Modelling of c-C2H4O formation on grain surfaces
Modelling of c-C2H4O formation on grain surfaces
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颗粒表面 c-C2H4O 形成的模拟
DOI：
10.1111/j.1365-2966.2012.22112.x
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发表时间：
2012
影响因子：
4.8
通讯作者：
Stephen D. Price
中科院分区：
文献类型：
--
作者：
A. Occhiogrosso;S. Viti;Michael D. Ward;Stephen D. Price
尽管环氧乙烷（c-C2H4O）由于环应变而具有潜在的反应性，但它是一种复杂的分子，在星际致密核心的物理条件下似乎是稳定的；事实上，已经在几个柱密度为 10 13 cm i2 量级的高质量恒星形成区域中检测到了它（Ikeda 等人，2001 年）。迄今为止，其观测丰度无法通过化学模型重现，这可能是由于其化学对颗粒表面发挥的重大贡献。最近，Ward & Price (2011) 进行了实验，以研究以氧原子和乙烯冰为反应物的环氧乙烷的表面形成。我们提出了一个化学模型，其中包括 Ward & Price (2011) 关于 c-C2H4O 形成的最新实验结果。我们研究了致密核的物理参数对 c-C2H4O 丰度的影响。我们验证了环氧乙烷确实可以在冷阶段（当ISM致密核心形成时）通过在乙烯分子的C=C双键上添加氧原子来形成，并在热核心阶段通过热解吸释放。我们的理论结果与观测结果之间的定性比较表明，我们能够重现高质量恒星形成区域的环氧乙烷丰度。
Despite its potential reactivity due to ring strain, ethylene oxide (c-C2H4O) is a complex molecule that seems to be stable under the physical conditions of an interstellar dense core; indeed it has been detected towards several high-mass star forming regions with a column density of the order of 10 13 cm i2 (Ikeda et al. 2001). To date, its observational abundances cannot be reproduced by chemical models and this may be due to the significant contribution played by its chemistry on grain surfaces. Recently, Ward & Price (2011) have performed experiments in order to investigate the surface formation of ethylene oxide starting with oxygen atoms and ethylene ice as reactants. We present a chemical model which includes the most recent experimental results from Ward & Price (2011) on the formation of c-C2H4O. We study the influence of the physical parameters of dense cores on the abundances of c-C2H4O. We verify that ethylene oxide can indeed be formed during the cold phase (when the ISM dense cores are formed), via addition of an oxygen atom across the C=C double bond of the ethylene molecule, and released by thermal desorption during the hot core phase. A qualitative comparison between our theoretical results and those from the observations shows that we are able to reproduce the abundances of ethylene oxide towards high-mass star-forming regions.
Orion KL 的物理参数，来自对其 ISO 高分辨率远红外 CO 线谱建模
DOI：
10.1111/j.1365-2966.2008.13349.x
发表时间：
2008
影响因子：
4.8
作者：
Lerate M
通讯作者：
Lerate M