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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Laboratory Studies of Molecular Growth in the Titan Ionosphere
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Laboratory Studies of Molecular Growth in the Titan Ionosphere

机译：泰坦电离层分子生长的实验室研究

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摘要

Experimental simulations of the initial steps of the ion-molecule reactions occurring in the ionosphere of Titan were performed at the synchrotron source Elettra in Italy. The measurements consisted of irradiating gas mixtures with a monochromatic photon beam, from the methane ionization threshold at 12.6 eV, up to and beyond the molecular nitrogen dissociative ionization threshold at 24.3 eV. Three gas mixtures of increasing complexity were used: N2/CH4 (0.96/0.04), N2/CH4/C2H2 (0.96/0.04/0.001), and N2/CH4/C2H2/C2H4 (0.96/ 0.04/0.001/0.001). The resulting ions were detected with a high-resolution (1 T) FT-ICR mass spectrometer as a function of time and VUV photon energy. In order to interpret the experimental results, a Titan ionospheric model was adapted to the laboratory conditions. This model had previously allowed the identification of the ions detected in the Titan upper atmosphere by the ion neutral mass spectrometer (INMS) onboard the Cassini spacecraft. Comparison between observed and modeled ion densities validates the kinetic model (reactions, rate constants, product branching ratios) for the primary steps of molecular growth. It also reveals differences that we attribute to an intense surface chemistry. This result implies that heterogeneous chemistry on aerosols might efficiently produce HCN and NH3 in the Titan upper atmosphere.
机译：在意大利的同步加速器源Elettra上进行了在Titan的电离层中发生的离子-分子反应的初始步骤的实验模拟。测量包括用单色光子束照射气体混合物，从12.6 eV的甲烷电离阈值，直至并超过24.3 eV的分子氮解离电离阈值。使用了三种复杂性不断提高的气体混合物：N2 / CH4（0.96 / 0.04），N2 / CH4 / C2H2（0.96 / 0.04 / 0.001）和N2 / CH4 / C2H2 / C2H4（0.96 / 0.04 / 0.001 / 0.001）。使用高分辨率（1 T）FT-ICR质谱仪检测到的离子随时间和VUV光子能量的变化而变化。为了解释实验结果，将泰坦电离层模型修改为适合实验室条件的模型。该模型以前允许通过卡西尼号飞船上的离子中性质谱仪（INMS）识别在泰坦高层大气中检测到的离子。观察到的和模拟的离子密度之间的比较验证了分子生长主要步骤的动力学模型（反应，速率常数，产物分支比）。它还揭示了我们归因于强烈的表面化学作用的差异。该结果表明，气溶胶的异质化学可能会在土卫六上层大气中有效产生HCN和NH3。

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