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UNIFIED MICROSCOPIC-MACROSCOPIC MONTE CARLO SIMULATIONS OF COMPLEX ORGANIC MOLECULE CHEMISTRY IN COLD CORES
Chang, Qiang1,2,3; Herbst, Eric3,4,5
2016-03-10
Source PublicationASTROPHYSICAL JOURNAL
Volume819Issue:2
AbstractThe 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.
KeywordIsm: Clouds Ism: Molecules Molecular Processes
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.3847/0004-637X/819/2/145
WOS KeywordGAS-GRAIN CHEMISTRY ; INTERSTELLAR-MOLECULES ; PROTOPLANETARY DISK ; SURFACE-CHEMISTRY ; GALACTIC-CENTER ; METHYL FORMATE ; H-2 FORMATION ; HOT CORES ; PHASE ; CLOUDS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000372305700057
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16172
Collection空间目标与碎片观测研究基地
Affiliation1.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
Recommended Citation
GB/T 7714
Chang, Qiang,Herbst, Eric. UNIFIED MICROSCOPIC-MACROSCOPIC MONTE CARLO SIMULATIONS OF COMPLEX ORGANIC MOLECULE CHEMISTRY IN COLD CORES[J]. ASTROPHYSICAL JOURNAL,2016,819(2).
APA Chang, Qiang,&Herbst, Eric.(2016).UNIFIED MICROSCOPIC-MACROSCOPIC MONTE CARLO SIMULATIONS OF COMPLEX ORGANIC MOLECULE CHEMISTRY IN COLD CORES.ASTROPHYSICAL JOURNAL,819(2).
MLA Chang, Qiang,et al."UNIFIED MICROSCOPIC-MACROSCOPIC MONTE CARLO SIMULATIONS OF COMPLEX ORGANIC MOLECULE CHEMISTRY IN COLD CORES".ASTROPHYSICAL JOURNAL 819.2(2016).
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