Some problems of recombination kinetics. II

The general phenomenological theory of diffusion-controlled defect recombination, in which the identity of similar and dissimilar defects are consistently taken into account and which was presented in part I of this series, is applied here to the reactions A + B → C (Frenkel defect recombination). A + B → B (energy transfer), A + A → B (exciton annihilation). It is shown that during the reaction A + B → C at long reaction times spatial correlations of similar defects (dynamic aggregates) are produced thus leading to a deviation from the quasi-steady reaction constant well known in formal chemical kinetics. (This confirms once more our general idea about the back-coupling of similar and dissimilar reagent spatial correlations.) The validity range of Kirkwood's standard superposition approximation used to decouple three-point densities is also discussed.