Development of Ion Removal Device for Time-of-Flight Mass Spectrometry

MAI Ze-bin; SU Hai-bo; TAN Guo-bin; HUO Lei; LI Lei; HUANG Zheng-xu; GAO Wei; ZHOU Zhen

doi:10.7538/zpxb.2018.0047

Journal of Chinese Mass Spectrometry Society > 2019 > 40(2): 189-196. > DOI: 10.7538/zpxb.2018.0047 CSTR: 32365.14.zpxb.2018.0047

MAI Ze-bin, SU Hai-bo, TAN Guo-bin, HUO Lei, LI Lei, HUANG Zheng-xu, GAO Wei, ZHOU Zhen. Development of Ion Removal Device for Time-of-Flight Mass Spectrometry[J]. Journal of Chinese Mass Spectrometry Society, 2019, 40(2): 189-196. DOI: 10.7538/zpxb.2018.0047

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Development of Ion Removal Device for Time-of-Flight Mass Spectrometry

MAI Ze-bin^1,2,
SU Hai-bo²,
TAN Guo-bin^1,2,
HUO Lei¹,
LI Lei^1,3,
HUANG Zheng-xu^1,3,
GAO Wei^1,3,
ZHOU Zhen^1,3

1.
Institute of Mass Spectrometer and Atmospheric Environment, Ji’nan University, Guangzhou 510632, China
2.
Guangzhou Hexin Instrument Co., Ltd., Guangzhou 510530,China
3.
Guangdong Provincial Engineering Research Center for On-line Source Apportionment System of Air Pollution, Guangzhou 510632, China

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Abstract

A pulsed electric field device for selective removal of target ions at the front of the ion detector for a time-of-flight mass spectrometer was introduced. The pulsed electric field device had three grid meshes: MCP grid mesh, pulse grid mesh and ACCE grid mesh. The effective removal of the non-target ions was achieved by adjusting the pulse voltage and its width on pulse grid mesh to impede the non-target ions reaching the ion detector, in order to reduce the consumption of ion detector and prolong the life time of the ion detector. The experimental results showed that the pulsed electric field device could remove one or more interval ions through changing pulse voltage to adjust the removal rate and changing pulse width to adjust the removal span range. Except for spectral signal oscillations caused by the rising and falling edges of the pulse for neighbor ions, the device could effectively remove the non-target ions, and kept the other target ions stable. This specific ion removal method can provide an easy way to improve the existing TOF MS instruments.
- ion detector,
- removal pulse,
- ion selection,
- time-of-flight mass spectrometry

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