CN103779169A - Surface discharge ionization source ion gate-free transference tube - Google Patents
Surface discharge ionization source ion gate-free transference tube Download PDFInfo
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- CN103779169A CN103779169A CN201210395973.0A CN201210395973A CN103779169A CN 103779169 A CN103779169 A CN 103779169A CN 201210395973 A CN201210395973 A CN 201210395973A CN 103779169 A CN103779169 A CN 103779169A
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Abstract
The invention discloses a surface discharge ionization source ion gate-free transference tube. The surface discharge ionization source ion gate-free transference tube is characterized in that surface discharge ionization is utilized for generating thin ion slices to replace a conventional ion gate, and a pulse electric field is utilized for introducing ions into a drift region. The instrument assembling is simple, and batch production and miniaturization are facilitated. The surface discharge ionization source ion gate-free transference tube is composed of a pulse repulsion electrode, a surface discharge ion source, the drift region, an ion receiving pole and the like which are axially distributed; and an object to be tested is ionized by the ion source, and generated product ions are respectively introduced to the drift region by the pulse repulsion electrode, fly in an electric field provided by a high voltage power supply, and are finally received and detected by the iron receiving pole.
Description
Technical field
The present invention is a kind of surface discharge ionization source-without ion gate transference tube, it is characterized in that utilizing surface discharge ionization to produce thin ion sheet and substitute conventional ion door, make instrument assembling simpler, be easy to mass and microminiaturization, formed by the pulse repulsion electrode distributing along axis, surface discharge ion source, drift region, aperture plate, ion receiving pole etc.The product ion that determinand is produced by ion source ionization is introduced drift region by pulse repulsion electrode respectively, in the electric field providing, flies in high voltage source, is finally received and detects by ion receiving pole.This invention belongs to instrument analysis technology.
Background technology
Atmospheric Chemistry analytical method is always by the research topic of mankind institute extensive concern.The mankind put into research by a large amount of manpower and materials and have highly sensitive, the simple analytical instrument of equipment, detect drugs, excitant, anesthetic and explosive.In military affairs, the every field such as public safety have a large amount of demands for good detecting instrument at present.The present invention proposes on this Demand Base.
Ion mobility spectrometry utilizes the under atmospheric pressure flight time difference in uniform field of different ions, realizes the separation and analysis of different material.Critical component intermediate ion door at ion mobility spectrometry is one of parts of most critical, and its effect is that pulsed is injected migration area one ion sheet.Common ion gate mainly contains two large classes at present.One class is used the parallel wire of two groups of mutual insulatings and alternative arrangement, and makes it in same plane.This type of ion gate is called as Bradbury-Nielsen door, and its invention should be given the credit to Cravath and Van de Cnaaff, and two of them independently proposed separately in nineteen twenty-nine in bibliographical information.The another kind of Tyndall door that is called as, seemingly, but there are two kinds of sayings in function and BN class in its structure.But ion gate manufacture method complexity, and the existence of ion gate can cause ion collision to ion gate, causes the loss of ion, desensitization.
If can find the parts that substitute conventional ion gate action, the sensitivity that can further improve ion mobility spectrometry.The present invention is by utilizing surface discharge to produce ion sheet at the electrode surface of vertical and axis direction, and compartment analysis is realized in the migration area that then utilizes impulse electric field that ion is introduced to transference tube.
Summary of the invention
The object of this invention is to provide a kind of surface discharge ionization source-without ion gate transference tube, have simple in structure, be easy to the features such as assembling and mass production.
For reaching this object, the technical solution used in the present invention is:
Surface discharge ionization source is made up of the high-field electrode and the ground electrode that are embedded in insulation PTFE.Migration tube adopts traditional design, and changes ion gate and ionization source section into surface discharge ionization source assembly.This surface discharge ionization source assembly can be realized the function of injecting of ion gate.
Be specially:
A kind of surface discharge ionization source-without ion gate transference tube, comprise the drift region, aperture plate, the ion receiving pole that distribute along axis, is provided with surface discharge ion source in a side of the drift region away from ion receiving pole; Surface discharge ion source comprises pulse repulsion electrode, surface discharge high-field electrode and ground electrode, dielectric base, pulse repulsion electrode is placed perpendicular to the axis of transference tube, on surface in pulse repulsion electrode near drift region one side, be provided with tabular dielectric base, surface discharge high-field electrode and ground electrode are embedded in dielectric base, the discharge end of surface discharge high-field electrode and ground electrode is towards away from pulse repulsion electrode one side, and their discharge end is in pulse repulsion electrode) on projection space; Form surface discharge district in dielectric base away from pulse repulsion electrode one side surface.
