TCB Publications - Abstract

Ernst-Walter Knapp and Klaus Schulten. Magnetic field effect on the hyperfine-induced electron spin motion in radicals undergoing diamagnetic-paramagnetic exchange. Journal of Chemical Physics, 71:1878-1883, 1979.

KNAP79 A semiclassical description of the hyperfine-induced spin motion of radical pairs suggested recently [K. Schulten and P. G. Wolynes, J. Chem. Phys. 68, 3292 (1978)] has been generalized to arbitrary magnetic field situations. Analytical expressions for the elements of the electron spin correlation tensor $<S(o) S(t)>$ averaged over all nuclear spin configurations are derived and applied to calculate the time evolution of the electron spin state of radical pairs initially prepared in a singlet state. The treatment includes the possibility that the radicals undergo a diamagnetic-paramagnetic exchange reaction. The effect of such exchange on the magnetic field of dependence of the radical pair (triplet) recombination is predicted.

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