Detection of methoxymethanol as a photochemistry product of condensed methanol
Detection of methoxymethanol as a photochemistry product of condensed methanol
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作为缩合甲醇光化学产物的甲氧基甲醇的检测
DOI：
10.1093/mnrasl/slz019
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发表时间：
2019
影响因子：
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通讯作者：
Christopher R. Arumainayagam
中科院分区：
文献类型：
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作者：
Hope Schneider;Anna Caldwell;Sophie Coppieters 't Wallant;Lan Dau;Jean Huang;Ifunanya Nwolah;Muhammad Kasule;Christina E. Buffo;Ella Mullikin;Lily Widdup;Aurland Hay;S. Bao;J. Perea;Mayla Thompson;Rhoda Tano;Mileva Van Tuyl;Amy Wang;Sophia Bussey;Nina Sachdev;Christine Zhang;Michael C. Boyer;Christopher R. Arumainayagam
我们报告的鉴定甲氧基甲醇（CH 3 OCH 2 OH）作为光化学产物的冷凝甲醇（CH 3OH）的基础上进行的光子照射后的电离阈值（9.8 eV）的冷凝甲醇的能量下进行的程序升温脱附研究。2017年，根据阿塔卡马大型毫米/亚毫米阵列（阿尔马）的波段6和7的数据，首次在星际介质中检测到甲氧基甲醇。在宇宙中合成“复杂”的有机分子，如甲酸甲酯（HCOOCH 3）、二甲醚（CH 3 OCH 3）、乙酸（CH 3COOH）、乙二醇（HOCH 2CH 2 OH）和乙醇醛（HOCH 2CHO），被认为是星际冰中冷凝甲醇的紫外光分解。1995年进行的实验表明，电子诱导的甲醇宇宙冰类似物的辐解产生甲氧基甲醇。在最近的三篇出版物（2016年，2017年和2018年）中，甲氧基甲醇被认为是宇宙射线与星际冰相互作用产生的二次电子引起的反应的潜在示踪剂。然而，在这项研究中提出的结果表明，甲氧基甲醇可以形成从辐射化学和光化学的缩合甲醇。
We report the identification of methoxymethanol (CH3OCH2OH) as a photochemistry product of condensed methanol (CH3OH) based on temperature-programmed desorption studies conducted following photon irradiation at energies below the ionization threshold (9.8 eV) of condensed methanol. The first detection of methoxymethanol in the interstellar medium was reported in 2017 based on data from Bands 6 and 7 from the Atacama Large Millimeter/submillimeter Array (ALMA). The cosmic synthesis of “complex” organic molecules such as methyl formate (HCOOCH3), dimethyl ether (CH3OCH3), acetic acid (CH3COOH), ethylene glycol (HOCH2CH2OH), and glycolaldehyde (HOCH2CHO) has been attributed to UV photolysis of condensed methanol found in interstellar ices. Experiments conducted in 1995 demonstrated that electron-induced radiolysis of methanol cosmic ice analogues yields methoxymethanol. In three recent publications (2016, 2017, and 2018), methoxymethanol was considered as a potential tracer for reactions induced by secondary electrons resulting from the interaction of cosmic rays with interstellar ices. However, the results presented in this study suggest that methoxymethanol can be formed from both radiation chemistry and photochemistry of condensed methanol.