The electron transfer in different solvents is investigated for systems
consisting of donor, bridge and acceptor. It is assumed that vibrational
relaxation is much faster than the electron transfer. Electron transfer rates
and final populations of the acceptor state are calculated numerically and in
an approximate fashion analytically. In wide parameter regimes these solutions
are in very good agreement. The theory is applied to the electron transfer in
H2​P−ZnP−Q with free-base porphyrin (H2​P) being the donor,
zinc porphyrin (ZnP) the bridge, and quinone (Q) the acceptor.
It is shown that the electron transfer rates can be controlled efficiently by
changing the energy of the bridging level which can be done by changing the
solvent. The effect of the solvent is determined for different models.Comment: 28 pages + 5 figures, submitted to J. Phys. Chem. For more details
see the Ph. D. thesis in quant-ph archive
http://xxx.lanl.gov/abs/quant-ph/000100