Experimental evidence for glycolaldehyde and ethylene glycol formation by surface hydrogenation of CO molecules under dense molecular cloud conditions
Experimental evidence for glycolaldehyde and ethylene glycol formation by surface hydrogenation of CO molecules under dense molecular cloud conditions
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DOI：
10.1093/mnras/stu2603
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发表时间：
2015-04-01
影响因子：
4.8
通讯作者：
Linnartz, H.
中科院分区：
文献类型：
--
作者：
Fedoseev, G.;Cuppen, H. M.;Linnartz, H.
本研究的重点是形成两个分子的天体生物学的重要性-乙醇醛（HC（O）CH 2 OH）和乙二醇（H2 C（OH）CH 2 OH）-通过表面氢化的CO分子。我们的实验旨在模拟星际暗云区域的CO冻结阶段，以及热处理和高能处理成为主导。它表明，沿着形成H2 CO和CH 3OH-两个公认的CO氢化产物-也形成具有多于一个碳原子的分子。该过程的关键步骤被认为是两个HCO自由基的重组，然后形成C-C键。实验建立的反应途径实施到一个连续时间的随机行走蒙特卡罗模型，以前用于模拟天体化学时标上的CH 3OH的形成，研究它们对致密星际云中乙醇醛和乙二醇的固态丰度的影响。
This study focuses on the formation of two molecules of astrobiological importance - glycolaldehyde (HC(O)CH2OH) and ethylene glycol (H2C(OH)CH2OH) - by surface hydrogenation of CO molecules. Our experiments aim at simulating the CO freeze-out stage in interstellar dark cloud regions, well before thermal and energetic processing become dominant. It is shown that along with the formation of H2CO and CH3OH - two well-established products of CO hydrogenation - also molecules with more than one carbon atom form. The key step in this process is believed to be the recombination of two HCO radicals followed by the formation of a C-C bond. The experimentally established reaction pathways are implemented into a continuous-time random-walk Monte Carlo model, previously used to model the formation of CH3OH on astrochemical time-scales, to study their impact on the solid-state abundances in dense interstellar clouds of glycolaldehyde and ethylene glycol.