CN108133877A - It is a kind of that there is the highly sensitive ionic migration spectrometer of ion binding and method - Google Patents
It is a kind of that there is the highly sensitive ionic migration spectrometer of ion binding and method Download PDFInfo
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- CN108133877A CN108133877A CN201711312704.2A CN201711312704A CN108133877A CN 108133877 A CN108133877 A CN 108133877A CN 201711312704 A CN201711312704 A CN 201711312704A CN 108133877 A CN108133877 A CN 108133877A
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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
- H01J49/061—Ion deflecting means, e.g. ion gates
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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
- H01J49/26—Mass spectrometers or separator tubes
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Abstract
There is the highly sensitive ionic migration spectrometer of ion binding and method the invention discloses a kind of, using two layers of parallel metal grid mesh as ion gate, by regulating and controlling the voltage of aperture plate, realize the open and close of ion gate.The ion generated when ion gate is closed can be bound and be stored between two panels aperture plate, and when ion gate is opened, the ion of storage is pushed into migration area, is then detected by charge detector.In ion mobility spectrometry, in a cycle, ion gate lockup is 50 100 times of ion gate opening time, that is the number of the ion that the ion gate shut-in time generates is 50 100 times of the ion populations that ion gate opening time generates, the ion that the present invention generates the ion gate shut-in time is fettered, stored and is detected, signal strength can promote 12 magnitudes, can significantly improve the sensitivity of ion mobility spectrometry, promote the performance of ion mobility spectrometry.
Description
Technical field
The invention belongs to analytical instrument and detection field, and in particular to a kind of to have the function of the highly sensitive ion of ion binding
Mobility spectrometer and method.The ionic migration spectrometer employs special ion gate design, can realize ion binding and storage, show
The sensitivity of the raising mobility spectrometer of work.
Background technology
Ion gate is one of core devices of ionic migration spectrometer.Closing and opening by ion gate, reaction zone from
Son can enter migration area with the period, be detected by the detector by separation.
In conventional ionic migration spectrometer, in a complete cycle, ion gate lockup is typically the 50- of opening time
100 times, i.e., lockup is far longer than the time of enabling, but when detecting ion, ionic migration spectrometer can only detect open
The door time interior ion populations by ion gate, and a large amount of ions that lockup generates, then it is ignored, cause the wave of ion
Take.
For traditional linear type ion mobility spectrometry, still no technology can realize the ion that will be generated during shutdown at present
It fetters and stores, the detection for next cycle is prepared.The present invention by the parallel aperture plate of two panels, realize ion constraint and
Storage can significantly improve the sensitivity of ionic migration spectrometer.
Invention content
The technical problem to be solved in the present invention is：When overcoming the existing ionic migration spectrometer intermediate ion door to open the door, by from
Subnumber mesh is few, the low difficulty of detectivity, provide it is a kind of have the function of the highly sensitive ionic migration spectrometer of ion binding and
Method can realize ion binding and storage during ion gate is closed the door using the novel ion door with ion binding ability
It deposits, improves the sensitivity of ion mobility spectrometry.In addition, the voltage by adjusting ion gate, the resolution of ion mobility spectrometry can be improved
Rate.
The present invention solve the technical solution that uses of above-mentioned technical problem for：It is a kind of have the function of ion binding it is highly sensitive from
Sub- mobility spectrometer, including reaction zone, the first aperture plate, constraint area, the second aperture plate, migration area and charge detector, the first aperture plate, beam
Tie up the ion gate with ion binding ability of area and the second aperture plate composition.
Wherein, ionic migration spectrometer is divided into ionized region, constraint area and migration area by the first aperture plate and the second aperture plate.
Wherein, the first aperture plate and the second aperture plate are the two panels aperture plates being mutually parallel, and the distance between two panels aperture plate is 5 millis
Rice is to 1 centimetre.
Wherein, pulse voltage is applied to the first aperture plate, and second gate applies constant potential on the net.
Wherein, the ion gate down periods keep uniform electric field between the first aperture plate and reaction zone；The absolute electricity of first aperture plate
Gesture absolute value is slightly larger than or the absolute potential equal to the second aperture plate, fetters the ranging from 0-10V/cm of area's electric field strength, electric herein
Under field intensity, the shut-in time will not cause ion to realize ion binding in storage function by the second aperture plate；Second aperture plate is with moving
Shifting equally keeps uniform electric field between area.
