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A Mass Spectrometry System That Can Improve Ion Detection Efficiency

A mass spectrometry and ion technology, applied in the field of mass spectrometry, can solve the problems of increasing the detection circuit, increasing the manufacturing cost, increasing the volume and power consumption of the mass spectrometer, and achieving the effect of economical miniaturization

Active Publication Date: 2017-07-25
CHINA INNOVATION INSTR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this ion detection method is not suitable for miniaturized mass spectrometers, because it will greatly increase the size and power consumption of the mass spectrometer, and the detection circuit will also multiply, and it will also increase the manufacturing cost.
Therefore, in all the linear ion trap mass spectrometers with simplified structures that have been reported, only one electron multiplier is used for ion detection. The theoretical maximum ion detection efficiency of this detection method is only 50%, and the actual ion detection efficiency is higher than less than the value

Method used

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  • A Mass Spectrometry System That Can Improve Ion Detection Efficiency
  • A Mass Spectrometry System That Can Improve Ion Detection Efficiency
  • A Mass Spectrometry System That Can Improve Ion Detection Efficiency

Examples

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Effect test

Embodiment 1

[0039] In order to better understand the asymmetric structure, a symmetric structure is first described below.

[0040] see figure 2 , figure 2 It is a structural schematic diagram of a semi-cylindrical columnar electrode linear ion trap with a symmetrical structure. Such as figure 2 As shown, the distance (R0) of the two pairs of columnar electrodes (X electrode and Y electrode) relative to the central axis 201 of the ion trap is equal.

Embodiment 2

[0042] see image 3 , image 3 It is a structural schematic diagram of a mass spectrometry system based on a linear ion trap with asymmetric semi-cylindrical electrodes. Such as image 3 As shown, it consists of two pairs of columnar electrodes (X electrodes 301, 302 and Y electrodes 303, 304) placed in parallel and a pair of end cap sheet electrodes (Z electrodes). The X electrodes 301, 302, Y electrodes 303 , 304 is a semi-cylindrical columnar electrode. The X right terminal electrode 304 is shifted to the right by Δr in the direction away from the central axis 310 of the ion trap, so that the distance from the central axis 310 of the original symmetrical structure is increased to R0+Δr, forming an asymmetric linear ion trap. Ion extraction slots 311 , 312 , 313 , 314 are located in the center of the semi-cylindrical columnar electrode, and the width of the ion extraction slots 311 , 312 , 313 , 314 is between 0.3 mm and 2 mm. The end cap sheet electrodes (Z electrodes) ...

Embodiment 3

[0044] see Figure 4 , Figure 4 It is a structural schematic diagram of a mass spectrometry system based on an asymmetrical triangular columnar electrode linear ion trap. Such as Figure 4 As shown, it consists of two pairs of relatively parallel columnar electrodes (X electrodes 401, 402 and Y electrodes 403, 404) and a pair of end cap sheet electrodes (Z electrodes). The Z electrode structures in the three are the same, so Figure 4 The Z electrode is omitted in , and only a cross-sectional view of the system is given. The X electrodes 401 , 402 and Y electrodes 403 , 404 are triangular columnar electrodes with an isosceles triangle cross section and a vertex angle ranging from 90° to 180° (excluding 180°). The X right terminal electrode 404 is shifted to the right by Δr in the direction away from the central axis 410 of the ion trap, so that the distance from the central axis 410 of the original symmetrical structure is increased to R0+Δr, forming an asymmetric linear ...

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Abstract

The invention discloses a mass spectrometry system capable of improving the ion detection efficiency. The system comprises a linear ion trap and an electronic multiplier. The linear ion trap comprises two pair of cylindrical electrodes relatively placed in parallel and a pair of end cover thin slice electrodes, wherein ion extraction slots are formed in the centers of at least one pair of cylindrical electrodes. The distances between three of the two pairs of cylindrical electrodes and the central axis of the ion trap are equal, and are set to be R0. The other one of the two pairs of cylindrical electrodes is moved horizontally outwards away from the central axis of the ion trap to form a translation electrode. The distance between the central axis of the ion trap and the translation electrode is set to be R0+delta r. An ion extraction slot is formed in the center of the translation electrode. The electronic multiplier is arranged on the side of the electrode opposite to the translation electrode. The system improves the ion detection efficiency, meanwhile, miniaturization of the mass spectrometry system is promoted, and the system is more economic.

Description

technical field [0001] The invention belongs to the technical field of mass spectrometry, and in particular relates to a mass spectrometry analysis system of an asymmetric structure linear ion trap analyzer. Background technique [0002] Mass spectrometer is a representative of modern analytical instruments. Due to its strong qualitative and quantitative analysis capabilities, high detection sensitivity and low detection limit, mass spectrometer has become an indispensable analytical tool in many fields. At present, mass spectrometers have been widely used in environmental monitoring, food safety, medical testing, homeland security, aerospace and scientific research. [0003] According to the different mass analyzers used in mass spectrometers, mass spectrometers can be divided into magnetic mass spectrometers, Fourier transform-ion cyclotron resonance mass spectrometers, ion trap mass spectrometers, quadrupole mass spectrometers, and time-of-flight mass spectrometers. Amon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J49/42
CPCH01J49/4225
Inventor 李晓旭张在越袁广洲钱洁张曙光何洋姚如娇
Owner CHINA INNOVATION INSTR CO LTD
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