  This study considers electronic transitions within donor-acceptor complexes
dissolved in media with macroscopic polarization. The change of the
polarizability of the donor-acceptor complex in the course of electronic
transition couples to the reaction field of the polar environment and the
electric field created by the macroscopic polarization. An analytical theory
developed to describe this situation predicts a significant asymmetry of the
reorganization energy between charge separation and charge recombination
transitions. This result is proved by Monte Carlo simulations of a model
polarizable diatomic dissolved in a ferroelectric fluid of soft dipolar
spheres. The ratio of the reorganization energies for the forward and backward
reactions up to a factor of 25 is obtained in the simulations. This result, as
well as the effect of the macroscopic electric field, is discussed in
application to the design of efficient photosynthetic devices.
