An Atmospheric Pressure Chemical Ionization Source for Mass Spectrometry
A chemical ionization source and atmospheric pressure technology, applied in the field of ionization sources, can solve the problems of large differences in ionization efficiency
Active Publication Date: 2017-09-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
Generally, for different types of ionization sources, due to the difference in their own working principles, the ionization efficiency varies greatly
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[0026] See figure 1 , Is a schematic diagram of the structure of the present invention. The atmospheric pressure chemical ionization source for mass spectrometry of the present invention is composed of a reagent ion generating cavity 1, a chemical reaction zone 2, a repulsive electrode 7, a focusing electrode 8, a differential interface plate 9 and a differential interface small hole 10.
[0027] An ionization source is arranged inside the reagent ion generating chamber 1, and the reagent gas is ionized inside the reagent ion generating chamber 1 to generate charged reagent ions. A repelling electrode 7, a focusing electrode 8 and a differential interface electrode are sequentially arranged along the movement direction of the charged reagent ions. The plate 9 is provided with a polytetrafluoroethylene insulating pad 11 between the adjacent repulsion electrodes 7 or adjacent focus electrodes 8; between the repulsion electrode 7 and the focus electrode 8, and between the focus elec...
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The invention relates to an ionization source, specifically an atmospheric pressure chemical ionization source for mass spectrometry. The reagent gas enters the reagent ion generation chamber, and is ionized under the action of the ionization source to generate charged reagent ions. A repelling electrode, a focusing electrode and a differential interface plate are provided, and a polytetrafluoroethylene insulating pad is arranged between the repelling electrode, the focusing electrode and the differential interface plate to form a relatively airtight reagent ion transmission device. The ionization source is equipped with a purge gas and a tail gas pipe, so that neutral gas molecules such as metastable molecules are discharged through the tail gas pipe, and only charged reagent ions enter the chemical reaction area, avoiding the interference of ionization, and ensuring that the charged reagent ions and the sample The ions react in an environment without any impurities to obtain pure product characteristic ions, which are pulled by the electric field and enter the mass spectrometer through the through hole in the middle of the pole piece and the small hole in the differential interface for detection.
Description
Technical field [0001] The invention relates to an ionization source, specifically an atmospheric pressure chemical ionization source for mass spectrometry. In this ionization source, combined with the role of purge gas and the setting of the tail gas pipe, it provides an environment without any interference of impurity ions for the chemical reaction between charged reagent ions and sample gas molecules, thereby obtaining pure product characteristic ions into TOFMS Perform testing. Background technique [0002] The ionization source is an important part of TOFMS and one of the most important factors affecting the sensitivity of mass spectrometry. Generally, for different types of ionization sources, their ionization efficiency varies greatly due to their own working principles. The traditional and commonly used electron bombardment ionization source, which uses 70eV energy electrons to bombard the substance, ionize it, and obtain the characteristic spectrum of the substance; va...
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IPC IPC(8): H01J49/16H01J49/26
Inventor 李海洋李庆运花磊蒋吉春齐雅晨
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI