Atmospheric pressure magnetic enhancement and magnetic confinement DC glow discharge ion source

Abstract

The invention provides an atmospheric pressure magnetic enhancement and magnetic confinement DC glow discharge ion source whose ionization efficiency, ion transport efficiency, and work stability are increased on a larger scale. The atmospheric pressure magnetic enhancement and magnetic confinement DC glow discharge ion source is provided at the periphery of a cavity in the axial direction, closer to an air outlet and in deviation from a direct current discharge electrode with a pair of rectangular permanent magnets which are separated by the cavity, arranged in parallel and opposite to each other. The magnetic field B1 covers a direct current discharge area; the direction of the magnetic field B1 is perpendicular to the current J across the direct current discharge area and the J X B1 is along the air flowing direction; along the axial direction of the cavity, two annular permanent magnets of the same specifications are coaxially and sequentially arranged so that the two annular permanent magnets could form a uniform-magnetic field B2 which covers the direct current discharge area and the plasma jet area of the air outlet downstream; the direction of the uniform-magnetic field B2 is consistent with the axial directions of the cavity and the annular permanent magnets.

Description

technical field [0001] The invention relates to an atmospheric pressure gas discharge ion source generating device. Background technique [0002] The ion source is a device that utilizes external discharge, light radiation, and sputtering to ionize neutral atoms or molecules and extract ion beams from them. It is a key component of chemical composition detectors, environmental monitors and other equipment. Atmospheric pressure gas discharge ion source has been widely concerned by researchers at home and abroad because it is not limited by the vacuum environment, does not use chemical solvents, has little environmental pollution, is easy to operate, and has strong applicability. Atmospheric pressure gas discharge ion source, the common discharge methods include corona discharge, DC glow discharge, dielectric barrier discharge, hollow cathode discharge, and microwave discharge. to N 2 , He, Ar and other gases are used as the plasma maintenance gas, and the plasma generated ...

AI Technical Summary

Problems solved by technology

Although, after adding a pair of permanent magnets parallel to each other, the ionization efficiency of the atmospheric pressure magnetic field-enhanced low-temperature plasma brush generator in its discharge space has been improved, but if it is directly applied to chemical composition detection and environmental monitoring , due to the large volume of the plasma jet, only a very small part of the ions in the plasma jet can be collected to the inlet of the analytical instrument under the action of the airflow for qualitative or quantitative analysis of the components, resulting in no signal output from the analytical instrument

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