CN210668276U - Multi-section quadrupole rod electrode system - Google Patents
Multi-section quadrupole rod electrode system Download PDFInfo
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- CN210668276U CN210668276U CN201921395090.3U CN201921395090U CN210668276U CN 210668276 U CN210668276 U CN 210668276U CN 201921395090 U CN201921395090 U CN 201921395090U CN 210668276 U CN210668276 U CN 210668276U
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Abstract
The utility model discloses a multistage formula quadrupole rods electrode system, including at least two sets of adjacent quadrupole rods electrode assembly of placing: first electrode pole group and second electrode pole group, the characteristics are: the first electrode bar group consists of 4 identical electrodes, and the second electrode bar group consists of 4 identical electrodes. The first electrode and the adjacent corresponding second electrode are coaxially arranged; a first extending part and a second extending part which are partially overlapped are formed between the first electrode and the corresponding second electrode, and a gap is arranged between the first extending part and the second extending part. The utility model has the advantages that: the edge field effect generated between the two groups of quadrupole rod electrode systems due to the arrangement of the planar electrode can be avoided, the ion loss of the two quadrupole rod electrode systems in the transmission process is prevented, and the ion transmission efficiency is improved.
Description
Technical Field
The utility model relates to a mass spectrometry instrument technical field especially relates to a multistage formula quadrupole rod electrode system for improving ion transmission efficiency in quadrupole mass spectrum.
Background
The mass spectrometer has wide application in substance analysis and component identification, has the advantages of rapidness and accuracy, and can perform high-sensitivity analysis on chemical components. The basic working principle is as follows: firstly, ionizing detected substances into ions, separating different ions according to the mass-to-charge ratio (m/z) by an electric field or a magnetic field, and then detecting the separated ions by an ion detector to obtain a mass spectrogram. And the information such as chemical composition, structure, content and the like of the detected substance can be obtained by analyzing the mass spectrogram. In a mass spectrometer, a component that ionizes a substance is called an ion source, and a component that mass-analyzes ions is called a mass analyzer. The ion source and the ion mass analyser are two key components that make up the mass spectrometer.
The mass spectrometer has the characteristics of rapidness, high sensitivity, high quality resolution and the like, is one of the most widely applied analytical instruments in the world nowadays, and plays an increasingly important role in the hot spot fields of environmental detection, food safety, athlete illicit drug detection, pharmacy, disease diagnosis and treatment, proteomics, genomics, materials and the like. Moreover, the development of mass spectrometers has important implications for basic scientific research and for fields related to national security, such as national defense, aerospace, detection and maintenance of biological and chemical weapons, etc.
At present, the development of mass spectrometry technology is quite mature, and various novel mass spectrometry instruments are continuously emerged. A common goal to be achieved by all mass spectrometers is to achieve ionization of neutral species and then separate the ions by their mass-to-charge ratio. However, different types of mass spectrometers use different mass analysers, which also do not perform the ion mass to charge ratio separation in the same way. Mass spectrometers can be largely classified into the following according to the mass analyzer: magnetic mass spectrometers (using magnetic mass analyzers), time-of-flight mass spectrometers (using time-of-flight mass analyzers, TOF), quadrupole mass spectrometers (using quadrupole mass analyzers, QMF), Ion trap mass spectrometers (using Ion trap mass analyzers, Ion traps), fourier transform Ion cyclotron resonance mass spectrometers (using fourier transform mass analyzers, FT-ICR), orbital Ion trap mass spectrometers (using orbital Ion trap mass analyzers, Orbitrap), and the like. Different types of mass spectrometers have different characteristics and fields of application.
