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题名: UNIFIED MICROSCOPIC-MACROSCOPIC MONTE CARLO SIMULATIONS OF COMPLEX ORGANIC MOLECULE CHEMISTRY IN COLD CORES
作者: Chang, Qiang1, 2, 3; Herbst, Eric3, 4, 5
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2016-03-10
卷号: 819, 期号:2
关键词: ISM: clouds ; ISM: molecules ; molecular processes
DOI: 10.3847/0004-637X/819/2/145
文章类型: Article
英文摘要: The recent discovery of methyl formate and dimethyl ether in the gas phase of cold cores with temperatures as cold as 10 K challenges our previous astrochemical models concerning the formation of complex organic molecules (COMs). The strong correlation between the abundances and distributions of methyl formate and dimethyl ether further shows that current astrochemical models may be missing important chemical processes in cold astronomical sources. We investigate a scenario in which COMs and the methoxy radical can be formed on dust grains via a socalled chain reaction. mechanism, in a similar manner to CO2. A unified gas-grain microscopic-macroscopic Monte Carlo approach with both normal and interstitial sites for icy grain mantles is used to perform the chemical simulations. Reactive desorption with varying degrees of efficiency is included to enhance the nonthermal desorption of species formed on cold dust grains. In addition, varying degrees of efficiency for the surface formation of methoxy are also included. The observed abundances of a variety of organic molecules in cold cores can be reproduced in our models. The strong correlation between the abundances of methyl formate and dimethyl ether in cold cores can also be explained. Nondiffusive chemical reactions on dust grain surfaces may play a key role in the formation of some COMs.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: GAS-GRAIN CHEMISTRY ; INTERSTELLAR-MOLECULES ; PROTOPLANETARY DISK ; SURFACE-CHEMISTRY ; GALACTIC-CENTER ; METHYL FORMATE ; H-2 FORMATION ; HOT CORES ; PHASE ; CLOUDS
收录类别: SCI
项目资助者: National Science Foundation ; NASA Exobiology and Evolutionary Biology program through Rensselaer Polytechnic Institute
语种: 英语
WOS记录号: WOS:000372305700057
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16172
Appears in Collections:空间目标与碎片观测研究基地_期刊论文

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作者单位: 1.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, 2 West Beijing Rd, Nanjing 210008, Peoples R China
3.Univ Virginia, Dept Chem, Charlottesville, VA 22904 USA
4.Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA
5.Univ Virginia, Dept Phys, Charlottesville, VA 22904 USA
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