DYNAMICS OF COMPETING DIFFUSION-PROCESSES IN A BIAS ELECTRIC-FIELD - KINETIC ISING-MODEL APPROACH AND PHENOMENOLOGICAL DESCRIPTIONS

The methodology of formulating spatio-temporal diffusion-migration equ ations in an applied electric field for two competing diffusion proces ses is outlined using kinetic ising model versions with the help of sp in-exchange dynamics due to Kawasaki. The two transport processes cons idered here correspond to bounded displacement of species attached to supramolecular structures and electron hopping between spatially separ ated electron transfer active centres. The dependence of the diffusion coefficient on number density as well as the microscopic basis underl ying phenomenological diffusion-migration equations are pointed out.