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Middle UV to near-IR spectrum of electron-excited SO2

Journal of Geophysical Research E: Planets

By:
, , , , , and
DOI:10.1029/2007JE002921

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Abstract

We investigated the electron impact–induced fluorescence spectrum of SO2 to provide excitation cross sections for modeling Io's emission 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 Å at a resolution of Δλ ∼ 2.5 Å full width at half maximum (FWHM). The VOIR laboratory spectrum longward of 6000 Å consists entirely of S I, II and O I, II multiplets for electron impact energies above ∼15 eV. Between 2000 and 6000 Å, 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 Å 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 Å. 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.

Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Middle UV to near-IR spectrum of electron-excited SO2
Series title:
Journal of Geophysical Research E: Planets
DOI:
10.1029/2007JE002921
Volume:
113
Issue:
3
Year Published:
2008
Language:
English
Publisher:
American Geophysical Union
Description:
E03002; 15 p.
Online Only (Y/N):
N
Additional Online Files (Y/N):
N