Laboratory studies on the formation of CN containing molecules in the atmosphere of Titan and prebiotic Earth

Details Laboratory studies on the formation of CN containing molecules in the atmosphere of Titan and prebiotic Earth Laboratory studies on the formation of CN containing molecules in the atmosphere of Titan and prebiotic Earth

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.496..159b&link_type=abstract

In: Exo-/astro-biology. Proceedings of the First European Workshop, 21 - 23 May 2001, ESRIN, Frascati, Italy. Eds.: P. Ehrenfreu

Biology

Titan Atmosphere, Laboratory Simulations, Biochemistry

Scientific paper

The reactions of excited nitrogen atoms, N(2D), with methane, ethene and ethyne, have been studied under single collision conditions in order to identify possible reaction products. In all cases, the nitrogen/hydrogen exchange channel was found to be a significant reaction pathway, leading to nitrogen containing molecules or radicals. The present laboratory studies are helpful in modeling the chemistry of the upper atmosphere of Titan, since they confirm that reactions of N(2D) are effective in generating new C-N bonds and therefore represent potential first steps towards the formation of nitriles. Relevant to the organic chemistry of Titan atmosphere are the following finds: 1) CH2NH is the main reaction product from the reaction N(2D)+CH4; 2) the products of formula C2H3N generated by the N(2D)+C2H4 reaction are formed with enough internal energy to easily rearrange to the most stable isomer CH3CN; 3) the main product from N(2D)+C2H2 reaction is HCCN. We recall that both CH2NH and CH3CN have been observed in the atmosphere of Titan, while the HCCN radical has been suggested to be a key intermediate towards C2N2/C2N4 formation.

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