The mass spectrometry can not only obtain the information of molecular species and content in the sample, but also obtain the information of molecular structure, such as amino acid sequence in protein molecules, connection position and connection mode between each atom or group in organic macromolecules, and the like. This method of mass spectrometry for analyzing molecular structures is called tandem mass spectrometry. Triple quadrupole mass spectrometers are one of the commonly used instruments for performing tandem mass spectrometry. Triple quadrupole mass spectrometry consists of three quadrupole rod electrode systems, which are connected in series one after the other, as shown in figure 1. During the course of the experiment, the first set of quadrupole mass analyzers selected the parent (precursor) ions from the bulk of the ions from the ion source. The precursor ions pass from the first quadrupole mass analyser into a second quadrupole electrode system, the so-called quadrupole ion collision cell, where the accelerated precursor ions are dissociated by collisions with buffer gas molecules such as argon, helium, etc. The fragment ions obtained by dissociation enter a third quadrupole mass system from the collision cell, the third quadrupole mass system is a quadrupole mass analyzer, all the fragment ions are subjected to mass analysis by the third quadrupole mass analyzer to obtain information of the fragment ions, and then people can deduce the composition and molecular structure of parent ions according to the information of the fragment ions. This method is called tandem mass analysis. The tandem mass analysis method is more reliable for identifying parent ions than a single mass analyzer.
As shown in fig. 1, in a conventional triple quadrupole mass spectrometry system, two adjacent quadrupole electrode systems are separated by a thin plate electrode, and an ion beam enters the next quadrupole electrode system from one quadrupole electrode system and needs to pass through a small hole on the thin plate electrode. The flat electrodes are used two by two, to separate two quadrupole electrode systems and to apply a voltage thereto if necessary. However, the flat plate electrode between the two quadrupole rod electrodes also has two disadvantages, one is that the small hole on the flat plate electrode can limit the transmission of the ion beam, resulting in ion loss; secondly, the existence of the plate electrode can cause the change of the quadrupole electric field distribution generated by the power supply on the quadrupole rod, so-called 'fringe field effect' is generated, and the movement of the ions is completely dependent on the distribution of the electric field, so that the constraint of the quadrupole electric field on the ions is destroyed by the 'fringe field' distribution, the movement track of the ions after leaving the quadrupole rod electrode system is dispersed, a large amount of ions are lost, and finally the sensitivity of mass spectrometry is influenced.
That is, in almost all of the conventional commercial quadrupole mass spectrometry devices, since a high-frequency ac current is applied to the quadrupole rods and a DC current is applied to the plate electrodes, an RF signal at the ends of the quadrupole rods is coupled to a DC signal on the plate electrodes, and a fringe electric field is formed between the quadrupole rods and the plate electrodes. When the existing tandem mass spectrometer is used for ion transmission, due to the influence of an edge field effect, part of ions can deviate from an axial travelling orbit to cause loss, and the transmission efficiency of the ions is reduced.
Disclosure of Invention
In order to solve the deficiencies existing in the prior art, the utility model provides a multistage formula quadrupole rods electrode system, it can avoid marginal field effect, prevents that the ion from running off, improves ion transmission efficiency.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: a multi-segment quadrupole electrode system for improving ion transport efficiency in quadrupole mass spectrometry comprising at least two sets of adjacently disposed quadrupole electrode systems: the first quadrupole rod electrode system consists of 4 identical first electrodes, the second quadrupole rod electrode system consists of 4 identical second electrodes, and each first electrode of the first quadrupole rod electrode system and each second electrode of the adjacent and corresponding second quadrupole rod electrode system are coaxially arranged in sequence; each first electrode is provided with a first extension part at one end adjacent to the corresponding second electrode, each second electrode is provided with a second extension part with a matched shape at one end adjacent to the corresponding first electrode, the first extension part is partially overlapped with the second extension part, and a gap is arranged between the first extension part and the second extension part or is separated by an insulating material.
In some embodiments, the first extension of each of the first electrodes is stepped, and the second extension of each of the second electrodes is inverted stepped; or the first extending part of each first electrode is in a bevel shape, and the second extending part of each second electrode is in a bevel shape. The extension part structure does not need to be provided with a plate electrode with a hole, can generate continuous quadrupole electric field distribution, avoids the edge field effect caused by the existing structure, and better prevents ions from escaping to cause ion loss.
In some embodiments, the size of the gap between each first extension and its corresponding second extension ranges from 0.5 mm to 3 mm. Therefore, ion loss caused by ion escape can be prevented well, and the performance of an adjacent electrode system is not influenced.
