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Radio frequency focusing enhanced vacuum ultraviolet mass spectrometry ionization source

A technology of vacuum ultraviolet light and focusing enhancement, applied in mass spectrometers, dynamic spectrometers, circuits, etc., can solve problems such as difficult to meet high pressure, achieve compact structure, increase ion collision frequency, and enhance focusing effects

Active Publication Date: 2018-05-29
SHENZHEN BREATHA BIOTECHNOLOGY CO LTD
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Problems solved by technology

However, the RF quadrupole used for transmission generally works at 0.1-10Pa, which is difficult to meet the needs of high air pressure

Method used

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  • Radio frequency focusing enhanced vacuum ultraviolet mass spectrometry ionization source

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Embodiment Construction

[0019] see figure 1 , is a structural schematic diagram of the present invention, which includes an ionization source cavity 1, a vacuum ultraviolet lamp 2, an ion repelling electrode 3, a gas sampling tube 10, a segmented quadrupole rod 13, a vacuum sealing ring 4 and a differential electrode 7; its characteristics in:

[0020] The vacuum ultraviolet lamp 2 is placed inside the cavity 1 of the ionization source; the ion repelling electrode 3, the segmented quadrupole rod 13 and the differential electrode 7 are arranged in sequence along the light emission direction of the vacuum ultraviolet lamp 2, and the ion repelling electrode 3 and the differential electrode 7 They are all plate structures with a circular through-hole in the middle, and are placed in parallel and coaxially with the through-holes;

[0021] The optical axis of the light emitted by the vacuum ultraviolet lamp 14 is coaxial with the through hole in the middle of the ion repulsion electrode 3; the gas samplin...

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Abstract

The invention relates to a mass spectrometry instrument, in particular to a focusing enhanced ultraviolet ionization source based on a radio frequency segmented quadrupole rod for mass spectrometry. The ultraviolet ionization source specifically comprises an ionization source cavity, a vacuum ultraviolet lamp, a repulsion electrode, a gas injection tube, a segmented quadrupole rod and a differential electrode. The ionization source uses the quadrupole rod to improve the ion collision frequency at medium pressure. Therefore, the focusing and other properties are enhanced, the transmission efficiency of ions and the probability of molecular-ion reaction are improved, the ionization efficiency of the vacuum ultraviolet ionization source is enhanced, and the sensitivity of the instrument is greatly improved. Meanwhile, by introducing a segmented structure, a suitable axial electric field can be controlled, the reaction rate and dissociation can be controlled, and the selectivity of the ionization source can be improved.

Description

technical field [0001] The invention relates to a mass spectrometer analysis instrument, in particular to a radio frequency focusing enhanced vacuum ultraviolet photoionization source. Using the quadrupole to increase the ion collision frequency under medium pressure, enhance the focusing performance, improve the ion transmission efficiency and the probability of molecular ion reaction, and realize the enhancement of the ionization efficiency of the vacuum ultraviolet photoionization source, which can greatly improve the performance of the instrument. sensitivity. Background technique [0002] The vacuum ultraviolet lamp ionization source has the advantages of small size, low power consumption, high sensitivity, long life, and simple spectrum. It is suitable for complex sample analysis, online monitoring of samples, process monitoring and other fields. Vacuum ultraviolet light can softly ionize organic molecules whose ionization energy (IE) is lower than its photon energy, ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J49/06H01J49/42
CPCH01J49/063H01J49/4215
Inventor 李海洋蒋吉春刘巍王艳吴称心周丽娟
Owner SHENZHEN BREATHA BIOTECHNOLOGY CO LTD
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