Laboratory measurements of photoabsorption cross sections of SO_2 between 190 and 220 nm.

Details Laboratory measurements of photoabsorption cross sections of SO_2 between 190 and 220 nm. Laboratory measurements of photoabsorption cross sections of SO_2 between 190 and 220 nm.

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997dps....29.0913s&link_type=abstract

American Astronomical Society, DPS meeting #29, #09.13; Bulletin of the American Astronomical Society, Vol. 29, p.980

Astronomy and Astrophysics

Astronomy

Scientific paper

Determination of the chemical composition of the atmosphere of Io from Hubble Space Telescope observations in the 190-220 nm wavelength region requires knowledge of the photoabsorption cross sections of SO_2 at temperatures ranging from 110 to 300 K. We have initiated a laboratory program to measure SO_2 absorption cross sections with very high resolving power (lambda /delta lambda =~ 500,000) and at temperatures appropriate to the Io atmosphere. Previous photoabsorption measurements, with lambda /delta lambda <= 100,000, have been unable to fully resolve the very congested SO_2 spectrum. Our measurements are being undertaken at Imperial College, London, using an ultraviolet Fourier transform spectrometer (Thorne et al. 1987. J. Phys. E 20, 54). We present new room temperature SO_2 photoabsorption cross sections in the 190-220 nm region measured with an instrumental resolution of 0.0004 nm. These high-resolution cross sections are compared to previous, lower-resolution, data. This work is supported by NASA Grant NAGW-5200.

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