Static and contact electron transfer within photoinduced geminate ion pairs

The quantum yield and a time of ion pair separation were calculated at any viscosity of solution and arbitrary distance between them at initial moment when geminate charge recombination starts. The results are compared with those obtained in a contact approximation and in a frame of ‘‘exponential model.’’ The way is proposed how to use experimental data on back electron transfer to answer the questions where the ions were born and how long an exchange interaction is between them.