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Spin-locking in low-frequency reaction yield detected magnetic resonance
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Wedge, Christopher, Lau, Jason C. S., Ferguson, Kelly-Anne, Norman, Stuart A., Hore, P. J. and Timmel, C. R. (Christiane R.) (2013) Spin-locking in low-frequency reaction yield detected magnetic resonance. Physical Chemistry Chemical Physics, Volume 15 (Number 38). pp. 16043-16053. doi:10.1039/c3cp52019f ISSN 1463-9076.
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Official URL: http://dx.doi.org/10.1039/c3cp52019f
Abstract
The purported effects of weak magnetic fields on various biological systems from animal magnetoreception to human health have generated widespread interest and sparked much controversy in the past decade. To date the only well established mechanism by which the rates and yields of chemical reactions are known to be influenced by magnetic fields is the radical pair mechanism, based on the spin-dependent reactivity of radical pairs. A diagnostic test for the operation of the radical pair mechanism was proposed by Henbest et al. [J. Am. Chem. Soc., 2004, 126, 8102] based on the combined effects of weak static magnetic fields and radiofrequency oscillating fields in a reaction yield detected magnetic resonance experiment. Here we investigate the effects on radical pair reactions of applying relatively strong oscillating fields, both parallel and perpendicular to the static field. We demonstrate the importance of understanding the effect of the strength of the radiofrequency oscillating field; our experiments demonstrate that there is an optimal oscillating field strength above which the observed signal decreases in intensity and eventually inverts. We establish the correlation between the onset of this effect and the hyperfine structure of the radicals involved, and identify the existence of ‘overtone’ type features appearing at multiples of the expected resonance field position.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry Q Science > QP Physiology |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Library of Congress Subject Headings (LCSH): | Animal magnetism, Bioelectromagnetism, Magnetic fields -- Physiological effect, Human body -- Magnetic fields | ||||||||
Journal or Publication Title: | Physical Chemistry Chemical Physics | ||||||||
Publisher: | Royal Society of Chemistry | ||||||||
ISSN: | 1463-9076 | ||||||||
Official Date: | 6 August 2013 | ||||||||
Dates: |
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Volume: | Volume 15 | ||||||||
Number: | Number 38 | ||||||||
Number of Pages: | 11 | ||||||||
Page Range: | pp. 16043-16053 | ||||||||
DOI: | 10.1039/c3cp52019f | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 28 December 2015 | ||||||||
Date of first compliant Open Access: | 28 December 2015 | ||||||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC), EMF Biological Research Trust, United States. Defense Advanced Research Projects Agency (DARPA) | ||||||||
Grant number: | N66001-10-1-4061 (DARPA) |
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