Simple relation for estimating the relative mobility of geminate ions using the influence of electric field on the geminate recombination

The influence of an external electric field on the geminate recombination of ion pairs in weakly polar solutions has been considered. Using an asymptotic dependence of the geminate recombination rate in low electric field [K.M. Hong, J. Noolandi, J. Chem. Phys. 69 (1978) 5026] the simple relation for estimating the relative mobility of the recombining ions has been proposed. The relation has been verified by the results of the computer simulation of ion recombination in solution of charge acceptors both for an isolated ion pair and for a spur containing four primary (solvent cation/electron) pairs.