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Middle UV to Near-IR Spectrum of Electron-Excited SO2We investigated the electron impact-induced fluorescence spectrum of SO2 to provide excitation cross sections for modeling Io's mission spectrum and analyzing Cassini Imaging Science Subsystem observations. The electron-excited middle-ultraviolet visible optical near-infrared (VOIR) emission spectrum of SO2 gas was generated in the laboratory and studied from 2000 to 11,000 A at a resolution of (Delta)(lamda) approximately 2.5 A full width at half maximum (FWHM). The VOIR laboratory spectrum longward of 6000 A consists entirely of S I, II and O I, II multiplets for electron impact energies above approximately 15 eV. Between 2000 and 6000 A, we find previously identified molecular bands from both SO and SO2. This work represents a significant improvement in spectral resolution over our earlier work done at 18 A FWHM. From a measurement of the medium-resolution spectrum, we provide detailed 25- and 100-eV emission cross sections for spectral features from 2000 to 11,000 A . On the basis of these data, we suggest future ground-based and satellite telescopic observations in the VOIR that are of promise for understanding Io's atmosphere.
Document ID
20080036101
Acquisition Source
Jet Propulsion Laboratory
Document Type
Preprint (Draft being sent to journal)
Authors
Ajello, Joseph M.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Aguilar, Alejandro
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Mangina, Rao S.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
James, Geoffrey K.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Geissler, Paul
(Geological Survey Flagstaff, AZ, United States)
Trafton, Laurence
(Texas Univ. Austin, TX, United States)
Date Acquired
August 24, 2013
Publication Date
March 21, 2008
Publication Information
Publication: Journal of Geophysical Research
Publisher: American Geophysical Union
Volume: 113
Subject Category
Lunar And Planetary Science And Exploration
Funding Number(s)
CONTRACT_GRANT: NNG04G131G
Distribution Limits
Public
Copyright
Other
Keywords
sulpher dioxide
Cassini Imaging Science
electron impact induced fluorescence spectrum

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