The mass-spectrograph previously described has been used to study ionization by electron impact in SO₂. SO₂⁺ ions appear at 13.1±{}0.3 volts, SO⁺ ions at 16.5±{}0.5 and ions of mass 32, either S⁺ or O₂⁺ appear at 16.0±{}0.7 and increase sharply at 22.3±{}1.0. No O⁺ ions are observed. The probable processes of formation of these ions are discussed.
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Smyth et al. (1933) studied this question.