REACTION-KINETICS IN MICRODISPERSE SYSTEMS WITH EXCHANGE

The problem of reaction kinetics in microdisperse systems undergoing c ollisional exchange is addressed. The migration of reactants is sugges ted to occur as successive one-particle hopping through fluctuational channels between the droplets during their collisions with temporary m erging. The redistribution dynamics within the droplet encounter pair are described using a stochastic approach. The resulting transition pr obability is calculated as a function of the hopping frequency and the characteristic lifetime of the connecting channels. A hopping mechani sm for collisional exchange is employed in analyzing migration-assiste d time-resolved luminescence quenching. Applications to fluorescence s topped-flow experiments are also discussed. The model is further exten ded to include reaction during micellar collisions. An important parti cular case of an instantaneous reaction is considered, with special re gard to concentration jump experiments.