Gas-Phase prebiotic chemistry on titan: specific laboratory kinetic measurements on the formation rates and mechanisms for molecular anions observed by the Cassini mission.

Details Gas-Phase prebiotic chemistry on titan: specific laboratory kinetic measurements on the formation rates and mechanisms for molecular anions observed by the Cassini mission. Gas-Phase prebiotic chemistry on titan: specific laboratory kinetic measurements on the formation rates and mechanisms for molecular anions observed by the Cassini mission.

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ttt..work...79a&link_type=abstract

Through Time; A Workshop On Titan's Past, Present and Future, NASA Goddard Space Flight Center, April 6th - 8th, 2010. Edited b

Computer Science

Scientific paper

The discovery of heavy (up to 10,000 amu/q) negative ions in Titan's upper atmosphere at altitudes above 950 Km is one of the highly unexpected results from the Cassini Mission. The elements of negative ion chemistry of organic macromolecular growth in Titan's upper atmosphere may ultimately tell us the abiotic synthesis of complex prebiotic compounds in the primordial atmosphere of Earth. The ionospheric chemistry model attributes the three low mass negative ion peaks observed by the Cassini CAPS Electron Spectrometer to CN-, C3N-/C4H-, and C5N-/C6H- based on the identification of reactions of negative ions. These low mass anions are considered to be the first intermediates in the growth of higher mass anions which are currently presumed to be the precursors to the aerosols observed at lower altitudes. The stoichiometry, composition and structure of heavy anions containing hydrocarbons and nitriles are largely unknown. It may be possible that their structure could be long chains, organic ring compounds and fullerenes. In my talk I will deal with electron attachment and kinetics for small and heavy C, N, H bearing anions and will take an attempt to identification of chemical reaction pathways that may lead to specific structures of heavy negative ions. The data from experiments on the kinetics of combustion reactions are not applicable to the cold, reducing and nitrogen rich environment of Titan. I will describe the limitations of combustion experiments, and how we have been able to overcome at present from experimental studies of the kinetics of closely related electron attachment processes at temperatures down to 10K using the CRESU (Cinetique de Reaction en Ecoulement Supersonique Uniforme, i.e., reaction kinetics in a uniform supersonic flow) technique. Future laboratory experiments on the electron and anion attachment kinetics on specific target systems using the CRESU technique will be proposed in order to make a link between CAPS-ELS observation of molecular anions and chemical modeling of negative ion chemistry in Titan's upper atmosphere. These experiments are also preparatory to observations designed to identify the future mission to outer planets to understand the prebiotic chemistry.

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