CH3CN photochemistry at hot core margins
CH3CN photochemistry at hot core margins
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DOI：
10.1046/j.1365-8711.1999.02273.x
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发表时间：
1999-03
影响因子：
4.8
通讯作者：
D. Mackay
中科院分区：
文献类型：
--
作者：
D. Mackay
CH 3CN是一种在超紧凑热分子核（UCHCs）中比暗云气相化学更丰富的物质。UCHCs与新形成的OB星非常接近，这表明撞击的远紫外（FUV）辐射场可能有助于核心边缘的化学处理。在这篇论文中。假设增强的FUV辐射场与从颗粒地幔冰蒸发的致密中性物质相互作用，探索气相CH 3CN形成的光化学。我们能够表明，高CH 3CN/CH 3OH丰度比可以产生从CH 3OH和NH3前体在这样的光子占主导地位的利润率作为一个现实的替代粮食表面的起源。我们表明，所观察到的CH 3 CN/CH 3 OH柱密度比对UCHC在G34.3+0.15可以解释为产生：从光化学生成的CH 3 CN在气相中。
CH3CN is a species observed to be much more abundant in ultracompact hot molecular cores (UCHCs) than can be accounted for by dark cloud gas phase chemistry. The close proximity of UCHCs to newly formed OB stars suggests that an impinging far ultraviolet (FUV) radiation field might contribute to the chemical processing at the core margins. In this paper. the photochemistry of gas phase CH3CN formation is explored assuming an enhanced FUV radiation field interacts with dense neutral material evaporated from grain mantle ices. We are able to show that high CH3CN/CH3OH abundance ratios can be generated from CH3OH and NH3 precursors in such a photon-dominated margin as a realistic alternative to a grain surface origin. We show that the observed CH3 CN/CH3 OH column density ratio towards the UCHC in G34.3+0.15 can be interpreted as arising: from photochemical generation of CH3 CN in the gas phase.