Theoretical treatment of the recombination probability of radical pairs with consideration of singlet-triplet transitions induced by paramagnetic relaxation |
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| Institution: | 1. Institute of Physical and Organic Chemistry, Southern Federal University, 194/2 Stachki St., 344090 Rostov on Don, Russian Federation;2. International Tomography Center, Siberian Branch of Russian Academy of Sciences, 3a Institutskaya St., 630090 Novosibirsk, Russian Federation;3. N.M. Emanuel Institute of Biochemical Physics of Russian Academy of Sciences, 4 Kosygina St., 119334 Moscow, Russian Federation;1. Department of Chemistry, Chungnam National University, Daejeon 34134, Republic of Korea;2. Department of Chemistry, Pohang University of Science and Technology, Pohang 37673, Republic of Korea |
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| Abstract: | The recombination probability was calculated for several models of radical pairs (RPs). The singlet-triplet transitions induced by the relaxation mechanism and by the difference of Larmor frequencies of the unpaired electrons of the two radicals of the pair were taken into account. The dependence of the recombination probability on the external magnetic field and on the lifetime of the RP was analyzed. It was pointed out that the different mechanisms of S-T mixing make non-additive contributions. An important part is played by the interferences of the contributions of longitudinal and transverse relaxations. In systems with sufficiently long lifetimes of RPs the recombination probability changes strongly in relatively low magnetic fields, whereas in the same systems the values of paramagnetic relaxation rate changes strongly in higher magnetic fields. |
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