Abstract
A test of the continuum model for diffusion controlled reactions as applied to fluorescence quenching is presented and discussed. By proper selection of systems, it was possible to observe nonexponential decay which followed the decay law exp(−at − 2b√t) as predicted by the continuum model. Analysis of these decay curves gave the encounter radius and pair diffusion coefficient. Reasonable values were obtained for both. Steady−state fluorescence quenching measurements were also made and compared with fluorescence decay studies. Evidence was found for ground−state complex formation. When this was taken into account, good agreement between the continuum model and the experimental results was obtained.
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