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Two-area reverse airflow atmospheric pressure chemical ionization source

A chemical ionization source and ionization source technology, applied in the field of mass spectrometry ionization sources, can solve problems such as affecting the sensitivity of the instrument, and achieve the effects of reducing the impact, reducing the formation, and improving the airflow velocity

Inactive Publication Date: 2015-12-30
ZHENGZHOU TOBACCO RES INST OF CNTC
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AI Technical Summary

Problems solved by technology

[0009] In traditional atmospheric pressure chemical ionization, there is only one ionization area, and the glow discharge and sample ionization are in the same area, and the electron-abstracting competition reaction between sample molecules and nitrogen oxides affects the sensitivity of the instrument

Method used

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  • Two-area reverse airflow atmospheric pressure chemical ionization source
  • Two-area reverse airflow atmospheric pressure chemical ionization source
  • Two-area reverse airflow atmospheric pressure chemical ionization source

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Embodiment Construction

[0023] The present invention is described as follows to its structure below in conjunction with accompanying drawing:

[0024] Such as figure 1 Shown: a dual-zone reverse airflow atmospheric pressure chemical ionization source, including an ionization source chamber 2, a discharge needle 1 set in the upper part of the ionization source chamber, a sample inlet 9 set on the wall of the ionization source chamber, and a lower part of the ionization source chamber The mass spectrometry sampling cone 4, a sealing ring 3 is provided between the lower end surface of the ionization source cavity and the upper surface of the mass spectrometry sampling cone, wherein: the ionization source cavity is divided into upper and lower parts by a partition 7, the upper part It is the discharge area 5, and the lower part is the ionization area 6, and the discharge area and the ionization area are connected through the small hole 11 in the center of the separator, and a gas discharge port 8 is open...

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Abstract

A two-area reverse airflow atmospheric pressure chemical ionization source comprises an ionization source cavity, a discharge needle, a sample inlet and a mass spectrum sample entering conical port and is characterized in that the ionization source cavity is divided by a partition board into an upper part and a lower part, the upper part is a discharging area, the lower part is an ionization area, the two areas are communicated through a center small hole of the partition board, a gas exhaust port is formed in the discharging area, and a gas blowing inlet is formed in the ionization area. The ionization process includes the steps that sample gas enters the ionization area from the sample inlet, part of the sample gas reaches the discharging area through the small hole formed in the middle of the ionization source cavity and then is exhausted through the gas exhaust port, and the other part of the sample gas enters an online mass spectrum through the conical port. Discharging happens between the discharging needle and the small hole of the ionization source cavity, reagent ions generated during discharging are introduced into the ionization area through a strong electric field, and the sample gas and the reagent ions are ionized in the ionization area. Neutral products generated during discharging can be easily blown by airflow of the small hole of the ionization source cavity, and therefore the neutral products flowing to the ionization area are reduced, and influences of the neutral products generated in the discharging process on ionization of sample molecules are reduced.

Description

technical field [0001] The invention relates to a mass spectrometer ionization source, in particular to a double-zone reverse flow atmospheric pressure chemical ionization source. Background technique [0002] Due to its high sensitivity, good specificity, fast response and other advantages, mass spectrometry technology has attracted much attention in many modern analysis and detection technologies. Since its development in the early 20th century, mass spectrometry technology has achieved perfection and maturity through continuous innovation. Tandem mass spectrometry The emergence of technology has made characterization more accurate. In recent years, the new soft ionization technology, especially the atmospheric pressure ionization source, has opened up a new era of ionization technology, and the combination of soft ionization and mass spectrometry technology has made new developments in online detection technology. [0003] Among them, Atmospheric pressure chemical ioniza...

Claims

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Application Information

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IPC IPC(8): H01J49/10G01N27/68
Inventor 赵无垛卢斌斌刘俊辉孙世豪王丁众张启东宗永立张建勋
Owner ZHENGZHOU TOBACCO RES INST OF CNTC
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