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Cosmic ray synthesis of organic molecules in Titan's atmosphere

Authors:	Louis A Capone John Dubach Robert C Whitten Sheo S Prasad Krishnamurthy Santhanam

Institution:	Department of Meteorology, San Jose State University, San Jose, California 95192, USA;Los Alamos Scientific Laboratory, Los Alamos, New Mexico 87545, USA;Space Science Division, Ames Research Center, NASA, Moffett Field, California 94035, USA;California Institute of Technology, Jet Propulsion Laboratory, Pasadena, California 91103, USA;Informatics, Inc., Palo Alto, California 94303, USA

Abstract:	We have studied the possible synthesis of organic molecules by the absorption of galactic cosmic rays in an N₂CH₄H₂ Titan model atmosphere. The cosmic-ray-induced ionization results in peak electron densities of 2 × 10³ cm^?3, with NH₄⁺, C₃H₉⁺, and C₄H₉⁺ being among the important positive ions. Details of the ion and neutral chemistry relevant to the production of organic molecules are discussed. The potential importance of $N (^{2} D)$ reactions with CH₄ and H₂ is also demonstrated. Although the integrated production rate of organic matter due to the absorption of the cosmic ray cascade is much less than that by solar ultraviolet radiation, the production of nitrogen-bearing organic molecules by cosmic rays may be greater.

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