Biology
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.5405p&link_type=abstract
American Astronomical Society, DPS meeting #40, #54.05; Bulletin of the American Astronomical Society, Vol. 40, p.496
Biology
1
Scientific paper
Carbonic acid (H2CO3) is a major product of energetically processed ices containing H2O and CO2. It is thermally stable at 200 K, higher than the sublimation temperature of H2O. Ices containing both H2O and CO2 have been found on a variety of surfaces such as those of Europa, Callisto, Iapetus, and Mars, where processing by magnetospheric ions or the solar wind may lead to the formation of H2CO3. We have investigated the stability of carbonic acid at 14 K, 100 K, and 200 K upon irradiation with 0.8 MeV protons. The energy deposited into the ice by the incident proton beam not only destroys H2CO3, but also amorphizes the crystalline phase of the solid. The radiation destruction and amorphization processes will be discussed along with an estimate for the expected lifetimes of H2CO3 on the surfaces of different solar system bodies.
This research is funded through NASA's Mars Fundamental Research Program and the Goddard Center for Astrobiology.
Hudson Rachel
Moore Marilyn
Peeters Zan
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