Wherein, during ion gate is opened, the potential absolute value of the first aperture plate is more than the absolute of reaction zone last block pole plate
Potential forms reversed electric field, blocks passing through for ion；The absolute potential of the first aperture plate is absolute also greater than the second aperture plate at this time
Potential forms a positive migration electric field in area is fettered, fetters the ion stored in area, will be moved under electric field action by injection
Move area；Uniform electric field is equally kept between second aperture plate and migration area.
Wherein, it realizes and the ion of ion gate down periods is fettered, stored and detected, with traditional ion mobility spectrometry
It compares, detectable ion populations can improve 1 to 2 magnitude, can significantly improve the sensitivity of ion mobility spectrometry.
The realization process of the method for the present invention is as follows：The opening of ion gate is realized by applying pulse voltage on the net to the first grid
With closing, and the second aperture plate only need apply DC voltage.When ion gate is closed, the first aperture plate keeps equal even just with reaction zone
To electric field, ensure that ion can pass through the first aperture plate under electric field action and enter constraint area.The first aperture plate is absolute at this time
Potential is slightly larger than or the absolute potential equal to the second aperture plate, ranging from the 0 of light current field intensity between the first aperture plate and the second aperture plate
To 10V/cm, there are a positive weak electric fields to be enriched at the first aperture plate to avoid ion, influences subsequent ion and enters constraint
Area, simultaneously because electric field is very weak, the time that ion gate is closed cannot cause the ion for entering constraint area to pass through the region, and ion is complete
Portion is bound and is stored in constraint area；When ion gate is opened, the absolute potential of the first aperture plate is more than last block pole of reaction zone
The absolute potential of plate, that is, formed a reversed electric field, block subsequent ion by the first aperture plate, the first aperture plate is absolute at this time
Potential is also greater than the absolute potential of the second aperture plate, and (electric field strength is 260V/cm to 600V/ to the high intensity positive field of formation
Cm), it is ensured that in opening time, the ion fettered in area can fully enter migration area, then be detected by charge detector
It arrives, realizes the function that ion mobility spectrometry is periodically detected ion.
The advantages of the present invention over the prior art are that：Present invention employs the novel ions with ion binding ability
Door, the ion binding that is generated when can ion gate be closed and is stored in ion gate, compared to the ionic migration spectrum detection period
Middle shutdown and the ratio 50 of opening time:1 to 100:1, i.e. the number of the ion that the ion gate shut-in time generates is that ion gate is opened
50-100 times of the ion populations that the door time generates, the ion that the present invention generates the ion gate shut-in time are fettered, are stored
And detection, the sensitivity of ion mobility spectrometry can be improved 1-2 magnitude, improve the performance of ion mobility spectrometry.Using it is novel from
Cervical orifice of uterus can greatly improve the sensitivity (being suitble to low concentration sample detection) of ion mobility spectrometry.
Description of the drawings
Fig. 1 is that a kind of of the present invention has the function of the highly sensitive ionic migration spectrometer schematic diagram of ion binding, 1- reaction zones,
The first aperture plates of 2-, 3- constraints area, the second aperture plates of 4-, 5- migration areas, 6- charge detectors；
Fig. 2 be the novel ion door with ion binding ability of the present invention at closing time, electric field distribution and electric in migration spectrum
Gesture trend graph；
When Fig. 3 is that the novel ion door with ion binding ability of the present invention opens the door, electric field distribution and electricity in migration spectrum
Gesture trend graph.
Specific embodiment
Below in conjunction with attached drawing, the concrete mode of the present invention is illustrated.
