The Influence of CO₂ Admixtures on the Product Composition in a Nitrogen-Methane Atmospheric Glow Discharge Used as a Prebiotic Atmosphere Mimic

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• 作者：V. Mazankova ; L. Torokova ; F. Krcma…
• 关键词：Prebiotic atmosphere ; Atmospheric glow discharge ; FTIR spectroscopy
• 刊名：Origins of Life and Evolution of Biospheres
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：46
• 期：4
• 页码：499-506
• 全文大小：759 KB
• 刊物主题：Life Sciences, general; Astrophysics and Astroparticles; Earth Sciences, general; Astronomy, Observations and Techniques; Biochemistry, general;
• 出版者：Springer Netherlands
• ISSN：1573-0875
• 卷排序：46

文摘

This work extends our previous experimental studies of the chemistry of Titan’s atmosphere by atmospheric glow discharge. The Titan’s atmosphere seems to be similarly to early Earth atmospheric composition. The exploration of Titan atmosphere was initiated by the exciting results of the Cassini-Huygens mission and obtained results increased the interest about prebiotic atmospheres. Present work is devoted to the role of CO₂ in the prebiotic atmosphere chemistry. Most of the laboratory studies of such atmosphere were focused on the chemistry of N₂ + CH₄ mixtures. The present work is devoted to the study of the oxygenated volatile species in prebiotic atmosphere, specifically CO₂ reactivity. CO₂ was introduced to the standard N₂ + CH₄ mixture at different mixing ratio up to 5 % CH₄ and 3 % CO₂. The reaction products were characterized by FTIR spectroscopy. This work shows that CO₂ modifies the composition of the gas phase with the detection of oxygenated compounds: CO and others oxides. There is a strong influence of CO₂ on increasing concentration other products as cyanide (HCN) and ammonia (NH₃).