A theoretical analysis is presented of the problem of how distance-dependent electron transf er in photoinduced forward electron transfer followed by geminate backward electron transfer in liquid solution is re¯ected in the viscosity dependence of the magnetic ® eld e ect ( MFE) on the e ciency of free radical formation u ce in such reactions. The stochastic Liouville equation formalism is employed to model the reaction behaviour of distance-distributed, triplet-born radical pairs ( R Ps) undergoing free di usion, distance-and spin-dependent backward electron transfer, coherent and incoherent spin evolution in the ps time domain. In comparison with real systems the spin situation is simpli® ed by reducing it to a two state S , T 0 problem, yet it is parametrized in a way that allows sensible comparison of the results with those of recent experiments. It is predicted that the MFE on u ce exhibits characteristic minima in the MFE versus viscosity curves, and it is veri® ed in detail that this f eature is peculiar to the di usional model with distance-dependent electron transfer, i.e. cannot be reproduced with the simpler (`exponential') R P model employing distance-independent rate constants. Thus, the MFE versus viscosity curves are established as a genuine ® ngerprint of distance-dependent electron transfer. The theoretical results compare f avourably with recent experimental results obtained with R u III complex/methylviologen RPs.
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