The Radiolysis of Sulfur Dioxide and Hydrogen Sulfide in Water Ice: Implications for the Icy Jovian Satellites

Details The Radiolysis of Sulfur Dioxide and Hydrogen Sulfide in Water Ice: Implications for the Icy Jovian Satellites The Radiolysis of Sulfur Dioxide and Hydrogen Sulfide in Water Ice: Implications for the Icy Jovian Satellites

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusm.p21a..01m&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #P21A-01

Physics

6218 Jovian Satellites

Scientific paper

Spectra of Europa, Ganymede, and Callisto reveal surfaces dominated by frozen water (Calvin et al., 1995), hydrated materials (McCord et al., 1998b; Carlson et al., 1999), and minor amounts of SO2 (Lane et al., 1981; Noll et al., 1995), CO2 (Smythe et al., 1998), and H2O2 (Carlson et al., 1999). These icy moons undergo significant bombardment by jovian magnetospheric radiation (protons, electrons, and sulfur and oxygen ions) which alters their surface compositions. In order to understand these radiation-induced changes, we have measured the mid-infrared (IR) spectra of proton-irradiated H2O-ice mixtures containing SO2 or H2S. Samples with H2O/SO2 or H2O/H2S ratios of 3 and 30 have been irradiated at 86 K, 110 K, and 132 K, and the radiation half-lives of SO2 and H2S have been determined. New radiation products include H2S2, and ions (SO42- and HSO4-). During warming, we have identified the IR spectrum of both the tetrahydrate and monohydrate of sulfuric acid. In addition we have documented the dehydration of the monohydrate to form sulfuric acid near 250 K. A summary of these findings will be presented along with implications of similar processes affecting the outer icy shells of Europa, Ganymede, and Callisto.
691.gsfc.nasa.gov/cosmic.ice.lab

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