The ionic radical SO3-has been identified in T-irradiated single crystals of sodium dithionate, sulphamic acid, potassium sulphamate, potassium amine disulphonate and potassium methane disulphonate. The electron resonance spectrum is a single line with an isotropic g factor of 2"004. The principal values of the ~3S hyperfine coupling tensor are 428, 314 and 316 Mc/s, from which the percentages of 3s and 3p character of the unpaired electron orbital are obtained, enabling a value of 111 ~ for the O-S-O angle to be deduced. Ultra-violet transitions at 2700 A and 2400 ~, were found for SO3-. A value of 104 for the extinction coefficient of the 2400 ~ band was measured. A comparison of spin populations between the isoelectronic species PO3 =, SOaand CIO3 is included.

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The electron spin resonance spectra of the radical CH(SOs)2 = trapped in a single crystal of potassium methane disulphonate and of the isoelectronic radical N(SO3)2 = in the isostructural potassium amine disulphonate crystal are interpreted. The hyperfine couplings for H, 13C and 14N nuclei and the g-factors are given. The unpaired electron occupies a :r-orbital of predominantly central-atom 2p character in each case. The spin populations are derived. An unusual feature, prominent in the potassium methane disulphonate case, is the detection of resolved hyperfine coupling to hydrogen nuclei in the host molecules.

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