| 二甲胺同步辐射光电离解离机理的质谱研究 |
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| 引用本文： | 胡正发,王振亚,周士康,王娟,盛六四,张允武.二甲胺同步辐射光电离解离机理的质谱研究[J].化学学报,2002,60(5):825-829. |
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| 作者姓名： | 胡正发 王振亚 周士康 王娟 盛六四 张允武 |
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| 作者单位： | 1. 中国科学院安徽光学精密机械研究所,环境光谱学实验室,合肥,230031
2. 中国科学技术大学,国家同步辐射实验室,合肥,230026 |
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| 摘 要： | 利用同步辐射光源，结合飞行时间质谱，在超声射流冷却条件下研究了(CH_3) _2NH(DMA)的光电离解离机理。实验观察到四种主要离子(CH_3)_2NH·~+， CH_3NH~+CH_2，CH_2NH_2~+和CHNH~+，质荷比分别为m/z = 45，44，30和28。四种 离子的出现势（AE）分别为8.26，9.52，11.93和11.27 eV，其中分子电离热IP = （8.26 ± 0.01） eV，计算得到分子离子的生成热Δ_fH~o = 778.55 kJ/mol。 分析表明离子CH_3NH~+CH_2来自母体离子的α去H过程。其他碎片离子由后续逐级 解离去H反应以及脱CH_3通道生成。
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| 关 键 词： | 辐射 光电离 飞行时间质谱法 二甲胺 |
| 修稿时间： | 2001年9月17日 |
Mass Resolved Photoionization and Photodissociation of Dimethylamine with Synchrotron Radiation |
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| HU,Zheng-Fa WANG,Zhen-Ya ZHOU,Shi-Kang.Mass Resolved Photoionization and Photodissociation of Dimethylamine with Synchrotron Radiation[J].Acta Chimica Sinica,2002,60(5):825-829. |
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| Authors: | HU Zheng-Fa WANG Zhen-Ya ZHOU Shi-Kang |
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| Institution: | Environment Spectroscopy Laboratory, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences,Hefei(230031);National Synchrotron Radiation Laboratory, University of science and Technology of China,Hefei(230026) |
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| Abstract: | Photoionization and photodissociation of dimethylamine (DMA), by using synchrotron radiation combining with time of flight-mass spectroscopy (TOF-MS), is performed under supersonic molecular beam. Four main ions of (CH_3)_2NH·~+, CH_3NH~+CH_2, CH_2NH_2~+ and CHNH~+ are observed, at appearance energy (AE) of 8.26, 9.52, 11.93 and 11.27 eV respectively. DMA's IP = 8.26 eV and heat of formation of parent ion Δ_fH~o = 778.55 kJ/mol obtained are in well agreement with recommended values. The photo fragmentation mechanism is also discussed. |
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| Keywords: | synchrotron radiation photoionization (CH 3) 2NH appearance energy (AE) |
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