Surface discharge high-field electrode and ground electrode are embedded in dielectric base inside, and the spacing of the two is greater than electric discharge high-field electrode and ground electrode arrives the distance near one side dielectric base surface, drift region.
On surface discharge high-field electrode, apply an alternating voltage, voltage is at 200V to 30kV, and frequency arrives 80kHz at 30Hz.
Drift region is to be made up of coaxial electrode retaining collar group, the electrical connection of electrode retaining collar group control electrode, the formation drift region, space in electrode retaining collar group; Be provided with repulsion electrode retaining collar in electrode retaining collar group left end near surface discharge ion source, repel electrode retaining collar coaxial with electrode retaining collar group.
The repulsion voltage applying on pulse repulsion electrode when sample detection will higher than repel electrode retaining collar electromotive force, repel electrode retaining collar electromotive force higher than the electromotive force of electrode retaining collar group, pulsewidth is at 1us between 50ms, the cycle is greater than 10ms; When accident sample, no-voltage on pulse repulsion electrode repels the voltage of electrode retaining collar lower than the voltage of electrode retaining collar group simultaneously, prevents that ion from entering drift region and producing ionic background interference signal.
The present invention is a kind of surface discharge ionization source-without ion gate transference tube, utilizes surface discharge ionization to produce thin ion sheet and substitutes conventional ion door, utilizes impulse electric field that ion is introduced to drift region, and instrument assembling simply, is easy to mass and microminiaturization.Formed by the pulse repulsion electrode distributing along axis, surface discharge ion source, drift region, aperture plate, ion receiving pole etc.; The product ion that determinand is produced by ion source ionization is introduced drift region by pulse repulsion electrode respectively, in the electric field providing, flies in high voltage source, is finally received and detects by ion receiving pole.
Accompanying drawing explanation
Fig. 1 is a kind of surface discharge ionization source-without ion gate transference tube.
Embodiment
Embodiment:
A kind of surface discharge ionization source-without ion gate transference tube, comprise the drift region, aperture plate, the ion receiving pole that distribute along axis, is provided with surface discharge ion source in a side of the drift region away from ion receiving pole; Surface discharge ion source comprises pulse repulsion electrode, surface discharge high-field electrode and ground electrode, dielectric base, pulse repulsion electrode is placed perpendicular to the axis of transference tube, on surface in pulse repulsion electrode near drift region one side, be provided with tabular dielectric base, surface discharge high-field electrode and ground electrode are embedded in dielectric base, the discharge end of surface discharge high-field electrode and ground electrode is towards away from pulse repulsion electrode one side, and their discharge end is in pulse repulsion electrode) on projection space; Form surface discharge district in dielectric base away from pulse repulsion electrode one side surface.
Surface discharge high-field electrode and ground electrode are embedded in dielectric base inside, and the spacing of the two is greater than electric discharge high-field electrode and ground electrode arrives the distance near one side dielectric base surface, drift region.
On surface discharge high-field electrode, apply an alternating voltage, voltage is at 200V to 30kV, and frequency arrives 80kHz at 30Hz.
Drift region is to be made up of coaxial electrode retaining collar group, the electrical connection of electrode retaining collar group control electrode, the formation drift region, space in electrode retaining collar group; Be provided with repulsion electrode retaining collar in electrode retaining collar group left end near surface discharge ion source, repel electrode retaining collar coaxial with electrode retaining collar group.
The repulsion voltage applying on pulse repulsion electrode when sample detection will higher than repel electrode retaining collar electromotive force, repel electrode retaining collar electromotive force higher than the electromotive force of electrode retaining collar group, pulsewidth is at 1us between 50ms, the cycle is greater than 10ms; When accident sample, no-voltage on pulse repulsion electrode repels the voltage of electrode retaining collar lower than the voltage of electrode retaining collar group simultaneously, prevents that ion from entering drift region and producing ionic background interference signal.As shown in Figure 1, a kind of surface discharge ionization source assembly, comprises the surface discharge high-field electrode 1 and the ground electrode 2 that are embedded in insulation PTFE.On surface discharge high-field electrode 1, apply an ac high-voltage, at surface discharge district 3 interior generation ion sheet.Periodically on pulse repulsion electrode 4, apply pulse, just ion can be introduced to drift region 12 and separate, finally detected by farad domain 9.
