Novel electronic gun

Abstract

A novel electronic gun comprises a shielding cylinder (1), a ceramic lead base (2), a filament (3), a pull-out electrode plate (4), a grounding electrode plate (5) and an ion lens (6). The shielding cylinder (1) is arranged outside, the ceramic lead base (2) is arranged at the bottom of the shielding cylinder (1) and connected with the filament (3), and the pull-out electrode plate (4), the ion lens (6) and the grounding electrode plate (5) are arranged at the front end of the filament (3) in sequence. After an external power supply is connected to the filament (3), electrons are emitted and converge to form a focal zone after passing through the ion lens (6). A focus point of an electron beam can be adjusted through the lens, energy of the electron beam can be adjusted through the voltage of the filament, and strength of the electron beam can be adjusted through the pull-out electrode plate, so that compounds can be ionized easily. Furthermore, the novel electronic gun is simple in structure, small and exquisite.

Description

technical field [0001] The invention relates to the field of ion sources, in particular to a novel electron gun. Background technique [0002] The electron gun is the electron injector of the electron source. It can emit an electron beam with a certain energy, a certain current intensity, a certain beam diameter and an emission angle. It is an important part of the mass spectrometer. The electron beam emitted by the electron gun ionizes the molecules entering the electron source and turns them into fragment ions and neutral particles with smaller masses. The current intensity and the focus of the electron beam determine the degree of ionization. At present, the electron guns commonly available in the market can emit a maximum current of 1mA, but the focus point of the electron beam cannot be adjusted, the intensity of the electron beam cannot be adjusted in a wide range, and the energy of the electron beam cannot be adjusted in a wide range, so some compounds cannot be fully...

AI Technical Summary

Problems solved by technology

At present, the electron guns commonly available in the market can emit a maximum current of 1mA, but the focus point of the electron beam cannot be adjusted, the intensity of the electron beam cannot be adjusted in a wide range, and the energy of the electron beam cannot be adjusted in a wide range, so some compounds cannot be fully ionized. , affecting the sensitivity of the experiment

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