As shown in Figure 1, a kind of have the function of the highly sensitive ionic migration spectrometer of ion binding, including reaction zone 1, first
Aperture plate 2, constraint area 3, the second aperture plate 4, migration area 5, charge detector 6.Wherein the first aperture plate 2, constraint 3 and second aperture plate 4 of area
Collectively form the novel ion door with ion binding ability.The ionic migration spectrometer, detection cycle are 20 milliseconds to 30 millis
Second, the time that wherein ion gate is opened is about 150 microseconds to 500 microseconds.In addition to ion gate region, mobility spectrometer is using uniform
Electric field is migrated, migration electric field strength is 260V/cm to 600V/cm.The novel ion door, structure by be mutually parallel first
2 and second aperture plate 4 of aperture plate is formed, and the distance between aperture plate is 5 millimeters to 1 centimetre.The novel ion door, voltage apply feelings
Condition is that the voltage of the first aperture plate 2 is pulse voltage, and the second aperture plate 4 is DC voltage.The operation principle of novel ion door is to pass through
The voltage of the first aperture plate 2 is adjusted to control the opening and closing of ion gate.When ion gate is closed, the absolute electricity of the first aperture plate 2
Gesture is less than the absolute potential of last block pole plate of reaction zone, and ion can pass through the first aperture plate 2 and enter constraint area 3, simultaneously
The absolute potential of first aperture plate 2 is equal or slightly larger than the second aperture plate 4, and ion is avoided to be enriched at the first aperture plate 2, influence subsequently from
Son enters constraint area 3, and in the time that also guarantee ion is closed in ion gate, ion will not enter migration area by the second aperture plate 4,
The electric field of migration spectrum and potential are as shown in Figure 2 when ion gate is closed；When ion gate is opened, the absolute potential meeting of the first aperture plate 2
More than the absolute potential of last block pole plate of reaction zone, ion is blocked, it is impossible to by the first aperture plate 2, the at the same time first grid
The absolute potential of net 2 is more than the absolute potential of the second aperture plate 4, when high intensity positive field can close last periodic ion door
The ion for being bound and storing all is pushed into migration area 5, is then detected by charge detector 6, thereby realizes ion and move
Move the function of spectrum.
This novel ion door with ion binding is innovation of the invention, when can ion gate be closed
It the ion binding of generation and is stored in ion gate.Traditional ion mobility spectrometry is by ion gate when detection ion gate is opened
Ion, and the ion generated during ion gate closing is rejected, but lockup is typically out in legacy migration spectrum detection cycle
50-100 times of door time, so the ion binding generated when ion gate is closed, storage and detection, can improve detection effect
Rate.
It is proposed by the present invention that there is the ion gate of ion binding, by adjusting the first aperture plate 2 close to reaction zone
Potential, when ion gate is closed, between ion enters two panels aperture plate under the action of electric field, a positive light current between aperture plate
, ion is avoided to be enriched at the first aperture plate 2, subsequent ion is influenced and enters constraint area 3, while also ensure to close the door the period at one
Interior, ion does not pass through the second aperture plate 4 into migration area.When ion gate is opened, produced between the first aperture plate 2 and the second aperture plate 4
The ion fettered in area 3 is all pushed into migration area, is then detected by a raw highfield.The ion that the present invention finally detects
For the ion fettered in the ion gate shut-in time, compared with general migration spectrum detection, the ion populations that can be detected can carry
High 1-2 magnitude can significantly improve the sensitivity of ion mobility spectrometry.
In short, it is proposed by the present invention it is a kind of there is the highly sensitive ionic migration spectrometer of ion binding and method, can be with
Improve the sensitivity of ionic migration spectrometer so that the performance of ionic migration spectrometer has great promotion.
Description of the invention does not elaborate and partly belongs to techniques well known.
Claims (8)
1. a kind of have the function of the highly sensitive ionic migration spectrometer of ion binding, including reaction zone (1), the first aperture plate (2), constraint
Area (3), the second aperture plate (4), migration area (5) and charge detector (6), it is characterised in that：First aperture plate (2), constraint area (3) and
The ion gate with ion binding ability of second aperture plate (4) composition.
2. according to claim 1 have the function of the highly sensitive ionic migration spectrometer of ion binding, it is characterised in that：First
Ionic migration spectrometer is divided into ionized region (1), constraint area (3) and migration area (5) by aperture plate (2) and the second aperture plate (4).
3. according to claim 1 have the function of the highly sensitive ionic migration spectrometer of ion binding, it is characterised in that：First
Aperture plate (2) and the second aperture plate (4) are the two panels aperture plates being mutually parallel, and the distance between two panels aperture plate is 5 millimeters to 1 centimetre.
4. according to claim 3 have the function of the highly sensitive ionic migration spectrometer of ion binding, it is characterised in that：Pulse
Voltage is applied to the first aperture plate (2), and the second aperture plate applies constant potential on (4).
5. according to claim 1 have the function of the highly sensitive ionic migration spectrometer of ion binding, it is characterised in that：Ion
The door down periods, uniform electric field is kept between the first aperture plate (2) and reaction zone (1)；The absolute potential absolute value of first aperture plate (2)
It is slightly larger than or the absolute potential equal to the second aperture plate (4), the ranging from 0-10V/cm of area (3) electric field strength is fettered, in this electric field
Under intensity, the shut-in time will not cause ion to realize ion binding in storage function by the second aperture plate (4)；Second aperture plate (4)
Uniform electric field is equally kept between migration area (5).
