Formation of Polyoxymethylenes in Extraterrestrial Ice Analogs of Formaldehyde Exposed to Ionizing Radiation
文献类型：期刊论文
| 作者 | Gong, Qi'ang1; Bai, Xilin1; Lu, Jinghui5; Yang, Jiuzhong5; Pan, Yang5; Sun, Zhenrong1; Kaiser, Ralf I.2; Yang, Tao1,3,4 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2025-11-20 |
| 卷号 | 994期号:1页码:70 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ae0cb7 |
| 产权排序 | 4 |
| 英文摘要 | Polyoxymethylenes (POMs) have long been hypothesized as key organics in comets, as their decomposition products could account for the possible extended cometary formaldehyde (H2CO) source. However, POMs (X-(CH2O)n-Y; n > 2) are hitherto unobserved in deep space, and their possible formation mechanisms have still remained elusive. Here, we report on the laboratory formation of formaldehyde oligomers (H-(CH2O)n-H; n = 2-4) within extraterrestrial ice analogs of formaldehyde exposed to energetic electrons simulating secondary electrons generated by galactic cosmic rays passing through ices. The potential identification of these short-chain-length POMs, such as methoxymethanol (CH3OCH2OH), (methoxymethoxy)methanol (CH3OCH2OCH2OH), and (methoxymethoxymethoxy)methanol (CH3OCH2OCH2OCH2OH), is accomplished by utilizing the synchrotron vacuum ultraviolet photoionization reflectron time-of-flight mass spectrometry (SVUV-PI-ReTOF-MS) technique coupled with the temperature-programmed desorption method. A radical-induced formaldehyde polymerization mechanism is proposed to address the formation of POMs, with the competition between chain propagation and chain termination determining the chain length of the polymers and availability of reactive hydrogen atoms. The electron impact ionization of POMs as well as accompanied fragmentation of their cations are analyzed via a quadrupole mass spectrometer, with mass peaks compared with those collected by the Positive Ion Cluster Composition Analyzer instrument on board the Giotto spacecraft in the inner coma of comet 1P/Halley, and by the Ptolemy instrument on the comet 67P/Churyumov-Gerasimenko. Our findings might support the proposal that (small) POMs exist on comets and nominate hitherto unobserved POMs such as (methoxymethoxy)methanol (CH3OCH2OCH2OH) and (methoxymethoxymethoxy)methanol (CH3OCH2OCH2OCH2OH) for future astronomical searches. |
| WOS关键词 | COMPLEX ORGANIC-MOLECULES ; PHOTOIONIZATION MASS-SPECTROMETRY ; ELECTRON-SPIN-RESONANCE ; INTERSTELLAR ICES ; CARBON-MONOXIDE ; EXTENDED SOURCE ; BASIS-SETS ; METHANOL ; METHOXYMETHANOL ; CHEMISTRY |
| 资助项目 | MOST divided by National Natural Science Foundation of China (NSFC)[12034008] ; MOST divided by National Natural Science Foundation of China (NSFC)[12250003] ; MOST divided by National Natural Science Foundation of China (NSFC)[92461301] ; MOST divided by National Natural Science Foundation of China (NSFC)[12274140] ; Xinjiang Tianchi Talent Program (2023)[N/A] ; National Science Foundation (NSF)[AST 2403867] ; STCSM divided by Natural Science Foundation of Shanghai Municipality ((sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic))[22ZR1421400] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001616366400001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | MOST divided by National Natural Science Foundation of China (NSFC) ; Xinjiang Tianchi Talent Program (2023) ; National Science Foundation (NSF) ; STCSM divided by Natural Science Foundation of Shanghai Municipality ((sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)) |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/8323]  |
| 专题 | 研究单元未命名 |
| 通讯作者 | Kaiser, Ralf I.; Yang, Tao |
| 作者单位 | 1.East China Normal Univ, State Key Lab Precis Spect, Shanghai 200062, Peoples R China 2.Univ Hawaii Manoa, Dept Chem, Honolulu, HI 96822 USA 3.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China 4.Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Shanxi, Peoples R China 5.Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Anhui, Peoples R China |
| 推荐引用方式 GB/T 7714 | Gong, Qi'ang,Bai, Xilin,Lu, Jinghui,et al. Formation of Polyoxymethylenes in Extraterrestrial Ice Analogs of Formaldehyde Exposed to Ionizing Radiation[J]. ASTROPHYSICAL JOURNAL,2025,994(1):70. |
| APA | Gong, Qi'ang.,Bai, Xilin.,Lu, Jinghui.,Yang, Jiuzhong.,Pan, Yang.,...&Yang, Tao.(2025).Formation of Polyoxymethylenes in Extraterrestrial Ice Analogs of Formaldehyde Exposed to Ionizing Radiation.ASTROPHYSICAL JOURNAL,994(1),70. |
| MLA | Gong, Qi'ang,et al."Formation of Polyoxymethylenes in Extraterrestrial Ice Analogs of Formaldehyde Exposed to Ionizing Radiation".ASTROPHYSICAL JOURNAL 994.1(2025):70. |
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