The radical ions SO4− and S2O3−, trapped in γ‐irradiated K2SO4 and Na2S2O3·5H2O crystals, respectively, have been identified by their ESR spectra. In the preceding paper molecular orbital calculations were described the results of which predict a ···1t163t262a1, 2A1 (symmetry Td) configuration for SO4− and a ···5e45a1, 2A1 (symmetry C3v) configuration for S2O3−. The ESR data show that in the K2SO4 crystal the symmetry of SO4− is no higher than C2v and so correlation with the predicted configuration was inconclusive. In the case of S2O3−, however, the spectral parameters possessed axial symmetry, the ···e4a1, 2A1 configuration being confirmed by the nature of the hyperfine and g tensors.
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1966
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