Ion migration tube with direct-current non-uniform electric field ion

A technology of ion transfer tube and non-uniform electric field, which is applied in the field of ion transfer tube to achieve the effect of improving detection sensitivity

Inactive Publication Date: 2019-11-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The diversity of detection objects also brings great challenges to the detection sensitivity of ion mobility spectrometry.

Method used

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  • Ion migration tube with direct-current non-uniform electric field ion
  • Ion migration tube with direct-current non-uniform electric field ion

Examples

Experimental program
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Embodiment 1

[0024] A DC non-uniform electric field ion transfer tube is a hollow cylindrical cavity, such as figure 1 shown in . The ion source 8 of the reaction ion generator and the Faraday disk 4 of the ion receiving device are respectively arranged at both ends of the chamber; the ion gate 2 is arranged between the ion source 8 and the Faraday disk 4 inside the chamber, and the inner part of the chamber is divided into two regions, The ionization zone 1 is formed between the ion source and the ion gate, and the migration zone 3 is formed between the ion gate and the Faraday disk; the ionization zone 1 is composed of five ring-shaped plate electrodes and four plate-shaped ring insulators alternately stacked.

[0025] The electric field inside the ionization zone 1 is composed of DC electric fields with the same direction and different strengths: along the direction from the ionization source 8 to the ion receiving electrode 4, a first direct current is applied between the first conduct...

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Abstract

The invention relates to an ion migration tube in an ion migration spectrometer, in particular to an ion migration tube with an internal electric field of an ionization region being a non-uniform direct-current electric field. The internal electric field intensity of the ionization region is non-uniformly distributed along the direction from an ion source to the ion gate. By means of the forming mode of the direct-current electric field, the difference of movement speeds of ions in direct-current electric fields with different intensities can be fully utilized, sample ion flow generated in theion source is subjected to space concentration, the concentration of sample ions in front of the ion gate is increased, and detection sensitivity of the ion migration spectrometry is improved on thepremise that response speed ofthe ion migration spectrometry is not affected.

Description

technical field [0001] The invention relates to the ion transfer tube technology of the ion transfer spectrum of an analysis instrument, in particular to a method for setting a non-uniform DC electric field in the ionization region of the ion transfer tube to improve its detection sensitivity. Background technique [0002] As the core technology for the detection of explosives, narcotics and chemical warfare agents, ion mobility spectrometry has always played a very important role. In recent years, with the invention and application of different atmospheric pressure ionization sources, the application field of ion mobility spectrometry has gradually expanded to many fields of analytical chemistry, including environmental safety, food safety, medical clinical monitoring and so on. The diversity of detection objects also brings great challenges to the detection sensitivity of ion mobility spectrometry. [0003] Du Yongzhai et al. (Anal.Chem., 2012, 84, 1725) proposed a compre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J49/02H01J49/06H01J49/10G01N27/62G01N27/622
CPCH01J49/06H01J49/02H01J49/10G01N27/624
Inventor 陈创李海洋陈红
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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