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Effects of weak magnetic fields on free radical recombination reactions

Timmel, C.R., Till, U., Brocklehurst, B., Mclauchlan, K.A., Hore, P.J.·1998·Molecular Physics
DOI 10.1080/00268979809483134
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Abstract

The radical pair mechanism is used to elucidate how applied magnetic fields that are weaker in strength than typical hyperfine interactions can influence the yields and kinetics of recombination reactions of free radicals in solution. The so-called low field effect is shown to arise from coherent superpositions of degenerate electron-nuclear spin states in a spin-correlated radical pair in zero field. A weak applied magnetic field causes these (zero-quantum) coherences to oscillate, leading to coherent interconversion of singlet and triplet electronic states of the radical pair and hence changes in the yields of recombination products and of the free radicals that escape into solution. For singlet geminate radical pairs, the low field effect leads to a boost in the concentration of free radicals, which may be relevant in the context of in vivo biological effects of electromagnetic fields. Using analytical approaches in limiting cases, the maximum possible low field effects are calculated for a variety of radical pairs. Sizeable changes in reaction yields (∽20%) are found for almost any radical pair provided the spin-correlation persists long enough for significant evolution of the electron spins under the influence of the weak applied field. The conditions necessary for observing effects as large as ∽20% are discussed.

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Metadata

Authors
Timmel, C. R., Till, U., Brocklehurst, B., Mclauchlan, K. A., & Hore, P. J.
Venue
Molecular Physics
Publisher
Informa UK Limited
Published
1998-09
Volume
95
Issue
1
Pages
71-89
ISSN
  • 0026-8976 (ISSN-L)
  • 1362-3028
DOI
10.1080/00268979809483134
OpenAlex
W1990216398
Cited by
392
References
0
FWCI
4.23
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Effects of weak magnetic fields on free radical recombination reactions. https://app.cochat.ai/papers/10.1080/00268979809483134
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Timmel, C. R., Till, U., Brocklehurst, B., Mclauchlan, K. A., & Hore, P. J. (1998). Effects of weak magnetic fields on free radical recombination reactions. Molecular Physics. https://doi.org/10.1080/00268979809483134

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