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Improving the efficiency of soft electron ionization by using the oscillatory movement of electrons

Autorzy
Huang Ze-Jian , Jiang You , Dai Xin-Hua , Zhou Ming-Fei , Fang Xiang
Treść / Zawartość
Pełne teksty:
Huang_Improving_MMS_2_2024.pdf
Identyfikatory
DOI
10.24425/mms.2024.149696
Języki publikacji
EN
Abstrakty
EN
In process analytical chemistry, mass spectrometry analysis using a soft electron ionization (EI) source has qualitative advantages. However, the relatively small ionization cross-section of soft EI leads to lower sensitivity. To address this issue, a novel method has been developed to enhance the sensitivity of soft EI by utilizing a dual electron repeller and an ionization chamber to form a U-shaped electric field, causing electrons to oscillate within the field and effectively increasing the electron collision cross-sectional area. By combining with an electron lens, the virtual cathode effect at low electron energy can be reduced or even eliminated, thereby improving ionization efficiency. This method has resulted in a significant increase in signal intensity for m/z 18(H2O), with a factor of 4.2 at an electron energy of 25 eV and a factor of 3.75 at 20 eV, compared to the electron receiving mode. Additionally, it reduces the required emission current, which is beneficial for prolonging the life of the filament. The proposed technique is expected to expand the application of soft EI, particularly for rapid online analysis in process analytical chemistry such as catalyst research and chemical reaction process monitoring.
Słowa kluczowe
EN
Wydawca
Komitet Metrologii i Aparatury Naukowej PAN
Czasopismo
Metrology and Measurement Systems
Rocznik
2024
Tom
Vol. 31, nr 2
Strony
353--367
Opis fizyczny
Bibliogr. 49 poz., rys., tab., wykr.
Twórcy
autor
Huang Ze-Jian
huangzj@nim.ac.cn
  • National Institute of Metrology, 18, Beisanhuandonglu, Chaoyang District, Beijing, 100029, P.R. China
autor
Jiang You
  • National Institute of Metrology, 18, Beisanhuandonglu, Chaoyang District, Beijing, 100029, P.R. China
autor
Dai Xin-Hua
  • National Institute of Metrology, 18, Beisanhuandonglu, Chaoyang District, Beijing, 100029, P.R. China
autor
Zhou Ming-Fei
  • Fudan University, Department of Chemistry Jiangwan Campus, HuaXue Building A3002, Shanghai, 200433, P.R. China
autor
Fang Xiang
  • National Institute of Metrology, 18, Beisanhuandonglu, Chaoyang District, Beijing, 100029, P.R. China
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Uwagi
This work is supported by the National Key R&D Program of China (No. 2021YFF0600202, 2016YFF0102603, 2017YFF0206204, and 2018YFF0212503).
Identyfikator YADDA
bwmeta1.element.baztech-582b2cd2-e01d-488e-bee6-7f51d8f6cb29