CN112201558A - An ion mobility spectrometer migration region with enhanced ion focusing effect - Google Patents
An ion mobility spectrometer migration region with enhanced ion focusing effect Download PDFInfo
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- CN112201558A CN112201558A CN202011173676.2A CN202011173676A CN112201558A CN 112201558 A CN112201558 A CN 112201558A CN 202011173676 A CN202011173676 A CN 202011173676A CN 112201558 A CN112201558 A CN 112201558A
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- 230000005012 migration Effects 0.000 title claims abstract description 55
- 238000013508 migration Methods 0.000 title claims abstract description 55
- 230000000694 effects Effects 0.000 title claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 14
- 230000005684 electric field Effects 0.000 abstract description 3
- 150000002500 ions Chemical class 0.000 description 23
- 230000007704 transition Effects 0.000 description 10
- 239000007789 gas Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000012159 carrier gas Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
- G01N27/622—Ion mobility spectrometry
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/06—Electron- or ion-optical arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/26—Mass spectrometers or separator tubes
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- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Health & Medical Sciences (AREA)
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
The invention provides a migration region of an ion mobility spectrometer with enhanced ion focusing effect, which comprises: the inner electrode of the migration area is a metal cylinder and is connected with a radio frequency power supply; the outer electrode of the migration area is a metal hollow cylindrical column, is connected with a ground electrode and is sleeved outside the inner electrode of the migration area, and a comb-shaped structure with gaps disconnected at intervals is arranged in the middle of the cylindrical column along the axial direction; the insulating gasket is of an annular structure with the shape consistent with the shape of the broken gap of the comb-shaped structure and is arranged in the comb-shaped structure, so that the shape of the cylinder wall of the outer electrode in the migration area is kept complete. According to the invention, the outer electrode of the migration area is designed into the comb-shaped electrode, so that compared with the traditional cylindrical migration area, the non-uniformity degree of the electric field in the gas flow channel is further increased, and the migration area has a more obvious ion focusing effect. An insulating gasket is additionally arranged between the two metal electrode plates of the comb-shaped electrode, so that the surface area of the metal electrode is reduced, and further, the ion loss is reduced, and better signal quality can be obtained.
Description
Technical Field
The invention relates to the field of ion migration, in particular to a migration region of an ion mobility spectrometer, which adopts a cylindrical migration region with a grid electrode structure to enhance an ion focusing effect.
Background
The migration region in the high-field asymmetric waveform ion migration region is mostly in a flat plate type structure or a cylindrical structure. Among them, the cylindrical transition region is widely used because of its ion focusing characteristic.
However, although the cylindrical migration region has the characteristic of ion focusing, compared with the flat plate type migration region, the cylindrical migration region with a large gap has a weaker ion signal, because the gas flow channel gap and the volume of the cylindrical migration region are large, the volume flow rate of the gas is smaller than that of the gas in the flat plate type migration region, and thus, in the process that the ions move forward along with the carrier gas and continuously diffuse, more ions can impact the surface of the electrode and then be neutralized, so that the ion loss of the cylindrical migration region with the large gap is serious under the condition of providing the same gas flow rate.
Disclosure of Invention
The invention aims to provide a migration region of an ion mobility spectrometer, which adopts a cylindrical migration region of a grid electrode structure to enhance the ion focusing effect.
Specifically, the invention provides an ion mobility spectrometer migration region with an enhanced ion focusing effect, comprising:
the inner electrode of the migration area is a metal cylinder and is connected with a radio frequency power supply;
the outer electrode of the migration area is a metal hollow cylindrical column, is connected with a ground electrode and is sleeved outside the inner electrode of the migration area, and a comb-shaped structure with gaps disconnected at intervals is arranged in the middle of the cylindrical column along the axial direction;
the insulating gasket is of an annular structure with the shape consistent with the shape of the broken gap of the comb-shaped structure and is arranged in the comb-shaped structure, so that the shape of the cylinder wall of the outer electrode in the migration area is kept complete.
In one embodiment of the present invention, the diameter of the electrode in the transition region is greater than 0CM and less than 2 CM.
