Migration tube and ion mobility spectrometer with migration tube for axial focusing under atmospheric pressure

Abstract

The invention discloses a migration tube and an ion mobility spectrometer with the migration tube for axial focusing under atmospheric pressure. The migration tube comprises an outer wall, wherein the outer wall comprises electrode rings and insulating rings, which are arranged at intervals; the inner diameters of an inlet and an outlet are kept consistent; the insulating rings wrap the electrode rings; symmetrical drift air inlets are arranged in the outer wall of one end, close to the outlet; a focusing electrode is arranged in the migration tube and is coaxial with the migration tube; and an axial hole is arranged in the middle of the focusing electrode. The ion mobility spectrometer with the migration tube for axial focusing under the atmospheric pressure comprises a straight migration part, the migration tube and a mass spectrometer which are sequentially connected; an ion gate is arranged at the connected part of the straight migration part and the migration tube; and set voltage is applied to the migration tube. Ion axial focusing is achieved by optimizing parameters of the migration tube, applying certain voltage to the electrode and arranging the focusing electrode with the hole on the outer side; and the number of ions passing through the hole is increased, so that the mass spectrometry detection performance and sensitivity are improved.

Description

technical field [0001] The invention relates to the technical field of instrumental analysis, in particular to a transfer tube and an axially focused ion mobility spectrometer under atmospheric pressure with the transfer tube. Background technique [0002] Ion mobility spectrometry (IMS) is a separation technique based on the difference in the migration speed of gas-phase ions in an electric field to characterize chemical ion substances. It has the characteristics of fast separation speed, high sensitivity, simple structure, and high reliability. It is widely used in the fields of explosive detection, chemical warfare reagent detection, drug analysis and volatile chemical analysis, biological macromolecules, etc. In addition, ion mobility spectrometry has a good effect on the detection of positive and negative ions and the separation of isomers. selective. Since there is no need to use a vacuum, ion mobility spectrometry at atmospheric pressure has a simple structure, and h...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the above problems, to provide a transfer tube and an axially focused ion mobility spectrometer with the transfer tube under atmospheric pressure, which improves the focusing performance of the ion transfer tube and solves the problem of ion mobility caused by Coulombs during the movement of ions. Repulsion causes ion expansion, ion diffusion, etc., resulting in low ion utilization

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