Identification of gaseous SO2 and new upper limits for other gases on Io

@article{Pearl1979IdentificationOG,
  title={Identification of gaseous SO2 and new upper limits for other gases on Io},
  author={John Christopher Pearl and Rudolf A. Hanel and Virgil G. Kunde and William C. Maguire and Karl August Fox and Satya Kumar Gupta and Cyril Ponnamperuma and François Raulin},
  journal={Nature},
  year={1979},
  volume={280},
  pages={755-758}
}
Gaseous SO2 has been identified on Io. The estimated abundance of 0.2 cm atm is consistent with an atmosphere in equilibrium with solid SO2 at the local surface equilibrium temperature. Preliminary upper limits for several gases, including sulphur compounds and other terrestrial volcanic emissions have been derived. Io is apparently depleted in hydrogen, carbon and nitrogen. 
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