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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Infrared Spectra of C2H6, C2H4, C2H2, and CO2 Aerosols Potentially Formed in Titan’s Atmosphere
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Infrared Spectra of C2H6, C2H4, C2H2, and CO2 Aerosols Potentially Formed in Titan’s Atmosphere

机译：泰坦大气中可能形成的C2H6，C2H4，C2H2和CO2气溶胶的红外光谱

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摘要

Pure and mixed aerosols of ethane, ethylene, acetylene and carbon dioxide were generated in a collisional cooling cell and characterized by Fourier transform infrared spectroscopy between 600 and 4000 cm-1. Pure ethane, pure ethylene, and mixed ethane/ethylene initially form supercooled liquid droplets, which over time crystallize to their stable solid phases. These droplets are found to be long-lived (up to hours) for pure ethane and mixed ethane/ethylene, but short-lived (up to seconds) for pure ethylene. Acetylene and carbon dioxide form solid aerosol particles. Acetylene particles have a partially amorphous structure, while carbon dioxide particles are crystalline. The structure of the infrared bands of carbon dioxide is strongly determined by the particles’ shape due to exciton coupling. The comparison of various mixed systems reveals that acetylene very efficiently induces heterogeneous crystallization. As reported earlier, the co-condensation of acetylene and carbon dioxide can lead to the formation of a metastable mixed crystalline phase. Our preliminary calculations show that this mixed phase has a monoclinic rather than the cubic structure proposed previously.
机译：在碰撞冷却池中生成乙烷，乙烯，乙炔和二氧化碳的纯气溶胶和混合气溶胶，并通过傅立叶变换红外光谱在600至4000 cm-1之间进行表征。纯乙烷，纯乙烯和乙烷/乙烯混合气最初形成过冷液滴，随着时间的流逝，它们会结晶成稳定的固相。发现这些液滴对于纯乙烷和乙烷/乙烯混合气来说寿命长（长达数小时），而对于纯乙烯来说则是短寿命（长达数秒）。乙炔和二氧化碳形成固体气溶胶颗粒。乙炔颗粒具有部分无定形的结构，而二氧化碳颗粒是结晶的。二氧化碳的红外波段的结构在很大程度上取决于激子耦合引起的粒子形状。各种混合系统的比较表明，乙炔非常有效地诱导了异质结晶。如前所述，乙炔和二氧化碳的共缩合可导致亚稳态混合结晶相的形成。我们的初步计算表明，这种混合相具有单斜晶而不是先前提出的立方结构。

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