Applied Magnetic Resonance

, Volume 13, Issue 1–2, pp 181–194 | Cite as

Hyperfine coupling constants of muonium-substituted cyclohexadienyl radicals in the gas phase: C6H6Mu, C6D6Mu, C6F6Mu

  • D. G. Fleming
  • D. J. Arseneau
  • J. (Jun) Pan
  • M. Y. Shelley
  • M. Senba
  • P. W. Percival


Muon spin rotation (μSR) and avoided level crossing resonance (ALCR) have been used to determine the hyperfine coupling constants (hfcs) of the muonium-substituted cyclohexadienyl radicals C6H6Mu, C6D6Mu and C6F6Mu in the gas phase, at pressures ∼1 and 15 atm and temperatures in the range 40–80°C. Equivalent studies of polyatomic free radicals in gases, by electron spin resonance (ESR) spectroscopy, are generally not possible in this pressure range. The present gas phase results support the findings of earlier studies of cyclohexadienyl radicals in the condensed phase, by both μSR and ESR. Minor but not insignificant (∼1%) effects on the hfcs are observed, which can be qualitatively understood for such nonpolar media in terms of their differing polarizabilities. This is the first time that comparisons of this nature have been possible between different phases at the same temperatures. These μSR/ALCR gas-phase results provide a valuable benchmark for computational studies on radicals, free from possible effects of solvent or matrix environments.


Electron Spin Resonance Electron Spin Resonance Study Hyperfine Coupling Constant Electron Spin Resonance Data Nonpolar Medium 
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Copyright information

© Springer 1997

Authors and Affiliations

  • D. G. Fleming
    • 1
  • D. J. Arseneau
    • 1
  • J. (Jun) Pan
    • 1
  • M. Y. Shelley
    • 1
  • M. Senba
    • 1
  • P. W. Percival
    • 2
  1. 1.TRIUMF and Department of ChemistryUniversity of British ColumbiaVancouverCanada
  2. 2.TRIUMF and Department of ChemistrySimon Fraser UniversityBurnabyCanada

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