Citation: 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. doi: 10.3724/SP.J.1096.2012.20403 shu

Development of a Miniature High Resolution Electron Impact Ion Source Time-of-Flight Mass Spectrometer

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¹ The Institute of Physics and Mechanical & Electrical Engineering, The laboratory of Analysis Instrument, Xiamen University, Xiamen 361005, China;

Corresponding author: HE Jian,
Received Date: 17 April 2012
Available Online: 23 May 2012
Fund Project: 本文系中央高校科研业务费(No.2010121042)资助项目 (No.2010121042)

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.
- Gas analysis mass spectrometer,
- Electron impact ion source,
- Mass resolution,
- Time-of-flight mass spectrometer
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沈阳化工大学材料科学与工程学院沈阳 110142