Radio-frequency discharge VUV composite ionization source used for mass spectrometry

A vacuum ultraviolet light source and vacuum ultraviolet light technology, applied in the field of ionization sources, can solve the problems of complex vacuum systems, high manufacturing costs, and unusability, and achieve the effects of broad application prospects, compact structure, and small size
CN104716008AInactive Publication Date: 2015-06-17DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
5 Cites 14 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Publication Date
2015-06-17
Estimated Expiration
Not applicable Β· inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
Patent Text Reader

Abstract

The invention relates to an ionization source, in particular to a composite ionization source which comprises a VUV single-photon ionization source based on radio-frequency voltage discharge and a chemical ionization source obtained by utilizing photoelectron ionization reagent gas in the photoelectric effect. The composite ionization source comprises a radio-frequency VUV source, an ion transmission optical system and an ion source cavity. An ion repulsing electrode, an ion focusing electrode and a difference interface electrode plate are sequentially arranged in the VUV source emergent direction of radio-frequency discharge, the three electrodes are all round sheet electrodes with round holes in the centers, and the three electrodes are spaced through insulation pads and are coaxially arranged in parallel. The VUV light beam of the radio-frequency voltage discharge and coaxial light beams of all the round sheet electrodes penetrate through the center holes of all the electrodes in the axis direction, and finally the beams are irradiated on the surface of the difference interface electrode plate. Chemical ionization is acted on the photoelectrons after reagent gas is added. Soft ionization of sample molecules with ionization energy higher than the photon energy is achieved, the range of analyzable samples is enlarged, and the detection sensitivity of instruments is improved.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to an ionization source, in particular to a radio frequency discharge vacuum ultraviolet light composite ionization source for mass spectrometry analysis. Background technique

[0002] Volatile organic compounds and semi-volatile organic pollutants are very low in the atmosphere, but most of them have pathogenic and carcinogenic effects. Therefore, the monitoring of organic pollutants has been widely concerned by people. Mass spectrometry has good universality and high sensitivity, so online mass spectrometry has become a key development direction for rapid and highly sensitive detection of organic pollutants in recent years. 70eV electron beam bombardment ionization is currently the most widely used mass spectrometry ionization source in the detection of volatile organic compounds. Electron beam bombardment ionization uses thermal electron emission. The electron beam bombardment ionization filament area needs to be heated to 300 ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More