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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >EUV Photochemical Production of Unsaturated Hydrocarbons: mplications to EUV Photochemistry in Titan and Jovian Planets
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EUV Photochemical Production of Unsaturated Hydrocarbons: mplications to EUV Photochemistry in Titan and Jovian Planets

机译：EUV光化学法生产不饱和烃：泰坦和木星行星中EUV光化学的意义

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摘要

The EUV photochemistry of methane is one of the dominant chemical processes in the upper atmospheres of Titan and Jovian planets. The dilution of CH4 with N2 significantly changes the subsequent hydrocarbon chemistry initiated by EUV photoionization. At wavelengths below 80 nm, the presence of the dominant N2 species in a N2/CH4 gas mixture ()95/5) selectively enhances the formation of unsaturated hydrocarbons, such as benzene and toluene, while pure CH4 gas leads to a wide mixture of saturated/unsaturated hydrocarbon species. This enhanced formation of unsaturated hydrocarbons is most likely initiated by the generation of CH3 + via a dissociative charge-transfer reaction between N2 + and CH4. This mechanism was further confirmed with the dilution of CH4 with Ar, which shows similarly enhanced formation of unsaturated species from an Ar/CH4 ()95/5) gas mixture. In contrast, the depleted generation of unsaturated species from a H2/CH4 gas mixture ()95/5) suggests that the CH5 + ion generated via a proton-transfer reaction is not an important precursor in the production of complex unsaturated hydrocarbons. Therefore, it is the dissociative charge-transfer reaction of CH4 that initiates the formation of unsaturated complex hydrocarbons through production of C2H5 + with subsequent dissociative recombination. Implications regarding photochemistry in the upper atmospheres of Titan and the Jovian planets are discussed.
机译：甲烷的EUV光化学是土卫六和木星行星高层大气中的主要化学过程之一。用N2稀释CH4会显着改变EUV光电离引发的后续烃化学反应。在低于80 nm的波长下，N2 / CH4气体混合物（）95/5）中主要的N2物种的存在选择性地增强了不饱和烃（如苯和甲苯）的形成，而纯CH4气体导致了饱和/不饱和烃类。这种不饱和烃形成的增强很可能是通过N2 +和CH4之间的解离电荷转移反应生成CH3 +引发的。通过用Ar稀释CH4进一步证实了这一机理，这显示出类似的增强了从Ar / CH4（）95/5）气体混合物中形成不饱和物质的能力。相反，从H2 / CH4气体混合物中贫化的不饱和物质生成（）95/5）表明，通过质子转移反应生成的CH5 +离子在复杂的不饱和烃生产中不是重要的前体。因此，CH4的解离电荷转移反应通过生成C2H5 +并随后进行解离重组，引发了不饱和配位烃的形成。讨论了有关泰坦和木星行星高层大气中光化学的含义。

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