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Torsional frequencies have been assigned in the far infra-red and Raman spectra of C2H5C1, CH3. CHC12, CHzCl . CHzCI, CHCl2CH2C1, CH2Cl. Cc13, C H C l z . CHC12 and CHc12. CCl3. Barrier heights have been calculated for the symmetric top molecules ; V3 ranges from 3.3 to 14-2 kcalmole-1. The problem of estimating barriers in asymmetric top molecules is more difficult. Nevertheless, for these molecules, barrier heights ranging from 5.1 to 12-0 kcal mole-1 have been calculated, which are comparable in magnitude to those obtained for the symmetric top molecules. * We thank I.C.I. Fibres Ltd., Harrogate, for the use of this spectrometer.

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.