Initiation of Hydrocarbon and Nitrile Chemistry in the Upper Atmospheres and Ionospheres of Titan and the Giant Planets

Details Initiation of Hydrocarbon and Nitrile Chemistry in the Upper Atmospheres and Ionospheres of Titan and the Giant Planets Initiation of Hydrocarbon and Nitrile Chemistry in the Upper Atmospheres and Ionospheres of Titan and the Giant Planets

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.3106h&link_type=abstract

American Astronomical Society, DPS meeting #40, #31.06; Bulletin of the American Astronomical Society, Vol. 40, p.447

Astronomy and Astrophysics

Astronomy

Scientific paper

Excitation, ionization, and fragmentation of methane initiate the creation and evolution of the complex mixtures of hydrocarbons and nitriles in the upper atmospheres and ionospheres of Titan and the giant planets. Key initial processes are photoabsorption, photodissociation, photoionization by solar ultraviolet radiation, as well as ion-molecule reactions with atomic and molecular nitrogen and hydrogen ions. The overall cross sections and rates for these reactions are relatively well known, but much less well constrained are the product branching fractions, and especially their temperature dependence. Here we will present a critical evaluation of the available information. Perhaps the most important conclusion is that the distribution of products in ion-molecule reactions of atomic hydrogen and nitrogen shows a strong dependence on collision energy [Dheandhanoo et al. PSS 32, 1301 (1984)]. Lower energies or temperatures favor higher yields of products that require more complicated chemical rearrangements.

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