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An interpretation of the near-ultraviolet absorption spectrum of SO2 - Implications for Venus, Io, and laboratory measurementsLine characteristics of remotely sensed SO2 spectra near the UV are discussed, noting the implications for the interpretation of data gathered by the IUE of Io and ground-based and Pioneer spectra of Venus. It is shown that the ratio of mean line spacing to linewidth is greater than unity, and that fully resolved lines have features consistent with concepts of temperature and pressure broadening. The application of Beer's approximation for the absorption spectra of Venus and Io atmospheres is found to be incorrect. Further, the spectroscopic limit on the SO2 line data from Io observations by the IUE are interpreted as establishing a lower bound on the SO2 in the Io atmosphere. A greater concentration of SO2 in vapor equilibrium may be present in the lower atmosphere. Laboratory measurements to resolve the uncertainties regarding the UV spectroscopic data from Io and Venus are suggested.
Document ID
19830035748
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Belton, M. J. S.
(Kitt Peak National Observatory Tucson, AZ, United States)
Date Acquired
August 11, 2013
Publication Date
October 1, 1982
Publication Information
Publication: Icarus
Volume: 52
Subject Category
Lunar And Planetary Exploration
Accession Number
83A16966
Funding Number(s)
CONTRACT_GRANT: NASA ORDER S-71086-B
Distribution Limits
Public
Copyright
Other

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