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Several organic liquids have been studied using the muon spin rotation @.s.r.) technique. Radicals are seen in some of these compounds, formed by the addition of muonium (the muonic analogue of hydrogen) to an unsaturated molecule. Hyperfine interaction constants are calculated for the radicals and compared with those obtained for protonic radicals by other techniques. The magnitude of the diamagnetic fraction in the liquids is discussed.

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Implantation of positive muons in solutions of styrene in benzene creates free radicals which are observed and studied by the muon spin rotation O1.s.r.) technique. Muonium-substituted phenylethyl and cyclohexadienyl radicals are identified, and relative rate constants for their formation deduced from the concentration dependence of the p.s.r. amplitudes. There seems to be an indication from the phases of the phenylethyl signals that the precursor may be diamagnetic. Possible broadening mechanisms of the p . r . linewidths are surveyed and the means of distinguishing them through their different dependences on magnetic field, temperature and concentration are demonstrated. The linewidth of the muonic phenylethyl radical provides a direct measurement of the rate of dimerization in styrene.