6. according to claim 1 have the function of the highly sensitive ionic migration spectrometer of ion binding, it is characterised in that：Ion
During door is opened, the potential absolute value of the first aperture plate (2) is more than the absolute potential of reaction zone (1) last block pole plate, is formed anti-
To electric field, passing through for ion is blocked；At this time the absolute potential of the first aperture plate (2) also greater than the second aperture plate (4) absolute potential,
A positive migration electric field is formed in constraint area (3), the ion stored in constraint area (3) will be injected under electric field action
Migration area；Uniform electric field is equally kept between second aperture plate (4) and migration area (5).
7. according to claim 1 have the function of the highly sensitive ionic migration spectrometer of ion binding, it is characterised in that：It realizes
The ion of ion gate down periods is fettered, stored and detected, compared with traditional ion mobility spectrometry, can detect number of ions
Mesh can improve 1 to 2 magnitude, can significantly improve the sensitivity of ion mobility spectrometry.
8. a kind of have the function of the highly sensitive Ion transfer method of ion binding, the tool of any one of the claims 1-7 is utilized
There is the highly sensitive ionic migration spectrometer of ion binding function, it is characterised in that：By to applying pulse voltage on the first aperture plate (2)
Realize opening and the closing of ion gate, and the second aperture plate (4) only needs to apply DC voltage；When ion gate is closed, the first grid
Net (2) keeps uniform positive field with reaction zone (1), ensures that ion can pass through the first aperture plate (2) under electric field action
Into constraint area (3), the absolute potential of the first aperture plate (2) is slightly larger than or the absolute potential equal to the second aperture plate (4) at this time, and first
Ranging from the 0 to 10V/cm of light current field intensity between aperture plate (2) and the second aperture plate (4), there are a positive weak electric fields to keep away
Exempt from ion to be enriched at the first aperture plate (2), influence subsequent ion and enter constraint area (3), simultaneously because electric field is very weak, ion gate closes
The time closed cannot cause the ion for entering constraint area (3) to pass through the region, and ion is all bound and is stored in constraint area
(3)；When ion gate is opened, the absolute potential of the first aperture plate (2) is more than the absolute potential of reaction zone (1) last block pole plate,
I.e. formed a reversed electric field, block subsequent ion by the first aperture plate (2), the absolute potential of the first aperture plate (2) is same at this time
Sample is more than the absolute potential of the second aperture plate (4), and the high intensity positive field of formation can ensure in opening time, fetters area (3)
In ion can fully enter migration area, then detected by charge detector (6), realize ion mobility spectrometry periodically examine
The function of measured ion.
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| CN201711312704.2A CN108133877B (en) | 2017-12-12 | 2017-12-12 | High-sensitivity ion mobility spectrometer with ion binding function and method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110310882A (en) * | 2019-07-03 | 2019-10-08 | 清华大学深圳研究生院 | The ion door control method of BN discrimination effects in a kind of improvement ion mobility spectrometry |
| CN110487885A (en) * | 2018-11-25 | 2019-11-22 | 中国科学院大连化学物理研究所 | A kind of device and method of high pass measurement Ammonia in Atmosphere |
| CN110534395A (en) * | 2019-08-27 | 2019-12-03 | 清华大学深圳研究生院 | A kind of ion door control method for ionic migration spectrometer |
| CN111199867A (en) * | 2018-11-20 | 2020-05-26 | 中国科学院大连化学物理研究所 | Low discrimination ion gate and control method |
| CN111257400A (en) * | 2018-11-30 | 2020-06-09 | 中国科学院大连化学物理研究所 | Method for improving detection sensitivity of ion mobility spectrometer |
| CN112820620A (en) * | 2020-12-29 | 2021-05-18 | 中船重工安谱（湖北）仪器有限公司 | Symmetric ion gate control method for ion mobility tube |
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| CN111199867A (en) * | 2018-11-20 | 2020-05-26 | 中国科学院大连化学物理研究所 | Low discrimination ion gate and control method |
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| CN110534395A (en) * | 2019-08-27 | 2019-12-03 | 清华大学深圳研究生院 | A kind of ion door control method for ionic migration spectrometer |
| CN110534395B (en) * | 2019-08-27 | 2022-03-11 | 清华大学深圳研究生院 | Ion gate control method for ion mobility spectrometer |
| CN112820620A (en) * | 2020-12-29 | 2021-05-18 | 中船重工安谱（湖北）仪器有限公司 | Symmetric ion gate control method for ion mobility tube |
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