In some embodiments, each electrode of the first quadrupole electrode system and each electrode of the second quadrupole electrode system have the same cross-section, and the cross-sectional shape is hyperbolic, circular or rectangular.
In some embodiments, the first quadrupole electrode system is selected from one of quadrupole ion guide, quadrupole mass analyser; the second quadrupole electrode system is selected from one of quadrupole ion guide, quadrupole mass analyser or quadrupole ion collision cell.
Compared with the prior art, the utility model has the advantages of: through set up specific electrode bar tip structure between adjacent two sets of electrode bars, can produce continuous quadrupole electric field distribution, avoid the marginal field effect that current structure leads to, prevent that the ion from running out and arousing ion loss to can make the ion pass through along the axial completely when two-stage or multistage mass analysis, improve the transmission efficiency of ion.
Drawings
FIG. 1 is a schematic diagram of a conventional triple quadrupole mass spectrometer;
fig. 2 is a schematic view of a partial structure of a multi-segment quadrupole electrode system according to an embodiment of the present invention;
FIG. 3 is an enlarged view of a portion a of FIG. 2;
FIG. 4 is a cross-sectional view of an extension structure of the multi-segment quadrupole electrode system in the plane A-A';
fig. 5 is a schematic partial structural view of a multi-segment quadrupole electrode system according to another embodiment of the present invention;
fig. 6 is an enlarged schematic view of a portion b of fig. 5.
Detailed Description
The multi-section quadrupole electrode system of the present invention will be described in further detail with reference to the accompanying drawings, but the present invention is not limited thereto.
Example one
As shown in the figure, the utility model discloses a multistage formula quadrupole rod electrode system for improving ion transmission efficiency in quadrupole mass spectrum, including at least two sets of adjacent quadrupole rod electrode system who places: the electrode system comprises a first quadrupole rod electrode system 1 and a second quadrupole rod electrode system 2, wherein the first quadrupole rod electrode system 1 is composed of 4 identical first electrodes 11, the second quadrupole rod electrode system 2 is composed of 4 identical second electrodes 21, and each first electrode 11 of the first quadrupole rod electrode system 1 and each second electrode 21 of the adjacent corresponding second quadrupole rod electrode system 2 are coaxially arranged in sequence.
A first extension part 12 is arranged at one end of each first electrode 11 adjacent to the corresponding second electrode 21, a second extension part 22 with a shape matched with that of the first extension part is arranged at one end of each second electrode 21 adjacent to the corresponding first electrode 11, the first extension part 12 is partially overlapped with the second extension part 22, and a gap 3 is arranged between the first extension part 12 and the second extension part 22 or is separated by an insulating material.
In this embodiment, as shown in fig. 2, the first extension portion 12 of each first electrode 11 and the second extension portion 22 of the corresponding second electrode 21 are in a step and inverted step shape, and a certain gap is left between them. The end shape of each electrode on each quadrupole electrode rod group is the same, and the electrode end shapes between adjacent quadrupole electrode rod groups are the same.
The gap size d between each first extension 12 and its corresponding second extension 22 preferably ranges from 0.5 mm to 3 mm.
Each electrode in the first quadrupole electrode system 1 and each electrode in the second quadrupole electrode system 2 have the same cross-section, and the cross-sectional shape may be hyperbolic, circular or rectangular.
The first quadrupole electrode system 1 may be selected from one of quadrupole ion guide, quadrupole mass analyser; the second quadrupole electrode system 2 may be selected from one of a quadrupole ion guide, a quadrupole mass analyser or a quadrupole ion collision cell.
Example two
A multi-section quadrupole rod electrode system for improving ion transmission efficiency in quadrupole mass spectrometry, the rest structure is the same as that of the first embodiment, and the difference is that: in this embodiment, as shown in fig. 5, each first extending portion 12 is in a bevel shape, and each second extending portion 22 is in a bevel shape. The end surface of the first extension portion 12 is parallel to the end surface of the adjacent second extension portion 22, leaving a gap d therebetween.
