Fate of reactive intermediates formed in acetaldehyde under exposure to low-energy electrons
Fate of reactive intermediates formed in acetaldehyde under exposure to low-energy electrons
复制标题
暴露于低能电子下乙醛中形成的反应中间体的命运
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
E. Burean
中科院分区：
文献类型：
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作者：
P. Swiderek;C. Jäggle;D. Bankmann;E. Burean
化学反应已被诱导凝聚乙醛暴露于低能量的电子所证明的使用高分辨率电子能量损失（HREEL）光谱和热脱附光谱（TDS）。HREEL谱表明，当入射电子能量增加到10 eV以上时，乙醛薄膜发生了明显的改性。通过电子HREEL光谱观察到CO在暴露于入射能量为14 eV的电子时的释放。在分子膜暴露于入射能量为15.5 eV的电子时的振动光谱的变化进行了详细分析，使用参考光谱的一些潜在的产品分子。TDS数据清楚地揭示了乙醛的分解和形成的CO和CH4作为电子暴露下的主要产物。综合结果也为丙醛的形成提供了证据。其他不太突出的产品是丙酮，可能还有一种酒精。提出了合理的反应机理。
Chemical reactions have been induced in condensed acetaldehyde by exposure to low-energy electrons as demonstrated by use of high-resolution electron energy loss (HREEL) spectroscopy and thermal desorption spectroscopy (TDS). The HREEL spectra show that the acetaldehyde film is modified significantly when the incident electron energy is increased above 10 eV. Release of CO upon exposure to electrons at an incident energy of 14 eV is observed by electronic HREEL spectra. The changes in the vibrational spectra upon exposure of the molecular film to electrons at an incident energy of 15.5 eV are analyzed in detail using reference spectra for a number of potential product molecules. TDS data reveal clearly the decomposition of acetaldehyde and formation of CO and CH4 as major products under electron exposure. The combined results also give evidence for the formation of propionaldehyde. Other less prominent products are acetone and possibly an alcoholic species. A reaction mechanism is suggested that rationali...