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Time domain enhanced ion migration tube

A technology of ion transfer tube and ion gate, which is applied in the field of ion transfer tubes, can solve the problems of limited range of analyzable ion mobility and inability to analyze and detect ions, and achieve the effect of high transfer electric field strength and good analysis performance

Pending Publication Date: 2021-03-12
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

However, this technology only applies an electric field on a part of the migration area, and the mobility range of the analyzable ions is limited, and it is impossible to analyze and detect all ions in the migration area.

Method used

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Embodiment 1

[0027] The time-domain electric field-enhanced ion transfer tube disclosed in the present invention is as figure 1 shown. The ion source 1 of the ion transfer tube is a 10.6eV VUV photoionization source, and acetone is used as a dopant in the ion source; the ion gate 3 is a Tyndall-Powell type ion gate composed of double parallel grids; the ion receiving electrode 5 is 6 mm in diameter The Faraday disk is fixed on a metal shielding cylinder with an outer diameter of 30mm; the ionization zone 2 and the migration zone 4 are composed of a ring-shaped conductive electrode piece 6 with a thickness of 1mm, an inner diameter of 20mm, and an outer diameter of 30mm and a thickness of 4mm, an inner diameter of 20mm, and an outer diameter of 30mm. The ring-shaped insulating pole pieces 7 are stacked alternately, the ionization zone 2 contains six ring-shaped conductive electrode pieces 6, and the migration zone 4 contains six ring-shaped conductive electrode pieces; along the direction f...

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Abstract

The invention discloses a time domain electric field enhanced ion migration tube. The time domain multistage enhancement of electric field intensity in a migration region is realized by controlling optocoupler switches in the ion migration tube. In a time interval when an ion gate is opened for ion group injection, all the optocoupler switches are in an off state, and an initial migration electricfield is maintained in the ion migration tube; after the ion gate completes ion group injection, the optocoupler switches are converted from an off state to an on state in sequence according to a specific time sequence, a time domain enhanced migration electric field is formed in the ion migration region, and multi-stage compression and enhancement are performed on the time domain width and the current density of an ion group in the ion migration region; and finally, an ion mobility spectrogram with ultrahigh resolution capability and ultrahigh sensitivity is formed. According to the design of the ion migration tube, a high-voltage power supply with a lower maximum output voltage value can be utilized to obtain the ultrahigh resolution capability and ultrahigh sensitivity analysis performance, so that the instrument cost is reduced, and the use safety of an instrument is improved.

Description

technical field [0001] The invention relates to an ion transfer tube, the core component of an ion mobility spectrometer, specifically an ion transfer tube that electrically shorts two adjacent conductive electrodes in an ionization region according to a specific time sequence, so as to realize ion migration in which the electric field strength in the transfer region is enhanced in time domain Tube. Background technique [0002] Ion Mobility Spectrometry (IMS) is a pulsed ion cluster separation and detection technique similar to time-of-flight mass spectrometry. The time-domain width and ion current density of ion clusters directly determine the resolving power and detection sensitivity of ion mobility spectrometry analysis. [0003] Published studies have shown that the ion migration electric field whose intensity jumps in time domain can effectively reduce the time domain width of ion clusters and increase the ion current density. Du Yongzhai et al. (Anal.Chem.2012, 92, ...

Claims

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Application Information

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IPC IPC(8): H01J49/06H01J49/00
CPCH01J49/0031H01J49/062
Inventor 陈创厉梅蒋丹丹肖瑶李海洋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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