用于自由基化学反应研究的真空紫外光电离飞行时间质谱仪

引用本文: 王涛, 唐小锋, 温作赢, 张翠红, 张为俊. 用于自由基化学反应研究的真空紫外光电离飞行时间质谱仪[J]. 分析化学, 2020, 48(1): 28-33. doi: 10.19756/j.issn.0253-3820.191607 shu

Citation: WANG Tao, TANG Xiao-Feng, WEN Zuo-Ying, ZHANG Cui-Hong, ZHANG Wei-Jun. A Vacuum Ultraviolet Photoionization Time-of-Flight Mass Spectrometer for Investigation of Free Radical Reaction[J]. Chinese Journal of Analytical Chemistry, 2020, 48(1): 28-33. doi: 10.19756/j.issn.0253-3820.191607 shu

用于自由基化学反应研究的真空紫外光电离飞行时间质谱仪

1.
安徽大学物质科学与信息技术研究院, 合肥 230601;
2.
中国科学院安徽光学精密机械研究所, 合肥 230026;
3.
中国科学技术大学环境科学与光电技术学院, 合肥 230026
基金项目:
本文系国家自然科学基金项目（Nos.21773249，91644109，91544228）和中国科学院项目（No.116134KYSB20170048）资助

摘要: 研制了真空紫外光电离飞行时间质谱仪，用于研究大气自由基化学反应。采用光子能量为10.6 eV的真空紫外放电灯作为电离源，利用新型笼式离子引出装置，实现了离子的高效率传输和聚焦。结果表明，仪器的检测灵敏度可达到0.03 μg/L。结合微波放电流动管反应器模拟大气化学中的气相自由基反应，并通过自由基自反应动力学实现了CH₃浓度的定量分析。另外，利用真空紫外光电离飞行时间质谱仪，对CH₃+NO自由基反应的动力学进行了研究，检测了反应中的产物信息，测得其在室温和300 Pa压力下的反应速率常数为k（CH₃+NO）=1.2×10^-12 cm³/（molecule·s）。

关键词:

English

A Vacuum Ultraviolet Photoionization Time-of-Flight Mass Spectrometer for Investigation of Free Radical Reaction

1.
Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China;
2.
Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230026, China;
3.
School of Environmental Science and Optoelectronics Technology, University of Science and Technology of China, Hefei 230026, China
Received Date: 15 October 2019
Revised Date: 01 November 2019
Fund Project:
This work was supported by the National Natural Science Foundation of China (Nos. 21773249, 91644109, 91544228) and the Chinese Academy of Sciences (No. 116134KSB20170048).

Abstract: A home-made vacuum ultraviolet (VUV) photoionization time-of-flight mass spectrometer (VUVPI-TOFMS) was assembled to study atmospheric radical reactions. In the work, a commercial VUV discharge lamp with photon energy at 10.6 eV was installed as light source and a cage-shaped photoionization source was employed to efficiently extract and focus ions. With this spectrometer, a limit of detection (LOD) of 0.03 μg/L (S/N=3) for benzene detection was obtained. Then a microwave discharge flow tube was employed as reactor to produce free radicals and model their atmospheric reactions. The concentration of the methyl radical was measured with its self-reaction kinetics within the flow tube. As a representative example, the reaction of CH₃ and NO was investigated by VUVPI-TOFMS. Both the stable species and radicals involved in the reaction were probed and the reaction rate constant at room temperature and 300 Pa pressure was measured to be k(CH₃+NO)=1.2×10^-12 cm³/(molecule·s).

Key words:

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用于自由基化学反应研究的真空紫外光电离飞行时间质谱仪

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A Vacuum Ultraviolet Photoionization Time-of-Flight Mass Spectrometer for Investigation of Free Radical Reaction

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