论文标题
在冷ISM中作为苯的苯硝基列：CN + C $ _6 $ h $ _6 $的低温速率系数
Benzonitrile as a proxy for benzene in the cold ISM: low temperature rate coefficients for CN + C$_6$H$_6$
论文作者
论文摘要
CN和苯（C $ _6 $ h $ _6 $）之间的低温反应在星体化学群落中引起了重大兴趣，这是由于最近检测到了使用射电天文学在星际培养基（ISM）中鉴定出的第一个芳族分子。建议苯硝基酯是最简单的芳族分子之一苯的低温代理，它可能是多环芳烃（PAHS）的前体。为了评估苯第二主作为苯的稳健性，需要低温动力学测量以确认在冷致密云中发现的低气温下反应是否迅速保持迅速。在这里，我们研究了C $ _6 $ h $ _6 $ _6 $ + CN在温度范围15--295 K中使用良好的CRESU技术（法国首字母缩写词（法国首字母缩写）与均匀超音速流的反应动力学相结合）与脉冲激光光分析激光激光激光诱导的型号（PLP-LIF）相结合。 We obtain rate coefficients, $k(T)$, in the range (3.6--5.4) $\times$ 10$^{-10}$ cm$^3$ s$^{-1}$ with no obvious temperature dependence between 15--295 K, confirming that the CN + C$_6$H$_6$ reaction remains rapid at temperatures relevant to the cold ISM.
The low temperature reaction between CN and benzene (C$_6$H$_6$) is of significant interest in the astrochemical community due to the recent detection of benzonitrile, the first aromatic molecule identified in the interstellar medium (ISM) using radio astronomy. Benzonitrile is suggested to be a low temperature proxy for benzene, one of the simplest aromatic molecules, which may be a precursor to polycyclic aromatic hydrocarbons (PAHs). In order to assess the robustness of benzonitrile as a proxy for benzene, low temperature kinetics measurements are required to confirm whether the reaction remains rapid at the low gas temperatures found in cold dense clouds. Here, we study the C$_6$H$_6$ + CN reaction in the temperature range 15--295 K, using the well-established CRESU technique (a French acronym standing for Reaction Kinetics in Uniform Supersonic Flow) combined with Pulsed Laser Photolysis-Laser-Induced Fluorescence (PLP-LIF). We obtain rate coefficients, $k(T)$, in the range (3.6--5.4) $\times$ 10$^{-10}$ cm$^3$ s$^{-1}$ with no obvious temperature dependence between 15--295 K, confirming that the CN + C$_6$H$_6$ reaction remains rapid at temperatures relevant to the cold ISM.
