Abstract
Unattenuated ionization rates for the dissociative photoionization of SO2 producing SO2+, SO+, S+, O+, and O2+ ions are reported during solar minimum and maximum conditions. It is found that in the atmosphere of Io the photo‐dissociation‐ionization of SO2 could be an important source of the production of SO+, S+, O+, and O2+ ions and that its contribution is much greater (factor of 5–10) compared with that due to direct photoionization of, respectively, SO, S, O, and O2 gases. Role of photoelectron impact ionization of SO2 in producing SO2+, SO+, S+, O+, and O2+ ions in the Io's atmosphere is investigated using a Monte Carlo model. It is recommended that the models of Io's ionosphere‐atmosphere should include the dissociative ionization of SO2.
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