Atmosphere interface ion source and mass spectrometer

Abstract

The invention provides an atmosphere interface ion source and a mass spectrometer. The atmosphere interface ion source comprises a capillary tube and a repulsion electrode, wherein one end of the capillary tube stretches into the mass spectrometer and the other end of the capillary tube is arranged in atmosphere; a sample ion flow is formed by sample ions by an air pressure difference between the inside of the mass spectrometer and the atmosphere and is sucked into the mass spectrometer through the capillary tube; an included angle alpha between the capillary tube and a mass analyzer of the mass spectrometer is 80-150 degrees; and the repulsion electrode is mounted at the outer side of the included angle alpha; direct-current voltage of 110-380 volts is applied to the repulsion electrode so that the flying direction of the sample ions with low kinetic energy in the sample ion flow passing through the capillary tube is changed for 180 degrees-alpha and the sample ions enter the mass analyzer. The mass spectrometer disclosed by the invention comprises the atmosphere interface ion source disclosed by the invention. According to the atmosphere interface ion source and the mass spectrometer, only the stable sample ions with the low kinetic energy can enter the mass analyzer and fog drop residues with the great kinetic energy and the like can be effectively separated. Therefore, the atmosphere interface ion source and the mass spectrometer has the advantages of high analysis precision, high sensitivity and high signal to noise ratio.

Description

technical field [0001] The invention relates to an atmospheric pressure interface ion source and a mass spectrometer used in the field of analytical instruments. Background technique [0002] Liquid chromatography-mass spectrometry system is widely used in the fields of scientific research and biological detection and analysis, and its structure mainly includes liquid chromatography and mass spectrometer. Among them, the liquid chromatograph is used to preliminarily process the liquid sample to be detected to form a relatively pure liquid sample. A mass spectrometer mainly includes an ion source with an atmospheric pressure interface and a mass analyzer. Atmospheric pressure interface ion source includes a charged injection needle, capillary and heating device for heating the capillary. The charged injection needle is set in the atmosphere and is used to receive the relatively pure liquid sample processed by the liquid chromatograph, and transfer the liquid to The sample i...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of atmospheric pressure interface ion source and mass spectrometer that does not affect the analysis precision and sensitivity, to solve the technical problem of low analysis precision and sensitivity caused by the defect of the atmospheric pressure interface ion source in the above-mentioned prior art

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