EXAMPLE III
A series connection method of a multi-section quadrupole rod electrode system comprises the following steps:
1) two groups of four-pole electrode systems which are adjacently placed in front and back are randomly selected from two or more groups of four-pole electrode systems to be used as a first four-pole electrode rod group and a second four-pole electrode rod group, the tail end of each electrode on the first four-pole electrode rod group is provided with a first extending part, and the front end of each electrode on the second four-pole electrode rod group is provided with a second extending part with matched shape;
2) and connecting the first quadrupole electrode rod group and the second quadrupole electrode rod group in series, partially overlapping each first extension part with the corresponding second extension part and keeping the positions symmetrical, and leaving a gap between the first extension part and the second extension part or filling an insulating material between the first extension part and the second extension part.
In the three-group and above quadrupole rod electrode system, extension structures are arranged between one or more adjacent quadrupole rod groups, and the shapes of the extension structures are the same or different. For example, in a three-group quadrupole rod electrode system, one extension structure may be provided, or two extension structures may be provided, and when two extension structures are provided, the shape structures of the extensions may be the same or different.
The utility model relates to a multistage formula quadrupole pole electrode system through set up specific electrode bar tip structure between adjacent two sets of electrode bars, can produce continuous quadrupole electric field distribution, avoids the marginal field effect that current structure leads to, prevents that the ion from running out and arousing the ion loss to can make the ion pass through along the axial completely when two-stage or multistage mass analysis, improve the transmission efficiency of ion.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and the present invention can also be modified in materials and structures, or replaced by technical equivalents. Therefore, all structural equivalents which may be made by applying the present invention to the specification and drawings, or by applying them directly or indirectly to other related technical fields, are intended to be encompassed by the present invention.
Claims (6)
1. A multi-segment quadrupole electrode system for improving ion transport efficiency in quadrupole mass spectrometry comprising at least two sets of adjacently disposed quadrupole electrode systems: the device comprises a first quadrupole rod electrode system and a second quadrupole rod electrode system, and is characterized in that the first quadrupole rod electrode system consists of 4 identical first electrodes, the second quadrupole rod electrode system consists of 4 identical second electrodes, and each first electrode of the first quadrupole rod electrode system and each second electrode of the adjacent and corresponding second quadrupole rod electrode system are coaxially arranged in sequence; each first electrode is provided with a first extension part at one end adjacent to the corresponding second electrode, each second electrode is provided with a second extension part with a matched shape at one end adjacent to the corresponding first electrode, the first extension part is partially overlapped with the second extension part, and a gap is arranged between the first extension part and the second extension part or is separated by an insulating material.
2. The multi-sectional quadrupole electrode system of claim 1, wherein the first extension of each of the first electrodes is stepped, and the second extension of each of the second electrodes is inverted stepped; or the first extending part of each first electrode is in a bevel shape, and the second extending part of each second electrode is in a bevel shape.
3. The multi-sectional quadrupole electrode system of claim 1 or 2, wherein a gap between each of the first extensions and its corresponding second extension ranges from 0.5 mm to 3 mm.
4. The multi-segment quadrupole electrode system of claim 3, wherein the first and second extensions are inclined at an angle ranging from 0 ° to 75 °.
5. The multi-sectional quadrupole electrode system of claim 1 or 2, wherein each electrode of the first quadrupole electrode system and each electrode of the second quadrupole electrode system have substantially the same cross-section, and the cross-sectional shape is hyperbolic, circular or rectangular.
6. The multi-segment quadrupole electrode system of claim 1 or 2, wherein the first quadrupole electrode system is selected from one of a quadrupole ion guide, a quadrupole mass analyzer; the second quadrupole electrode system is selected from one of quadrupole ion guide, quadrupole mass analyser or quadrupole ion collision cell.
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| CN201921395090.3U CN210668276U (en) | 2019-08-26 | 2019-08-26 | Multi-section quadrupole rod electrode system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110571128A (en) * | 2019-08-26 | 2019-12-13 | 宁波大学 | Multi-section quadrupole rod electrode system and series connection method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110571128A (en) * | 2019-08-26 | 2019-12-13 | 宁波大学 | Multi-section quadrupole rod electrode system and series connection method thereof |
| WO2021037010A1 (en) * | 2019-08-26 | 2021-03-04 | Ningbo University | Connection between multistage quadrupole electrode system and its method |
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