A pulsed ion trap transfer tube with carrier gas and transfer gas

Abstract

The invention provides a pulsed ion trap transfer tube with carrier gas and transfer gas, which includes an insulating tube with one end set as an open type and the other end as a closed type. The set diaphragm, ionization source, single grid ion gate, transfer ring, shielding grid and Faraday disk; the side wall of the insulating tube between the diaphragm and the ionization source is provided with a carrier gas inlet; the ionization source and The side wall of the insulating tube between the single-grid ion gates is provided with an exhaust gas outlet; the side wall of the insulating tube between the shielding grid and the Faraday disk is provided with a migration gas inlet. The present invention can realize the coordinated detection of positive and negative ions by applying excitation electric fields with different properties on the ion trap, and adopts the mode of independent gas supply of carrier gas and migration gas, which overcomes the phenomenon of characteristic ion peak drift caused by too high concentration of sample molecules, At the same time, the technical problems of high product ion loss rate, poor spectrum stability and long analysis time of traditional transfer tubes are solved.

Description

technical field [0001] The invention relates to an ion transfer tube, in particular to a pulse ion trap transfer tube with carrier gas and transfer gas. Background technique [0002] Ion mobility spectrometer is an efficient and sensitive trace detection equipment, which can be used for rapid detection of drugs and explosives. Among them, the transfer tube is the core component of the ion mobility spectrometer. There are two types of traditional transfer tubes. One is the single gas path ion trap transfer tube (see US Patent 5200614). The formation and storage of product ions are completed in the ion trap, with The product ion formation efficiency is high, the loss rate is low, and the detection mode can be quickly switched. However, when the concentration of the detected sample molecules is high, limited by the ionization capacity of the ion trap, a large number of unionized sample molecules enter the migration area with the carrier gas. , causing the characteristic ion pe...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a pulsed ion trap transfer tube with carrier gas and transfer gas to simultaneously solve the technical problems of low detection accuracy, high sample ion loss rate and inability to quickly switch detection modes in the above-mentioned traditional ion transfer tube.

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