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Radiofrequency polarization effects in low-field electron paramagnetic resonance.

Authors
  • Wedge, C J
  • Rodgers, Christopher T
  • Norman, Stuart A
  • Baker, Neville
  • Maeda, Kiminori
  • Henbest, Kevin B
  • Timmel, C R
  • Hore, P J
Type
Published Article
Journal
Physical chemistry chemical physics : PCCP
Publication Date
Aug 21, 2009
Volume
11
Issue
31
Pages
6573–6579
Identifiers
DOI: 10.1039/b907915g
PMID: 19639132
Source
Medline
License
Unknown

Abstract

Low-field optically detected EPR spectra of photochemically formed transient radical ion pairs are reported for weak circularly and linearly polarized radiofrequency (RF) fields. The spectra are found to be strongly dependent on the polarization and frequency of the RF field and on the angle between the static magnetic field and the plane containing the RF field. The spectra are discussed in terms of resonances arising from Zeeman and hyperfine interactions; the conditions for validity of the rotating frame approximation are determined. Knowledge of the latter is important when using low-field EPR as a diagnostic test for the operation of the radical pair mechanism.

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