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Polycyclic aromatic hydrocarbon growth in a benzene discharge explored by IR-UV action spectroscopy
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2022-06-13 , DOI: 10.1039/d2cp01631a
Alexander K Lemmens 1, 2 , Daniël B Rap 2 , Sandra Brünken 2 , Wybren Jan Buma 1, 2 , Anouk M Rijs 3
Affiliation  

Infrared signatures of polycyclic aromatic hydrocarbons (PAHs) are detected towards many phases of stellar evolution. PAHs are major players in the carbon chemistry of the interstellar medium, forming the connection between small hydrocarbons and large fullerenes. However, as details on the formation of PAHs in these environments are still unclear, modeling their abundance and chemistry has remained far from trivial. By combining molecular beam mass-selective IR spectroscopy and calculated IR spectra, we analyze the discharge of benzene and identify resulting products including larger PAHs, radicals and intermediates that serve as promising candidates for radio astronomical searches. The identification of various reaction products indicates that different gas-phase reaction mechanisms leading to PAH growth must occur under the same conditions to account for all observed PAH-related species, thereby revealing the complex and interconnected network of PAH formation pathways. The results of this study highlight key (exothermic) reactions that need to be included in astrochemical models describing the carbon chemistry in our universe.

中文翻译:


通过红外-紫外作用光谱探索苯放电中多环芳烃的生长



在恒星演化的许多阶段都可以检测到多环芳烃(PAH)的红外特征。多环芳烃是星际介质碳化学的主要参与者,在小碳氢化合物和大富勒烯之间形成了联系。然而,由于这些环境中多环芳烃形成的细节仍不清楚,对其丰度和化学性质进行建模仍然非常重要。通过结合分子束质量选择红外光谱和计算的红外光谱,我们分析了苯的排放并识别了所得产物,包括较大的多环芳烃、自由基和中间体,它们是射电天文搜索的有希望的候选物。各种反应产物的鉴定表明,导致 PAH 生长的不同气相反应机制必须在相同条件下发生,才能解释所有观察到的 PAH 相关物种,从而揭示 PAH 形成途径的复杂且相互关联的网络。这项研究的结果强调了描述宇宙碳化学的天体化学模型中需要包含的关键(放热)反应。
更新日期:2022-06-13
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