Discharging device and method applied to ion source

Abstract

The invention provides a discharging device and method applied to an ion source. The discharging device comprises a hollow container and further comprises a discharging needle, a discharging cavity and a power supply, wherein the discharging needle is arranged in the container and comprises a pointed part and a rear part, an axial hole and radial holes are formed in the rear part, the axial hole is communicated with the radial holes, the radial holes are evenly distributed, the discharging cavity is cylindrical and is formed in one side of the discharging needle in the container, the pointed part stretches into the discharging cavity, the axial section of the discharging cavity is composed of two symmetrical sides, the side, adjacent to the axis, of the section is a curve, the discharging cavity is grounded, and the power supply is formed by introducing high voltage between the discharging needle and the discharging cavity. The discharging device and method applied to the ion source have the advantages that stability is high, sensitivity is high, and service life is long.

Description

technical field [0001] The invention relates to mass spectrometry, in particular to a discharge device and method used in ion sources. Background technique [0002] Among the conventional on-site ion sources under atmospheric pressure, one adopts the method of capillary discharge needle to directly intake air and generate discharge. Although this method is simple to install, it has high discharge voltage requirements and is easy to ignite. Secondly, the airflow jet is concentrated, and the ion jet Large, so it needs a long guide to annihilate ions, which also greatly reduces the number of high-energy particles and reduces the sensitivity of the ion source; in addition, it is introduced from the discharge chamber next to the discharge needle, which is easy to make the gas intake uneven. In addition Due to high-voltage insulation, the overall structure and installation design of the discharge chamber are complicated. At the same time, because the discharge needle is bombarded ...

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Problems solved by technology

[0002] Among the conventional on-site ion sources under atmospheric pressure, one adopts the method of capillary discharge needle to directly intake air and generate discharge. Although this method is simple to install, it has high discharge voltage requirements and is easy to ignite. Secondly, the airflow jet is concentrated, and the ion jet Large, so it needs a long guide to annihilate ions, which also greatly reduces the number of high-energy particles and reduces the sensitivity of the ion source; in addition, it is introduced from the discharge chamber next to the discharge needle, which is easy to make the gas intake uneven. In addition Due to high-voltage insulation, the overall structure and installation design of the discharge chamber are complicated. At the same time, because the discharge needle is bombarded by ions for a long time, the metal on the surface is sputtered and falls off with the wind, resulting in short service life of the discharge needle and frequent replacement.

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