Muon level-crossing spectroscopy has been applied to the study of muonium-substituted radicals formed in liquid benzene, hexadeuterobenzene, furan, 2-metbylpropene, 2,3-dimethyl-2-butene, and gaseous ethene. The magnitudes and signs of the proton and deuteron hyperfine constants are reported, and ar
Thiyl radicals studied by muon level-crossing spectroscopy
β Scribed by Mary V. Barnabas; David C. Walker
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 369 KB
- Volume
- 168
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
β¦ Synopsis
Addition of muonium atoms to thiocarbonyl compounds is shown to result in the formation of sulfur-centered radicals (R-s; which are observed by level-crossing-resonance spectroscopy. This technique enables one to determine the proton and nitrogen hyperfine coupling constants in thiyl radicals: a task which cannot be accomplished directly be ESR. The radicals are formed here in dilute aqueous solution from muonium atoms produced by irradiation with positive muons.
π SIMILAR VOLUMES
Thiyl radicals (RS), formed by radiolysis of rigid solutions of a wide range of thiols at 77 K, are cha:acterised by parallel fearurcs with high g-values which are markedly solvent dependent. However, in methanol at 77 Kg,, = 2.158 in all cases and this can be taken as dianostic of RS radicals. Also
Analysis of the muon spin rotation (@R) data for the muonic ethyl radical CH,MucH, yields &hyperfine coupling constants in good agreement with the recent level-crossing resonance (LCR ) measurements. Other coupling constants are predicted and await confirmation by LCR. The role of hyperconjugation i