Chemical ionization mass spectrometer for selectively controlling reaction ions

Abstract

The invention discloses a chemical ionization mass spectrometer for selectively controlling reaction ions, which comprises an ion source, a reaction ion selecting cavity, a chemical ionization reaction cavity and a mass spectrum detecting cavity, wherein the ion source is used for generating mixed ions; a certain ion in the mixed ions can selectively pass through the reaction ion selecting cavity; two parallel-plate electrodes are arranged in the reaction ion selecting cavity; and the parallel-plate electrodes are connected with a controllable radio-frequency power supply. According to the chemical ionization mass spectrometer provided by the invention, the mixed ions are separated by controlling radio-frequency voltage alternating current components loaded on the parallel-plate electrodes and a direct current component is utilized to select one ion, so as to realize the selective control on the passing of any ion; the ion enters the chemical ionization reaction cavity and is served as the reaction ion for chemical ionization, so as to realize the ionization on a to-be-detected object and detect in the mass spectrum detecting cavity; the chemical ionization mass spectrometer provided by the invention can work under atmosphere pressure and has the characteristics of simplicity in technology and low cost; various reaction ions are selectively controlled and the scope of materials detected by the chemical ionization mass spectrometer is expanded; and the identifying analytical capability of an instrument on unknown samples is increased.

Description

technical field [0001] The invention relates to the field of mass spectrometry, in particular to a chemical ionization mass spectrometer for selecting and controlling reaction ions. Background technique [0002] Chemical ionization mass spectrometry based on selective control of reactive ions mainly includes selected ion flow tube mass spectrometry, selected ion proton transfer reaction mass spectrometry and ion-molecular reaction mass spectrometry, etc., which can be used in many fields such as environmental pollution, national security, medical auxiliary diagnosis, food safety, etc. The rapid detection and monitoring of trace organic matter, therefore, research on this technology has attracted much attention in recent years. Selected ion chemical ionization mass spectrometry is favored for the following reasons: soft ionization, high sensitivity, fast analysis speed, reliable qualitative and quantitative, variable detection range, and broad application potential in gas / liq...

AI Technical Summary

Problems solved by technology

This method is simple, convenient, and low in cost, but it is only effective for a few kinds of reaction ions at present, and most of the gases produced by discharge or irradiation are mixed ions containing impurities; in addition, due to the discharge gas in the instrument Due to the memory effect and the difference in discharge conditions, it is difficult to achieve fast switching between reactive ions in this way

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