Claims (5)
1. a surface discharge ionization source-without ion gate transference tube, comprise the drift region (12), aperture plate (8), the ion receiving pole (9) that distribute along axis, it is characterized in that: the side in the drift region away from ion receiving pole (9) (12) is provided with surface discharge ion source;
Surface discharge ionization source comprises pulse repulsion electrode (4), surface discharge high-field electrode (1) and ground electrode (2), dielectric base (11), pulse repulsion electrode (4) is placed perpendicular to the axis of transference tube, on surface in pulse repulsion electrode (4) near drift region (12) one sides, be provided with tabular dielectric base (11), surface discharge high-field electrode (1) and ground electrode (2) are embedded in dielectric base (11), the discharge end of surface discharge high-field electrode (1) and ground electrode (2) is towards away from pulse repulsion electrode (4) one sides, and the projection space of their discharge end on pulse repulsion electrode (4), form surface discharge district (3) in dielectric base (11) away from pulse repulsion electrode (4) one side surfaces.
2. surface discharge ionization source as claimed in claim 1, it is characterized in that: described surface discharge high-field electrode (1) and ground electrode (2) are embedded in dielectric base (11) inside, and the spacing of the two is greater than electric discharge high-field electrode (1) and ground electrode (2) arrives the distance near (12) one side dielectric base (11) surfaces, drift region.
3. surface discharge ionization source as claimed in claim 1, is characterized in that: on described surface discharge high-field electrode (1), apply an alternating voltage, voltage is at 200V to 30kV, and frequency arrives 80kHz at 30Hz.
4. transference tube as claimed in claim 1, is characterized in that: drift region (12) are to be made up of coaxial electrode retaining collar group (7), and electrode retaining collar group (7) is electrically connected with control electrode, the formation drift region, space (12) in electrode retaining collar group (7); Be provided with and repel electrode retaining collar (6) near surface discharge ion source in electrode retaining collar group (7) left end, repel electrode retaining collar (6) coaxial with electrode retaining collar group (7).
5. transference tube as claimed in claim 1, it is characterized in that: the repulsion voltage applying on pulse repulsion electrode (4) when sample detection will higher than repel electrode retaining collar (6) electromotive force, repel electrode retaining collar (6) electromotive force higher than the electromotive force of electrode retaining collar group (7), pulsewidth is at 1us between 50ms, and the cycle is greater than 10ms; When accident sample, the upper no-voltage of pulse repulsion electrode (4) repels the voltage of electrode retaining collar (6) lower than the voltage of electrode retaining collar group (7) simultaneously, avoids producing ion interference signal.
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| CN201210395973.0A CN103779169B (en) | 2012-10-17 | 2012-10-17 | A kind of surface discharge ionization source-without ion gate transference tube |
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| CN201210395973.0A CN103779169B (en) | 2012-10-17 | 2012-10-17 | A kind of surface discharge ionization source-without ion gate transference tube |
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| CN103779169A true CN103779169A (en) | 2014-05-07 |
| CN103779169B CN103779169B (en) | 2016-01-06 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107026067A (en) * | 2017-04-10 | 2017-08-08 | 金华职业技术学院 | A kind of ionic migration spectrometer without ion shutter of use fast-pulse electron source |
| CN107393805A (en) * | 2017-08-02 | 2017-11-24 | 金华职业技术学院 | The device of photic separation is studied under a kind of low temperature |
| CN110828283A (en) * | 2019-11-15 | 2020-02-21 | 中国科学院大连化学物理研究所 | Hot surface ionization ion migration tube |
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- 2012-10-17 CN CN201210395973.0A patent/CN103779169B/en not_active Expired - Fee Related
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| CN107026067B (en) * | 2017-04-10 | 2018-12-14 | 金华职业技术学院 | A kind of ionic migration spectrometer without ion shutter using fast-pulse electron source |
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| CN103779169B (en) | 2016-01-06 |
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