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小型高分辨电子轰击离子源反射式飞行时间质谱仪的研制
引用本文:何坚,黄如俊,李刚,唐紫超,林水潮.小型高分辨电子轰击离子源反射式飞行时间质谱仪的研制[J].分析化学,2012,40(10):1616-1621.
作者姓名:何坚  黄如俊  李刚  唐紫超  林水潮
作者单位:1. 厦门大学物理与机电学院,分析仪器实验室,厦门361005
2. 中科院大连化学物理研究所,大连,110623
3. 厦门大学化学化工学院,厦门,361005
基金项目:中央高校科研业务费(No.2010121042)资助项目
摘    要:常用的气体分析质谱仪使用四极杆质谱作为分析器,分辨率一般低于300,无法解决同质量数离子带来的干扰问题.本实验自行研制了一种小型高分辨气体分析质谱仪,它采用电子轰击离子源反射式飞行时间质量分析器.仪器腔体总长45 cm,在m/z 28的位置,质量分辨率达到3000(Full width at half maximum,FWHM),实现了CO和N2的半峰谷分离;在m/z 69的位置,仪器分辨率达到5000(FWHM).在直接大气压进样条件下,可以检测到空气中136Xe(含量7.8 μ g/m3)和80Kr(含量2.8 μg/m3).使用ADC采集时,仪器的动态范围为1 06.该仪器将作为高端气体质谱仪,应用于过程监测在线分析、环境有机挥发物研究、热分析质谱及催化反应监测等领域.

关 键 词:气体分析质谱仪  电子轰击离子源  质量分辨率  飞行时间质谱

Development of a Miniature High Resolution Electron Impact Ion Source Time-of-Flight Mass Spectrometer
HE Jian , HUANG Ru-Jun , LI Gang , Tang Zi-Chao , LIN Shui-Chao.Development of a Miniature High Resolution Electron Impact Ion Source Time-of-Flight Mass Spectrometer[J].Chinese Journal of Analytical Chemistry,2012,40(10):1616-1621.
Authors:HE Jian  HUANG Ru-Jun  LI Gang  Tang Zi-Chao  LIN Shui-Chao
Institution:1(The Institute of Physics and Mechanical & Electrical Engineering, The laboratory of Analysis Instrument,Xiamen University,Xiamen 361005,China) 2(The Institute of Chemistry and Engineer,Xiamen University,Xiamen 361005,China) 3(State Key Laboratory of Molecular Reaction Dynamics,Dalian Institute of Chemical Physics, Chinese Academy of Sciences,Dalian 116023,China)
Abstract:Since gas analysis mass spectrometers usually use quadrupole as the mass analyzer,the resolution is typically less than 300,and the same mass ions interference problem cannot be solved.This study developed a high resolution gas analysis mass spectrometer.Electron impact ion source reflection time-of-flight mass analyzer has been designed and tested.The length of vacuum chamber is only 45 cm.Mass resolution of 3,000(Full width at half maximum,FWHM) has been achieved at m/z 28,as a result,CO and N2 can be separated at the half peak height.The best resolution of instrument can reach 5000(FWHM) at m/z 69.At the condition of direct ambient air sampling,136Xe(7.8 μg/m3) and 80Kr(2.8 μg/m3) can be detected.The dynamic range is up to 106 with fast ADC acquiring system.This instrument can be used as a high-end gas mass spectrometer and applied to on-line gas analysis for process monitoring,environmental organic volatile compounds research,thermal analysis mass spectrometry and catalytic reaction monitoring.
Keywords:Gas analysis mass spectrometer  Electron impact ion source  Mass resolution  Time-of-flight mass spectrometer
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