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The three steps of the radical pair mechanism. In the first step, a photon incident on the donor molecule causes one of the electrons of the pair to be donated to the acceptor to create the spatially separated but spin-correlated radical pair. In the second step, the radical pair oscillates between singlet and triplet states under the influence of the Zeeman and hyperfine effects. The third step is comprised of spin-dependent recombination into the chemical product.
