Effect of surface H-2 on molecular hydrogen formation on interstellar grains
文献类型：期刊论文
| 作者 | Zhao, Gang4; Chang, Qiang4 ; Zhang, Xia3; Quan, Donghui2; Zhang, Yong1; Li, Xiao-Hu3
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 出版日期 | 2022-03-31 |
| 卷号 | 512期号:3页码:3137-3148 |
| 关键词 | astrochemistry molecular processes ISM: molecules |
| ISSN号 | 0035-8711 |
| DOI | 10.1093/mnras/stac655 |
| 通讯作者 | Chang, Qiang(changqiang@sdut.edu.cn) |
| 英文摘要 | We investigate how the existence of hydrogen molecules on grain surfaces may affect H-2 formation efficiency in diffuse and translucent clouds. Hydrogen molecules are able to reduce the desorption energy of H atoms on grain surfaces in models. The detailed microscopic Monte Carlo method is used to perform model simulations. We found that the impact of the existence of H(2 )on H(2 )formation efficiency strongly depends on the diffusion barriers of H(2 )on grain surfaces. Diffuse cloud models that do not consider surface H(2 )predict that H atom recombination efficiency is above 0.5 over a grain temperature (T) range 10 and 14 K. The adopted H-2 diffusion barriers in diffuse cloud models that consider surface H(2 )are 80 per cent H(2 )desorption energies so that H(2 )can be trapped in stronger binding sites. Depending on model parameters, these diffuse cloud models predict that the recombination efficiency is between nearly 0 and 0.5 at 10 <= T <= 14 K. Translucent cloud model results show that H(2 )formation efficiency is not affected by the existence of surface H(2 )if the adopted average H(2 )diffusion barrier on grain surfaces is low (194 K) so that H(2 )can diffuse rapidly on grain surfaces. However, the recombination efficiency can drop to below 0.002 at T >= 10 K if higher average H(2 )diffusion barrier is used (255 K) in translucent cloud models. |
| WOS关键词 | DUST GRAINS ; RECOMBINATION ; SIMULATION ; EFFICIENCY ; CHEMISTRY |
| 资助项目 | National Natural Science Foundation of China[11973099] ; National Natural Science Foundation of China[11973075] ; National Natural Science Foundation of China[12173023] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000776288600003 |
| 出版者 | OXFORD UNIV PRESS |
| 资助机构 | National Natural Science Foundation of China |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/4599]  |
| 专题 | 天体化学研究团组 |
| 通讯作者 | Chang, Qiang |
| 作者单位 | 1.Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai 519082, Peoples R China 2.Eastern Kentucky Univ, Dept Chem, Richmond, KY 40475 USA 3.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Peoples R China 4.Shandong Univ Technol, Sch Phys & Optoeletron Engn, Zibo 255000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao, Gang,Chang, Qiang,Zhang, Xia,et al. Effect of surface H-2 on molecular hydrogen formation on interstellar grains[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2022,512(3):3137-3148. |
| APA | Zhao, Gang,Chang, Qiang,Zhang, Xia,Quan, Donghui,Zhang, Yong,&Li, Xiao-Hu.(2022).Effect of surface H-2 on molecular hydrogen formation on interstellar grains.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,512(3),3137-3148. |
| MLA | Zhao, Gang,et al."Effect of surface H-2 on molecular hydrogen formation on interstellar grains".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 512.3(2022):3137-3148. |
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