Laboratory Investigations of Jupiter's Chromophores

Details Laboratory Investigations of Jupiter's Chromophores Laboratory Investigations of Jupiter's Chromophores

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.3904c&link_type=abstract

American Astronomical Society, DPS meeting #41, #39.04

Astronomy and Astrophysics

Astronomy

Scientific paper

Ultraviolet- irradiated ammonium hydrosulfide (NH4SH) ice and its byproducts have long been postulated to be the source of the reddish coloring of the Great Red Spot (e,g., Lewis and Prinn (1970), West et al., 1986, Baines et al., 2004). NH4SH aerosols created near the 2.5-bar level on Jupiter may be transported upward to the 300-mbar level in the anti-cylonic environment of the Great Red Spot, where they are then subjected to solar ultraviolet irradiation. The irradiated ices and byproducts could be concentrated by the vortex action of the GRS, enhancing the reddish color above that which would be seen by an irradiated NH4SH cloud in the typical zone/belt structure of Jupiter. We have initiated an experimental study of potential sulfurous chromophores using a photolysis flow cell with temperatures and pressures controlled to simulate Jovian conditions. Photolysis is produced using Hg, Zn, or D2 lamps, each with different spectral characteristics. Analysis of the photoproducts is performed using ultraviolet, visible, and infrared spectroscopy and the gaseous and sublimed products are also characterized using mass spectroscopy. Our first experiments have been with NH4SH condensed from mixtures of NH3 and H2S at 240 K. The irradiated condensate exhibits broad ultraviolet and visible features that may be attributed to absorptions by polysulfide ions (SnS2-) in ammonium polysulfide [(NH4+)2 SnS2-] and possibly to absorptions by hydropolysulfide ions (HSnS-). The measurements and comparisons to Jovian spectra will be presented.

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