Electron bombardment ionization source device, ionization bombardment method and substance analysis method

Abstract

The embodiment of the invention provides an electron bombardment ionization source device, an ionization bombardment method and a substance analysis method, and the device comprises the steps: placinga pair of radial acceleration electrodes at the inner side, close to an ionization chamber, of a first electron repulsion electrode and at the upper and lower parts or the front and rear parts of a first filament, and forming an electric field perpendicular to a magnetic field direction between the radial acceleration electrodes; enabling electrons overflowing from the electrified and heated first lamp filament to move in a spiral line under the acting force in the magnetic field direction, wherein the radius of the spiral line where the electrons move is increased under the action of an electric field perpendicular to the magnetic field direction, and then the actual movement path of the electrons is increased. According to the device, the electric field perpendicular to the electron motion reference axis is added, under the action of the electric field, the radius of spiral line operation of electrons is increased, then the actual operation path of the electrons in the ionization chamber is increased, the collision sectional area of the electrons and measured object molecules is increased, and then the ionization efficiency of the ion source is improved.

Description

technical field [0001] The invention belongs to the field of electronic technology, and in particular relates to an electron bombardment ionization source device, an ionization bombardment method and a material analysis method. Background technique [0002] Electron impact ionization (EI) is a traditional ion source method for mass spectrometers. It utilizes thermionic emission and is accelerated by an electric field of a certain intensity so that it has a certain energy, and then collides with the molecules of the analyte, and through energy exchange, the molecules are ionized into molecular ions, and some molecular ions will be obtained because More energy, and will be further fragmented into fragment ions. These molecular ions and fragment ions are used as the fingerprints of molecules, which can be used as the basis for judging molecular structures, and have become a standard method. The fingerprints of these molecules have been established as a standard EI source stan...

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Problems solved by technology

[0007] However, for chromatography-mass spectrometry schemes, chromatographic separation takes time. Even if fast chromatography is used, the separation time is quantified in minutes. This is obviously not the best solution for applications that pursue analysis speed. best solution

Ultraviolet photoionization ion source technology has low ionization energy, so it hardly produces fragments, which has certain advantages for rapid analysis. However, compared with EI source, its ionization efficiency is lower, and its ionization energy is constant, so it cannot be used for analysis. Molecules with high ionization energy are ionized

Therefore, its application is also subject to certain restrictions

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