Boreskov

PP‐7CHROMATO‐MASS‐SPECTROMETRIC ANALYSIS OF ORGANICS WHICH AREPRODUCED DURING SIMULATED HYPERVEVOCITY IMPACTS ON TITANGerasimov M.V., Zaitsev M.A., Safonova E.N.Space Research Institute of Russian Academy of Science,Russia, 117997 Moscow, Profsoyuznaya str. 84/32Prebiotic synthesis of organic compounds at natural conditions is interesting for theproblem of origin of life. The possibility of prebiotic synthesis and complexity of its productsis defined by large number of physicochemical conditions in the system such as density andcomposition of atmosphere, presence of water, source of free energy etc.The formation of organic compounds (OC) was studied by simulation of hypervelocityimpact chemistry in the atmosphere, which simulates qualitative composition of theatmosphere of Titan. The impact vaporization was simulated by evaporation of peridotitesample by a specific laser pulse with total energy of about 600 J in gaseous medium underatmospheric pressure. The gaseous medium consists of clean methane or nitrogen andmixtures of methane with nitrogen of the volume ratios 1:1 and 1:9. Experiments werecarried out in clean hermetic camera with the optical window of quartz glass.Formation of significant number of volatile and high‐molecular compounds (kerogens)was measured during hypervelocity impact simulation experiments in reducing atmosphere.OC in this case were mainly presented by the polycyclic aromatic hydrocarbons (PAH).Oxygen‐containing OC were also present: carbonyl compounds and the unsaturated fattyacids.PAH and kerogens are the most stable compounds at high temperature in the presenceof various forms of chemically active oxygen, which is produced in impact vapor plums dueto dissociation of petrogenic oxides. With decrease of the reducing nature of theatmosphere the variety and the amount of OC substantially decreases. It was impossible toreveal detectable quantities of OC (1 ppm) in experiments in pure nitrogen atmosphere.It is possible to expect formation of some important prebiotic OC at Titan’s conditionsdue to hypervelocity impacts.142