电子电离
离子
电离
质谱法
原子物理学
分析化学(期刊)
三甲胺
航程(航空)
分辨率(逻辑)
分光计
材料科学
电子
电离能
化学
物理
核物理学
光学
人工智能
有机化学
复合材料
生物化学
色谱法
计算机科学
作者
A. Trindade,J. Escada,M. Rajado Silva,F.I.G.M. Borges,F.P. Santos
标识
DOI:10.1088/1748-0221/17/02/p02031
摘要
Abstract In this work, a mass spectrometer residual gas analyzer (RGA) was used to determine the ionization thresholds (ionization energy and appearance energy) in trimethylamine (TMA, (CH 3 ) 3 N), as well as the relative abundance of the ions produced by electron impact in the 7.5–70 eV electron energy range. The ten most intense peaks in the RGA mass spectra, corresponding to the most abundant ions formed by electron impact at 70 eV in TMA, were analyzed. The ionization energy for TMA, as assessed by this experiment, is 7.9 ± 0.2 eV and it is the threshold of formation of the C 3 H 9 N + ion. This ion species is the most abundant one below 18 eV electron impact energy, being surpassed by the C 3 H 8 N + ion above this energy. In order to assess the method used, methane (CH 4 ), whose ionization properties are well established, was previously studied. The agreement between the results obtained for CH 4 and those found in the literature provided the validation of the experimental method used in this work.
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