The in situ formation of large molecules in dense interstellar clouds
The in situ formation of large molecules in dense interstellar clouds
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致密星际云中大分子的原位形成
DOI：
10.1086/169546
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
E. Herbst
中科院分区：
文献类型：
--
作者：
E. Herbst
已经开发了一个简单的模型来估计稠密星际云中气相离子分子反应产生的大碳氢分子的丰度。在模型中考虑了30个碳原子大小的烃。分子的复杂性是通过涉及较小的烃中性和离子的合成反应建立的。一个准时间依赖性的模型已被利用，其中的丰度小于10个碳原子的碳氢化合物被固定在以前的模型中计算的值。然后，更复杂的碳氢化合物的丰度的时间依赖性。结果表明，重要的速率系数的有利值，它是可能的，以产生相当大的丰度的烃分子的大小超过约20个碳原子的时间尺度不大于10至第6年。参考文献31篇。
A simple model has been developed to estimate the abundances of large hydrocarbon molecules produced by gas-phase, ion-molecule reactions in dense interstellar clouds. Hydrocarbons through 30 carbon atoms in size are considered in the model. Molecular complexity is built up via synthetic reactions involving smaller hydrocarbon neutral and ions. A quasi-time-dependent model has been utilized in which the abundances of hydrocarbons with fewer than 10 carbon atoms are fixed at values calculated in a previous model. The time dependence of the abundances of the more complex hydrocarbons is then followed. The results show that, with favorable values for important rate coefficients, it is possible to produce sizeable abundances of hydrocarbon molecules exceeding about 20 carbon atoms in size an in a time scale of not greater than 10 to the 6th yr. 31 refs.