通过Eley-Rideal提取反应在星际多环芳烃上形成分子氢
Molecular hydrogen formation on interstellar PAHs through Eley-Rideal abstraction reactions
摘要：
我们目前的实验数据上的气相多环芳烃（PAH）阳离子的H2形成过程。这个过程进行了研究，通过暴露晕自由基阳离子，限制在一个射频离子阱，气相H原子。已观察到最多23个氢原子的顺序连接。暴露于原子D而不是H可以将附着与竞争的抽象反应区分开来，因为后者现在在测量的质谱中留下了独特的指纹。使用真实的截面和用于附着和提取的屏障对实验结果进行建模，得到提取与附着截面的1：2的比率。抽象的强大贡献表明，H2形成星际PAH阳离子是一个数量级更相关的比以前认为的。
英文摘要：
We present experimental data on H2 formation processes on gas-phase polycyclic aromatic hydrocarbon (PAH) cations. This process was studied by exposing coronene radical cations, confined in a radio-frequency ion trap, to gas phase H atoms. Sequential attachment of up to 23 hydrogen atoms has been observed. Exposure to atomic D instead of H allows one to distinguish attachment from competing abstraction reactions, as the latter now leave a unique fingerprint in the measured mass spectra. Modeling of the experimental results using realistic cross sections and barriers for attachment and abstraction yield a 1:2 ratio of abstraction to attachment cross sections. The strong contribution of abstraction indicates that H2 formation on interstellar PAH cations is an order of magnitude more relevant than previously thought.
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