In one embodiment of the invention, the inner hollow diameter of the outer electrode in the migration zone is less than 5 CM.
In one embodiment of the present invention, the number of comb structures in the outer electrode in the transition region is at least one.
In one embodiment of the present invention, the spacing between two of the comb structures is greater than 0CM and less than 1 CM.
In one embodiment of the invention, the width of the comb structure is greater than 0CM and less than 1 CM.
In one embodiment of the present invention, the height of the outer electrode in the transition region is greater than 0CM and less than 10CM, and the height of the inner electrode in the transition region is less than or equal to the height of the outer electrode in the transition region.
According to the invention, the outer electrode of the migration area is designed into the comb-shaped electrode, so that compared with the traditional cylindrical migration area, the non-uniformity degree of the electric field in the gas flow channel is further increased, and the migration area has a more obvious ion focusing effect. An insulating gasket is additionally arranged between the two metal electrode plates of the comb-shaped electrode, so that the surface area of the metal electrode is reduced, and further, the ion loss is reduced, and better signal quality can be obtained.
Drawings
Fig. 1 is a schematic diagram of the structure of the mobility region of an ion mobility spectrometer according to an embodiment of the present invention.
Detailed Description
The detailed structure and implementation process of the present solution are described in detail below with reference to specific embodiments and the accompanying drawings.
In one embodiment of the present invention, as shown in fig. 1, an ion mobility spectrometer mobility region with enhanced ion focusing effect is disclosed, comprising:
the inner electrode 1 of the migration area is a metal cylinder and is connected with a radio frequency power supply 4; the diameter of the electrode 1 in the transition region is larger than 0CM and smaller than 2 CM.
The outer electrode 2 in the migration area is a metal hollow cylindrical column, and the diameter of the inner hollow column is less than 5 CM; the grounding electrode 5 is connected and sleeved outside the electrode 1 in the migration area, and an interval disconnection structure is arranged in the middle of the cylindrical column body along the axial direction; the spaced-apart structure is a gap formed by completely cutting out an annular side wall from the cylinder of the motor 2 outside the migration zone along the radial direction according to a certain width, and a plurality of gaps form a comb-shaped structure with equal intervals.
The number of comb structures in the outer electrode 2 in the migration zone is generally greater than or equal to one. The spacing between the two comb structures is greater than 0CM and less than 1CM (corresponding to the thickness of the insulating sign described below), and the width of the comb structures is generally greater than 0CM and less than 1 CM.
The insulating gasket 3 is an annular structure with the shape consistent with the gap on the motor 2 outside the migration zone, and is arranged in the comb-shaped structure of the electrode 2 outside the migration zone, so that the shape of the cylinder wall of the electrode 2 outside the migration zone is kept complete. The insulating gasket 3 is fixed by glue after being filled, and the inner diameter and the outer diameter of the insulating gasket 3 are respectively consistent with the inner diameter and the outer diameter of the cylindrical column of the outer electrode 2 in the migration zone, so that the surface of the gas flow passage is smooth, and the gas tightness of the whole migration zone is ensured.
In the present embodiment, the height of the outer electrode 2 in the transition region is greater than 0CM and less than 10CM, and the height of the inner electrode 1 in the transition region is less than or equal to the height of the outer electrode 2 in the transition region.
In the embodiment, the outer electrode of the migration area is designed into the comb-shaped electrode, so that compared with the traditional cylindrical migration area, the non-uniform degree of the electric field in the gas flow channel is further increased, and the migration area has a more obvious ion focusing effect. An insulating gasket is additionally arranged between the two metal electrode plates of the comb-shaped electrode, so that the surface area of the metal electrode is reduced, and further, the ion loss is reduced, and better signal quality can be obtained.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (7)
1. An ion mobility spectrometer mobility region with enhanced ion focusing effects, comprising:
the inner electrode of the migration area is a metal cylinder and is connected with a radio frequency power supply;
the outer electrode of the migration area is a metal hollow cylindrical column, is connected with a ground electrode and is sleeved outside the inner electrode of the migration area, and a comb-shaped structure with gaps disconnected at intervals is arranged in the middle of the cylindrical column along the axial direction;
the insulating gasket is of an annular structure with the shape consistent with the shape of the broken gap of the comb-shaped structure and is arranged in the comb-shaped structure, so that the shape of the cylinder wall of the outer electrode in the migration area is kept complete.
