Combined ionization source based on vacuum ultraviolet lamp and discharge ionization

A technology of vacuum ultraviolet lamp and ionization source, which is applied in the field of mass spectrometry ion source, can solve the problems of limited application range, low sensitivity of vacuum ultraviolet lamp, low power consumption, etc., and achieves the effects of high discharge efficiency, favorable ionization, and low energy consumption

Inactive Publication Date: 2015-06-17
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] In recent years, vacuum ultraviolet lamps have been used as ionization sources for mass spectrometry, and have attracted attention due to their small size, low power consumption, and simple spectra. However, vacuum ultraviolet lamps have limited their application range due to their low sensitivity.

Method used

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  • Combined ionization source based on vacuum ultraviolet lamp and discharge ionization

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Embodiment 1

[0024] figure 1 The middle capillary A1 has a length of 1 mm and an inner diameter of 100 μm, and the capillary B3 has a length of 0.2 m and an inner diameter of 250 μm. The cavity 4 is maintained at a vacuum of 0.1Pa-50Pa by a molecular pump. The air pressure of the discharge chamber 2 is 600pa. Place the capillary A1 in the He gas, under the action of the air pressure difference, the He gas reaches the discharge chamber 2 through the capillary A1, and then reaches the ionization region 5 of the chamber 4 through the capillary B3.

[0025] When a high radio frequency voltage (frequency 25KHz, peak-to-peak value 3000V) is applied on the electrode head 8 of the discharge chamber 2, the He gas in the discharge chamber 2 will generate a discharge, generating a large number of ions and electrons. Since the air pressure of the chamber 4 is lower than the air pressure of the discharge chamber 2 . The ions in the discharge chamber 2 reach the ionization region 5 of the chamber 4 t...

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Abstract

The invention provides a combined ionization source based on a vacuum ultraviolet lamp and discharge ionization, and particularly relates to that plasma generated by the discharge ionization is guided into the position under the vacuum ultraviolet lamp through a capillary tube, and molecular ionization is conducted on the sample under the radiation of the ultraviolet lamp. The combined ionization source based on the ultraviolet lamp and the discharge ionization comprises the capillary tube, a discharging cavity, the vacuum ultraviolet lamp, an ion transmission area, a cavity body and an ion mass analyzer. The combined ionization source based on the ultraviolet lamp and the discharge ionization has the advantages that the plasma generated by the discharge ionization is guided into an ionization area through the capillary tube, and formed metastable atoms and ions can conduct molecular ionization on the sample in the ionization area; meanwhile, the air pressure in a discharge area is controlled by adjusting the length of the capillary tube. The combined ionization source based on the ultraviolet lamp and the discharge ionization has the advantages of being high in ionization efficiency and low in energy consumption.

Description

technical field [0001] The invention mainly relates to the field of mass spectrometry ion sources, specifically, the plasma generated by discharge ionization is introduced into the ionization region through a capillary, and sample molecules are ionized under the irradiation of VUV. Background technique [0002] In the space of high electric field strength, free electrons collide with atoms (or molecules) in the gas and ionize them to form new electrons and ions. The electrons produced by ionization continue to accelerate, and then ionize to produce new ions and electrons. Such a cycle forms a discharge and generates a large number of electrons and ions. Discharge ionization has the characteristics of high ion efficiency and high density. When the discharge gas is a rare gas or a diatomic gas molecule, it has the characteristic of a single ion composition. [0003] Chemical ionization is the use of ions to react with sample molecules to ionize the sample molecules. Theref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J49/10
Inventor 李海洋赵无垛王卫国窦健谢园园蒋蕾苏明扬
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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