Electron-Induced Processing of Methanol Ice
Electron-Induced Processing of Methanol Ice
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甲醇冰的电子诱导加工
DOI：
10.1021/acsearthspacechem.0c00250
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
J. H. Bredehöft
中科院分区：
文献类型：
--
作者：
F. Schmidt;P. Swiderek;J. H. Bredehöft
用电子刺激和热脱附实验相结合的方法，对甲烷(CH4)、甲醛(H_2CO)、乙二醇(HOCH_2CH_2OH)、甲氧基甲醇(CH_3OCH_2OH)、二甲醚(CH_3OCH_3)和乙醇(CH_3CH_2OH)的生成进行了监测。在2.5~20 eV范围内测量了所有产物的能量相关相对产率，并推测了产物形成的反应机理。HOCH2CH2OH、CH3OCH2OH、CH3OCH3和CH3CH2OH的产率对能量的依赖关系与它们在CH3OH的最低电子激发能下的阈值非常一致。因此，这些产物的形成归因于中性电子激发态的解离形成的自由基的反应，以及在较高能量下的电离和随后的质子转移到邻近的CH3OH。这些电子-分子相互作用也有助于H_2CO和CH_4的非共振形成；这些后一种产物也是通过以前从阴离子电子刺激脱附(ESD)实验中报道的约4 eV的共振和在先前在一氧化碳(CO)的能量依赖的产率中看到的约13 eV的共振而产生的。本文的结果构成了迄今为止关于凝聚态CH3OH在低能电子曝光时产物形成的能量依赖关系的最完整的数据集。它们提供了电子碰撞引发的反应的全面图景，能量范围在2.5至20 eV之间，例如，在宇宙辐射的影响下，从凝聚物质中释放出的低能二次电子。
The formation of methane (CH4), formaldehyde (H2CO), ethylene glycol (HOCH2CH2OH), methoxymethanol (CH3OCH2OH), dimethyl ether (CH3OCH3), and ethanol (CH3CH2OH) upon electron irradiation of condensed multilayer adsorbates of CH3OH as a model of cosmic CH3OH ice has been monitored by the combined use of electron-stimulated and thermal desorption experiments. The energy-dependent relative yields of all products were measured between 2.5 and 20 eV, and the reaction mechanisms of product formation were deduced. The energy dependences of the yields of HOCH2CH2OH, CH3OCH2OH, CH3OCH3, and CH3CH2OH agree closely with their threshold at the lowest electronic excitation energy of CH3OH. The formation of these products is consequently ascribed to the reactions of radicals formed by the dissociation of neutral electronically excited states and, at higher energy, also by ionization and subsequent proton transfer to an adjacent CH3OH. These electron–molecule interactions also can contribute to the nonresonant formation of H2CO and CH4; these latter products are also produced through resonances around 4 eV reported previously from anion electron-stimulated desorption (ESD) experiments and around 13 eV seen earlier in the energy-dependent yield of carbon monoxide (CO). The present results constitute the most complete data set on the energy dependence of product formation during low-energy electron exposure of condensed CH3OH so far. They provide a comprehensive picture of the reactions triggered by electron impact with energies in the range between 2.5 and 20 eV as representative of low-energy secondary electrons that are released from condensed material, for instance, under the effect of cosmic radiation.
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电子碰撞引起的分子解离：来自甲烷、乙烯和乙烷的高里德伯碎片
影响因子：
4.4
作者：
J. Schiavone;David E. Donohue;R. Freund
通讯作者：
R. Freund
缩合甲醇中的低能电子诱导反应
DOI：
10.1088/1742-6596/635/6/062002
发表时间：
2015
期刊：
Journal of Physics: Conference Series
影响因子：
--
作者：
S. Kundu;Daly Davis;V. Prabhudesai;E. Krishnakumar
通讯作者：
E. Krishnakumar
固体甲醇的低能电子能量损失光谱：振动和电子激发
DOI：
10.1051/jcp/1994911223
发表时间：
1994
期刊：
Journal of Computers
影响因子：
--
作者：
M. Michaud;M. Fraser;L. Sanche
通讯作者：
L. Sanche
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
发表时间：
2019
影响因子：
--
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
通讯作者：
Christopher R. Arumainayagam
甲醇和乙烯缩合混合物中电子诱导形成乙基甲基醚
DOI：
10.1021/acs.jpca.8b10209
发表时间：
2019
期刊：
The journal of physical chemistry. A
影响因子：
--
作者：
F. Schmidt;P. Swiderek;J. H. Bredehöft
通讯作者：
J. H. Bredehöft