On the Formation of Cometary Carbon Disulfide (CS2)

Details On the Formation of Cometary Carbon Disulfide (CS2) On the Formation of Cometary Carbon Disulfide (CS2)

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.2309h&link_type=abstract

American Astronomical Society, DPS meeting #41, #23.09

Physics

Geophysics

Scientific paper

The formation of cometary CS molecules from carbon disulfide, CS2, was proposed about 20 years before the latter's detection in comet 122P/de Vico by Jackson et al. (2002). However, the origin of CS2 has received little attention from either experimentalists or theorists. As part of our on-going laboratory program to investigate cometary molecules we have examined chemical reactions that lead to CS2 in the solid state. Icy mixtures of known cometary molecules were proton irradiated near 10 K to doses of several eV per molecule. Mid-IR spectroscopy was used as an in situ probe to record both CS2 formation in the ices and the destruction of precursors. We find that the most likely route to cometary CS2 is through OCS by way of the S + CO reaction. - This work was funded by NASA's Planetary Geology and Geophysics and Planetary Atmospheres programs.

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