Photodestruction of ions containing sulfur dioxide

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Abstract
Photodestruction cross sections have been measured for six ions containing SO2 over the photon energy range 1.55–3.5 eV using a drift tube mass spectrometer and rare gas ion and dye lasers. The cross section for SO2− increases smoothly with photon energy from (0.9 to 2.4) ×10−18 cm2. The photodestruction spectra of SO2 (SO2)− and O2 (SO2)+ consist of broad, structureless bands. These bands are attributed to direct dissociation through repulsive excited states. Cross section for O2 (SO2)−, NO2 (SO2)−, and NO3 (SO2)− are measurably different from zero only at the upper end of the photon energy range.