Atmospheric pressure chemical ionization source for mass spectrum

Abstract

The present invention relates to an ionization source, specifically to an atmospheric pressure chemical ionization source for mass spectrum. Reagent gas enters a reagent ion generation chamber and generates charged reagent ion under the action of the ionization source; and a repulsion electrode, a focusing electrode and a difference interface polar plate are arranged at the movement direction of the charged reagent ion, polytetrafluoroethylene insulation pads are disposed among the repulsion electrode, the focusing electrode and the difference interface polar plate to form a reagent ion transmission device relatively sealed. The ionization source is internally provided with sweeping gas and an exhaust pipe to exhaust neutral gas molecules such as metastable state molecules and the like from the exhaust pipe and allow the charged reagent ion to enter a chemical reaction zone so as to avoid the ionization interference and ensure the action generation of the charged reagent ion and sample ions without any impurities to obtain pure product characteristic ions, and the product characteristic ions enter the mass spectrum for detection through a through hole at the middle of the pole piece and a small hole of the difference interface.

Description

technical field [0001] The invention relates to an ionization source, in particular to an atmospheric pressure chemical ionization source for mass spectrometry. In this ionization source, by virtue of the role of the sweeping gas and the setting of the tail gas pipe, an environment without any interference of impurity ions is provided for the chemical reaction between the charged reagent ions and the sample gas molecules, so that the pure product characteristic ions enter the TOFMS to test. Background technique [0002] The ionization source is an important part of TOFMS and one of the most important factors affecting the sensitivity of mass spectrometry. Generally, for different types of ionization sources, due to their differences in their working principles, their ionization efficiencies vary greatly. Traditionally, there is an electron bombardment ionization source, which uses electrons with 70eV energy to bombard the material, ionizes it, and obtains the characteristi...

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Problems solved by technology

Generally, for different types of ionization sources, due to the differenc

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