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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Aromatic Formation Promoted by Ion-Driven Radical Pathways in EUV Photochemical Experiments Simulating Titan's Atmospheric Chemistry
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Aromatic Formation Promoted by Ion-Driven Radical Pathways in EUV Photochemical Experiments Simulating Titan's Atmospheric Chemistry

机译：EUV光化学实验中的离子驱动的自由基途径促进了芳香族形成，模拟泰坦的大气化学

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In the atmosphere of Titan, Saturn's main satellite, molecular growth is initiated by 85.6 nm extreme ultraviolet (EUV) photons triggering a chemistry with charged and free-radical species. However, the respective contribution of these species to the complexification of matter is far from being known. This work presents a chemical analysis in order to contribute to a better understanding of aromatic formation pathways. A gas mixture of N-2/CH4 (90/10%) within the closed SURFACAT reactor was irradiated at a relatively low pressure (0.1 mbar) and room temperature for 6 h by EUV photons (similar to 85.6 nm). The neutral molecules formed at the end of the irradiation were condensed in a cryogenic trap and analyzed by electron ionization mass spectrometry. An analysis of the dominant chemical pathways highlights the identification of benzene and toluene and underlies the importance of small ion and radical reactions. On the basis of the experimental results, a speculative mechanism based on sequential H-elimination/CH3-addition reactions is proposed for the growth of aromatics in Titan's atmosphere. Elementary reactions to be studied are given to instill future updates of photochemical models of Titan's atmosphere.
机译：在土星的主要卫星土卫六的大气层中，85.6纳米的极紫外（EUV）光子引发了一种带电和自由基物种的化学反应，从而引发了分子的生长。然而，这些物种对物质复杂化的各自贡献尚不清楚。这项工作提出了一个化学分析，以有助于更好地理解芳香族的形成途径。在相对较低的压力（0.1毫巴）和室温下，用EUV光子（类似于85.6纳米）对封闭表面反应器内的N-2/CH4气体混合物（90/10%）进行6小时的辐照。辐射结束时形成的中性分子在低温阱中冷凝，并通过电子电离质谱进行分析。对主要化学途径的分析强调了苯和甲苯的识别，并强调了小离子和自由基反应的重要性。在实验结果的基础上，提出了一种基于连续H-消除/CH3加成反应的推测机制，用于在Titan大气中生长芳烃。将要研究的基本反应将为未来泰坦大气光化学模型的更新提供依据。

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