The complete UV spectrum of SO2 and electron impact. II - The middle ultraviolet spectrum

Details The complete UV spectrum of SO2 and electron impact. II - The middle ultraviolet spectrum The complete UV spectrum of SO2 and electron impact. II - The middle ultraviolet spectrum

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9710501a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A7, July 1, 1992, p. 10,501-10,512. Research sponsored by USAF.

Physics

20

Electron Impact, Fluorescence, Io, Spectral Bands, Sulfur Dioxides, Ultraviolet Spectra, Atomic Energy Levels, Electron Energy, Electron States, Electron Transitions, Molecular Energy Levels, Planetary Atmospheres, Voyager 2 Spacecraft

Scientific paper

Measurements of the middle ultraviolet (MUV) electron impact induced fluorescence spectrum of SO2 from 200 to 430 nm in a crossed beam experiment are reported. The spectrum is dominated by two features at the experimental resolution of 0.5 nm; these two features are referred to as MUV1 and MUV2. MUV1 is the SO band system extending from 240 to 265 nm produced by dissociative excitation. MUV2 is a blend of the SO2 and SO2(+) molecular band systems in the range 264-430 nm. The excitation function measurements of MUV2 indicate that low-energy electrons effectively prepare SO2 in one or more electronically excited triplet states that involve the SO2 state by direct excitation and/or cascading. The peak cross section for MUV1 occurs at 20 eV with a value of 25.0 +/-5.5 x 10 exp -19 sq cm. The peak cross section for MUV2 arises at 9 eV with a value of 368 +/-81 x 10 exp -19 sq cm. The laboratory results provide a plausible explanation of the Io auroral hot spots observed by Voyager 2.

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