2. The ion mobility spectrometer mobility region of claim 1,
the diameter of the electrode in the migration region is larger than 0CM and smaller than 2 CM.
3. The ion mobility spectrometer mobility region of claim 1,
the inner hollow diameter of the outer electrode in the migration zone is less than 5 CM.
4. The ion mobility spectrometer mobility region of claim 1,
the number of the comb-shaped structures in the outer electrode of the migration area is at least one.
5. The ion mobility spectrometer mobility region of claim 4,
the spacing between two of the comb structures is greater than 0CM and less than 1 CM.
6. The ion mobility spectrometer mobility region of claim 1,
the width of the comb structure is greater than 0CM and less than 1 CM.
7. The ion mobility spectrometer mobility region of claim 1,
the height of the outer electrode in the migration area is larger than 0CM and smaller than 10CM, and the height of the inner electrode in the migration area is smaller than or equal to the height of the outer electrode in the migration area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011173676.2A CN112201558A (en) | 2020-10-28 | 2020-10-28 | An ion mobility spectrometer migration region with enhanced ion focusing effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011173676.2A CN112201558A (en) | 2020-10-28 | 2020-10-28 | An ion mobility spectrometer migration region with enhanced ion focusing effect |
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| Publication Number | Publication Date |
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| CN112201558A true CN112201558A (en) | 2021-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011173676.2A Withdrawn CN112201558A (en) | 2020-10-28 | 2020-10-28 | An ion mobility spectrometer migration region with enhanced ion focusing effect |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005004986A (en) * | 2003-06-09 | 2005-01-06 | Hamamatsu Photonics Kk | Ion mobility detector |
| US20050151072A1 (en) * | 2002-02-08 | 2005-07-14 | Ionalytics Corporation | Segmented side-to-side faims |
| US20070278398A1 (en) * | 2006-05-30 | 2007-12-06 | Gangqiang Li | Ion mobility spectrometry waveform |
| CN102568995A (en) * | 2010-12-16 | 2012-07-11 | 塞莫费雪科学（不来梅）有限公司 | Ion mobility spectrometry device and method |
| US20130180893A1 (en) * | 2010-09-20 | 2013-07-18 | Anastassios Giannakopulos | Faims apparatus and method comprising an ion separation channel of helical shape |
| CN108538700A (en) * | 2018-05-15 | 2018-09-14 | 中国科学技术大学 | A kind of Proton-Transfer Reactions ion source, mass spectrograph and its detection method |
| CN213459636U (en) * | 2020-10-28 | 2021-06-15 | 深圳市斯贝达电子有限公司 | Ion mobility spectrometer migration area with enhanced ion focusing effect |
-
2020
- 2020-10-28 CN CN202011173676.2A patent/CN112201558A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050151072A1 (en) * | 2002-02-08 | 2005-07-14 | Ionalytics Corporation | Segmented side-to-side faims |
| JP2005004986A (en) * | 2003-06-09 | 2005-01-06 | Hamamatsu Photonics Kk | Ion mobility detector |
| US20070278398A1 (en) * | 2006-05-30 | 2007-12-06 | Gangqiang Li | Ion mobility spectrometry waveform |
| US20130180893A1 (en) * | 2010-09-20 | 2013-07-18 | Anastassios Giannakopulos | Faims apparatus and method comprising an ion separation channel of helical shape |
| CN102568995A (en) * | 2010-12-16 | 2012-07-11 | 塞莫费雪科学（不来梅）有限公司 | Ion mobility spectrometry device and method |
| CN108538700A (en) * | 2018-05-15 | 2018-09-14 | 中国科学技术大学 | A kind of Proton-Transfer Reactions ion source, mass spectrograph and its detection method |
| CN213459636U (en) * | 2020-10-28 | 2021-06-15 | 深圳市斯贝达电子有限公司 | Ion mobility spectrometer migration area with enhanced ion focusing effect |
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Application publication date: 20210108 |