TY - JOUR

T1 - Magnetic field effect on recombination of radicals diffusing on a two-dimensional plane

AU - Lukzen, Nikita N.

AU - Ivanov, Konstantin L.

AU - Sadovsky, Vladimir M.

AU - Sagdeev, Renad Z.

PY - 2020/1/21

Y1 - 2020/1/21

N2 - 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.

AB - 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.

KW - INTEGRAL ENCOUNTER THEORY

KW - SPIN-SELECTIVE RECOMBINATION

KW - DISSOCIATION REACTION STAGES

KW - SINGLET-TRIPLET TRANSITIONS

KW - MULTISTAGE REACTIONS

KW - NONSTATIONARY KINETICS

KW - HOMOGENEOUS SOLUTIONS

KW - LATERAL DIFFUSION

KW - ACCOUNT

KW - PAIR

UR - http://www.scopus.com/inward/record.url?scp=85078308836&partnerID=8YFLogxK

U2 - 10.1063/1.5131583

DO - 10.1063/1.5131583

M3 - Article

C2 - 31968965

AN - SCOPUS:85078308836

VL - 152

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

SN - 0021-9606

IS - 3

M1 - 034103

ER -