High resolution photoabsorption cross section measurements of SO2 at 295 K between 220 and 328 nm

Details High resolution photoabsorption cross section measurements of SO2 at 295 K between 220 and 328 nm High resolution photoabsorption cross section measurements of SO2 at 295 K between 220 and 328 nm

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001dps....33.5607s&link_type=abstract

American Astronomical Society, DPS Meeting #33, #56.07; Bulletin of the American Astronomical Society, Vol. 33, p.1142

Astronomy and Astrophysics

Astronomy

Scientific paper

Analysis of the UV spectrum of Io and modelling of the chemical composition of, and photochemical processes in, its atmosphere require knowledge of the photoabsorption cross section of SO2 over a wide wavelength range at temperatures from 110 to ~500 K. Our laboratory program, which employs an ultraviolet Fourier transform spectrometer at Imperial College, London, provides such data at very high resolution. Previous photoabsorption measurements at these wavelengths have been unable to resolve the very congested SO2 spectrum. We report new cross section data for SO2 at 295 K for wavelengths between 220 and 328 nm at resolving powers, λ /Δ λ , from 90,000 to 550,000. The new work complements our earlier cross section data for SO2 at room temperature in the 190 to 220 nm wavelength region [Stark et al., JGR Planets 104, 16,585 (1999)]. Current effort is focussed on analysis of similar data over the wavelength range 190 to 220 nm for SO2 cooled to 160 K. This work was supported in part by NASA Grant NAG5-9059.

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