Electric Field-Assisted Dissociation Yield of Bound Charge Pairs in Low Permittivity Materials

The intrinsic recombination rate in low permittivity materials must be low to produce an appreciable dissociation yield. Previously, the electric field-assisted dissociation of the charge-transfer (CT) complex was studied using Braun’s approximate equation. We analyze this process using a mathematically strict theory and derive a more accurate analytical expression that reduces to Braun’s equation at low field strength. Our result is based on the assumption that, at a low intrinsic recombination rate, the charge distribution near the reaction radius is close to equilibrium. We also study other effects important for description of the electric field-assisted dissociation yield, such as anisotropy of the initial separation rate and the effect of a large initial separation distance. We use our theoretical results to analyze experimental CT emission data.