How to interpret DC conductivity in systems with geminate recombination

Aliphatic hydrocarbons are suitable model substances to study early ionization events, since most ion pairs undergo geminate recombination, and the decay function depends on the initial distribution of ionic distances. Whereas microwave (MW) conductivity directly reflects ion concentrations, DC conductivity decays more rapidly because geminate recombinations reverse the nonrandom component added by the DC field to the initial random orientation of the ion pairs. Monte Carlo calculations based on a simple stochastic model taking into account Brownian motion, the effect of the Coulombic field, and that of the external DC field, can model experimental DC conductivity signals. An approximate analytical expression relating DC and MW conductivity is also given