General relations for the recombination yield of spin particles

This Letter summarizes the general relationships for the recombination yields through different reactive channels (singlet or triplet) of radical pairs with different precursor states. It is sufficient to calculate one of these combinations, e.g., the singlet recombination from a triplet precursor; the others follow by simple transformations. For strongly dephasing systems, the dependence on the singlet reactivity can be factored out and the recombination yield through any channel and for any precursor state can be expressed in terms of a quantity F ∗ , which is independent of the singlet reactivity.