## Abstract

Magnetic Field Effects (MFEs) on the recombination of radicals, which diffuse on an infinite plane, are studied theoretically. The case of spin-selective diffusion-controlled recombination of Radical Pairs (RPs) starting from a random spin state is considered assuming uniform initial distribution of the radicals. In this situation, reaction kinetics is described by a time-dependent rate coefficient K(t), which tends to zero at long times. Strong MFEs on K(t) are predicted that originate from the Δg and hyperfine driven singlet-triplet mixing in the RP. The effects of spin relaxation on the magnetic field are studied, as well as the influence of the dipole-dipole interaction between the electron spins of the RP. In the two-dimensional case, this interaction is not averaged out by diffusion and it strongly affects the MFE. The results of this work are of importance for interpreting MFEs on lipid peroxidation, a magnetosensitive process occurring on two-dimensional surfaces of cell membranes.

Original language | English |
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Article number | 034103 |

Number of pages | 10 |

Journal | Journal of Chemical Physics |

Volume | 152 |

Issue number | 3 |

DOIs | |

Publication status | Published - 21 Jan 2020 |

## Keywords

- INTEGRAL ENCOUNTER THEORY
- SPIN-SELECTIVE RECOMBINATION
- DISSOCIATION REACTION STAGES
- SINGLET-TRIPLET TRANSITIONS
- MULTISTAGE REACTIONS
- NONSTATIONARY KINETICS
- HOMOGENEOUS SOLUTIONS
- LATERAL DIFFUSION
- ACCOUNT
- PAIR