In situ characterization of volatile and refractory hydrocarbons produced by UV photolysis of interstellar C2H2 ice
文献类型：期刊论文
| 作者 | Samarth, P.1,4; Fedoseev, G.2; Bulak, M.4; Ioppolo, S.3; Hornekaer, L.3; van Dishoeck, E. F.1; Linnartz, H.4; Chuang, K. J.4 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2026-01-23 |
| 卷号 | 705页码:A229 |
| 关键词 | astrochemistry molecular processes solid state: refractory solid state: volatile methods: laboratory: solid state ISM: molecules |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/202556672 |
| 产权排序 | 3 |
| 英文摘要 | Context. Acetylene (C2H2) has been commonly observed in various astronomical objects, including star-forming regions, young stellar objects, and our Solar System. Theoretical and laboratory studies have proposed multiple mechanisms that link this simplest alkyne to volatile hydrocarbons and polycyclic aromatic hydrocarbons through UV- or cosmic-ray-induced energetic processes. However, it is still unclear whether refractory material can be efficiently formed through solid-state reactions involving C2H2 on dust grains. Aims. In this work, we aim to experimentally study the chemical complexity induced by the UV irradiation of pure C2H2 ice and characterize both volatile and nonvolatile photoproducts to better understand the evolution of simple hydrocarbons under astronomically relevant conditions. Methods. Experiments were performed using MATRI(2)CES, an ultra-high vacuum, cryogenic setup to investigate the C2H2 ice chemistry induced by UV photons between 7.2 and 10.2 eV at 15 K. The UV-processed ice samples were monitored in situ by laser desorption post-ionization reflection time-of-flight mass spectrometry (LDPI ReTOF-MS) in combination with the pulsed ion deflection (PID) technique. The mass spectrometric data of volatiles and refractory residues produced upon VUV photolysis of C2H2 ice were collected in situ at 15 and 300 K, respectively, minimizing uncertainties associated with external analytical methods used in previous studies. Results. The experimental results obtained after photolysis of pure C2H2 ice with a fluence of 3 x 10(17) photons cm(-2) (10(6) years in dense clouds, show the formation of large saturated and unsaturated hydrocarbons containing up to 13 carbon atoms, including molecules identified in previous similar studies. After the sublimation of these volatile products, measurements of the residue at 300 K revealed a rich and distinct mass spectrum suggesting the synthesis of refractories composed of conjugated triple bonds (-C equivalent to C-) and double (-C=C-) bonds. The astrochemical implications and the possible connection of the produced residues with unidentified infrared emission bands are discussed. |
| WOS关键词 | POLYCYCLIC AROMATIC-HYDROCARBONS ; COMPLEX ORGANIC-MOLECULES ; PHOTON-DOMINATED REGION ; DUST-GAS CHEMISTRY ; COMET 67P/CHURYUMOV-GERASIMENKO ; INFRARED-SPECTROSCOPY ; OPTICAL-CONSTANTS ; ATOM ADDITION ; CO MOLECULES ; AGB OUTFLOWS |
| 资助项目 | [DNRF150] ; [DANII] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001669227900022 |
| 出版者 | EDP SCIENCES S A |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/8511]  |
| 专题 | 天体化学研究团组 |
| 通讯作者 | Samarth, P. |
| 作者单位 | 1.Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands 2.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 3.Aarhus Univ, Ctr Interstellar Catalysis, Dept Phys & Astron, DK-8000 Aarhus, Denmark 4.Leiden Univ, Lab Astrophys, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands |
| 推荐引用方式 GB/T 7714 | Samarth, P.,Fedoseev, G.,Bulak, M.,et al. In situ characterization of volatile and refractory hydrocarbons produced by UV photolysis of interstellar C2H2 ice[J]. ASTRONOMY & ASTROPHYSICS,2026,705:A229. |
| APA | Samarth, P..,Fedoseev, G..,Bulak, M..,Ioppolo, S..,Hornekaer, L..,...&Chuang, K. J..(2026).In situ characterization of volatile and refractory hydrocarbons produced by UV photolysis of interstellar C2H2 ice.ASTRONOMY & ASTROPHYSICS,705,A229. |
| MLA | Samarth, P.,et al."In situ characterization of volatile and refractory hydrocarbons produced by UV photolysis of interstellar C2H2 ice".ASTRONOMY & ASTROPHYSICS 705(2026):A229. |
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来源：新疆天文台
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