The Other Chemistry of Icy Moons - Low Energy and Sulfurous

Details The Other Chemistry of Icy Moons - Low Energy and Sulfurous The Other Chemistry of Icy Moons - Low Energy and Sulfurous

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.6406h&link_type=abstract

American Astronomical Society, DPS meeting #38, #64.06; Bulletin of the American Astronomical Society, Vol. 38, p.613

Physics

Geophysics

Scientific paper

Spectra of Jupiter's icy satellites reveal surfaces dominated by H2O-ice with minor amounts of SO2 and other materials. The co-existence of H2O and SO2 in surfaces exposed to jovian radiation suggests that H2SO4 also should be present. This was noted by Carlson et al. (1999) who supported this suggestion with assignments of near-IR bands in Europa spectra to hydrated H2SO4. Laboratory experiments have since demonstrated radiolytically-driven syntheses in S- and SO2-containing H2O-ices (Carlson et al., 2002; Moore et al., 2006).
In the Cosmic Ice Laboratory, we recently have investigated the thermal chemistry of SO2 trapped in H2O-ice. IR spectra of H2O + SO2 mixtures recorded at 10 to 230 K were used to follow low-temperature reactions in the absence of radiation effects. No SO2 reactions were found at 10 K, but warming to more-relevant Europa temperatures produced HSO3- and S2O52-. Added NH3 shifted the product composition toward SO32- and away from the other ions. Details of this work, and implications for Europa chemistry and astrobiology, will be presented.
This research is supported through NASA's Planetary Atmospheres and Planetary Geology and Geophysics programs, as well as the NASA Astrobiology Institute's Goddard Center for Astrobiology.
References:
Carlson, R. W., Johnson, R. E., Anderson. M. S., 1999, Science 286, 97-99.
Carlson, R. W., Anderson, M. S., Johnson, R. E., Schulman, M. B., Yavrouian, A. H., 2002, Icarus 157, 456-463.
Moore, M. H., Hudson, R. L., Carlson, R. W., 2006, Icarus (submitted).

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