Growth Processes of the Organic Matter in Titan Upper Atmosphere

Details Growth Processes of the Organic Matter in Titan Upper Atmosphere Growth Processes of the Organic Matter in Titan Upper Atmosphere

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.2001c&link_type=abstract

American Astronomical Society, DPS meeting #40, #20.01; Bulletin of the American Astronomical Society, Vol. 40, p.421

Astronomy and Astrophysics

Astronomy

Scientific paper

The recent data collected by the Cassini ion neutral mass spectrometer and the plasma spectrometer revealed an intense chemical activity leading to the formation of large positive and negative ions, and to the production of particles in Titan upper atmosphere.
Chemical models of Titan's ionosphere, presently involving hundreds of reactions, are far not enough to explain molecular growth but the large number of reactions included in the present models makes difficult to understand the efficient reactions arising in Titan ionosphere and their interactions.
In order to better understand the most efficient pathways, and finally give some clues to infer important missing reactions for the heavier species, we used mechanism reduction methods. It allowed us to determine the skeletal mechanism for the well-known reactivity of small ions by eliminating the "unimportant” reactions, "unimportant” meaning here useless to reproduce the simulated ion mass spectrum within its error bars.
Moreover we produced "tholins” in a N2-CH4 gas mixture using a Capacitively Coupled Plasma under a variety of operating plasma conditions: CH4 percentage (0.5 to 10%), pressure (0.3 to 3.5 mbar) and gas flow rate (10 to 55 sccm). The analysis by FTIR spectroscopy, elemental composition and high resolution mass spectrometry highlighted different N insertion processes in the solid particles.

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