A particles in the solution. Explicit calculations have been carried out for the case where the quencher molecules exert no forces upon one another or upon the B* species.

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