Citation: Zhou Lijuan, Jiang Jichun, Zhao Kun, Li Jinxu, Wu Chenxin, Li Haiyang, Tian Di, Hou Keyong. Radiofrequency field enhanced chemical ionization with vacuum ultraviolet lamp for miniature time-of-flight mass spectrometer[J]. Chinese Chemical Letters, ;2018, 29(5): 707-710. doi: 10.1016/j.cclet.2017.11.021 shu

Radiofrequency field enhanced chemical ionization with vacuum ultraviolet lamp for miniature time-of-flight mass spectrometer

Zhou Lijuan ^a ,
Jiang Jichun ^b ,
Zhao Kun ^b ,
Li Jinxu ^b ,
Wu Chenxin ^b,c ,
Li Haiyang ^b ,
Tian Di ^a,, ,
Hou Keyong ^b,,

a.
College of Instrumentation & Electrical Engineering, Jilin University, Changchun 130023, China
b.
Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
c.
University of Chinese Academy of Sciences, Beijing 100039, China

Corresponding author: Tian Di, tiandi@jluedu.cn Hou Keyong, houky@dicp.ac.cn
Received Date: 14 September 2017
Revised Date: 13 November 2017
Accepted Date: 15 November 2017
Available Online: 20 May 2017

Figures(4)

It is difficult to rapidly and on-line detect trace volatile organic compounds for miniature mass spectrometry due to its limited sampling volume at slow pumping speed. In this paper, we developed a new radiofrequency field enhanced chemical ionization source (RF-ECI) with vacuum ultraviolet (VUV) lamp by coupling radiofrequency electric field and direct-current field together. The experiment results showed that the sensitivity of benzene, toluene, hydrogen sulfide and other compounds increased by 2-3 orders of magnitude under the introduction of RF-ECI comparing to traditional single photon ionization (SPI). At the same time, the reagent ion of O₂⁺ realized the charge transfer reaction chemical ionization, and the RF-ECI effectively expanded the detection range of the VUV lamp based SPI. The VUV lamp has inherent advantages in the on-site analytical instrument for its small size and low power consumption, and the VUV lamp based RF-ECI miniature time-of-flight mass spectrometer (TOFMS) has a limit-ofdetection for H₂S as low as 0.0571 mg/m³, and it is expected to be used widely in the field of on-site rapid analysis.
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