CN109449074A - A kind of Ion Extraction device for mass spectrograph ionization source - Google Patents
A kind of Ion Extraction device for mass spectrograph ionization source Download PDFInfo
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- CN109449074A CN109449074A CN201811550361.8A CN201811550361A CN109449074A CN 109449074 A CN109449074 A CN 109449074A CN 201811550361 A CN201811550361 A CN 201811550361A CN 109449074 A CN109449074 A CN 109449074A
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- 238000000605 extraction Methods 0.000 title claims abstract description 21
- 230000004323 axial length Effects 0.000 claims description 7
- 238000005286 illumination Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 8
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 239000011148 porous material Substances 0.000 abstract description 5
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 4
- 230000005686 electrostatic field Effects 0.000 abstract 1
- 150000002500 ions Chemical class 0.000 description 33
- 230000005684 electric field Effects 0.000 description 11
- 238000009826 distribution Methods 0.000 description 5
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000001819 mass spectrum Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
-
- 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
- H01J49/062—Ion guides
- H01J49/063—Multipole ion guides, e.g. quadrupoles, hexapoles
-
- 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
Abstract
The invention discloses a kind of Ion Extraction devices for mass spectrograph ionization source, including trap shape electrode, incident electrode, condenser lens and outgoing electrode；Vacuum ultraviolet discharge lamp is connect with trap shape electrode, and trap shape electrode, incident electrode, condenser lens and outgoing electrode are sequentially connected；Vacuum ultraviolet use for discharge lamp generates ion in ionized sample molecule, the electrostatic field formed between trap shape DC electrode and small pore electrod collects and draws ion for high efficiency, condenser lens is for further focusing and transmission ion, ion is by entering mass spectrometric mass analysis region after outgoing electrode, ion in larger ionization space can be focused, realize the high-efficiency transfer of ion, so as to further increase mass spectrometric detection sensitivity, have broad application prospects in terms of Mass Spectrometer Method.
Description
Technical field
The present invention relates to mass-spectrometric technique fields, and in particular to a kind of Ion Extraction device for mass spectrograph ionization source.
Background technique
Mass spectrograph is a kind of quality difference using sample ions to identify the instrument of sample to be tested ingredient, is widely answered
Use the detection fields such as biomass, food safety and environmental pollution.Mass spectrometric core component is by ionization source, mass analyzer
It is formed with ion detector etc..Different according to the mode of ionization, ionization source can be divided into electron impact ionization (EI), chemi-ionization
(CI) and photo-ionisation etc..In recent years, with vacuum ultraviolet light source, the especially development of vacuum ultraviolet discharge lamp technology, single photon
Ionization (SPI) technology is widely used in matter because of the features such as fragment ion that its ionization generates is few, cheap and easy to use
In spectrometer device.
However, generally there are biggish spatial distributions for ionization source intermediate ion, so that sample ions are being drawn, in transmission process
There are severe attritions, reduce mass spectrometric detection sensitivity.For example, vacuum ultraviolet discharge lamp ionization source often have it is biggish
Hot spot, electron impact ionization source also have biggish spatial distribution.Moreover, the light intensity of vacuum ultraviolet discharge lamp is weaker, ionization
Efficiency is relatively low, if benzene homologues are about 20Mb (1Mb=10- for the photoionization cross section at 10.6eV in photon energy
18cm2).It is sensitive that loss of ion during ionization source draw-out area and subsequent transmission will seriously reduce mass spectrometric detection
Degree.
Summary of the invention
The embodiment of the present invention is designed to provide a kind of Ion Extraction device for mass spectrograph ionization source, to solve
The problem of reducing mass spectrograph detection sensitivity due to the existing loss because of ion during ionization source draw-out area and subsequent transmission.
To achieve the above object, the technical solution of the embodiment of the present invention are as follows:
A kind of Ion Extraction device for mass spectrograph ionization source, including trap shape electrode, incident electrode, condenser lens and go out
Radio pole；
Ionization source is connect with trap shape electrode, and trap shape electrode, incident electrode, condenser lens and outgoing electrode are sequentially connected.
The embodiment of the present invention is further arranged to: ionization source is vacuum ultraviolet discharge lamp, the irradiation of vacuum ultraviolet discharge lamp
Direction and the equipotential surface central axis of trap shape electrode are mutually perpendicular to.
The embodiment of the present invention is further arranged to: the trap shape electrode inner wall be it is cylindric, offer five on trap shape electrode
A mounting hole, wherein four mounting holes are on the periphery of trap shape electrode and around the central axis circumference array of trap shape electrode point
Cloth, another mounting hole are located at the center of the one end of trap shape electrode far from incident electrode, vacuum ultraviolet discharge lamp and trap shape
One of mounting hole connection on electrode periphery.
The embodiment of the present invention is further arranged to: the center of the incident electrode offers entrance aperture, the diameter of entrance aperture
For 1~6mm.
The embodiment of the present invention is further arranged to: the diameter of the entrance aperture is 2mm.
The embodiment of the present invention is further arranged to: the axial length of the entrance aperture is 1~3mm.
The embodiment of the present invention is further arranged to: the axial length of the entrance aperture is 1mm.
The embodiment of the present invention is further arranged to: the irradiation area cross section of vacuum ultraviolet discharge lamp is that round and diameter is small
In 6mm.
The embodiment of the present invention is further arranged to: the inner diameter of the trap shape electrode is 20mm.
The embodiment of the present invention is further arranged to: the depth of the trap shape electrode is 25mm.
The embodiment of the present invention has the advantages that
1, the infiltration between trap shape electrode and small pore electrod is drawn electric field and can effectively be drawn in larger ionization space
By the sample ions that ionization is formed, the equipotential surface between trap shape electrode and small pore electrod is in bending, electric field action power direction
It is vertical with equipotential surface, and it is directed toward entrance aperture, to greatly improve the extraction and efficiency of transmission of sample ions；
2, trap shape electrode inner wall is cylindric, and trap shape electrode, incident electrode, condenser lens and outgoing electrode coaxially divide
Cloth, structure is simple, is easily installed.Mounting hole there are five being opened up on trap shape electrode, wherein circle of four mounting holes in trap shape electrode
It is distributed on circumferential surface and around the central axis circumference array of trap shape electrode, another mounting hole is located at trap shape electrode far from incident electrode
One end center, vacuum ultraviolet discharge lamp connect with one of mounting hole on trap shape electrode periphery.Wherein one
A mounting hole is used for input sample, remaining mounting hole connection vacuum pump avoids ionizing for vacuumizing trap shape electrode inner cavity
Ion molecule reaction occurs at source, reduces the mass spectra peak in addition to sample molecule；
3, incident electrode center offers entrance aperture, and outgoing electrode centers offer perforation hole, and condenser lens center opens up
There is focus channel, entrance aperture and perforation hole are located at the both ends of focus channel and are interconnected by focus channel, entrance aperture,
Focus channel and perforation hole are located along the same line, and ion concentration degree is higher, improve the sensitivity of detection.
Detailed description of the invention
Fig. 1 is the sectional view intercepted using the plane by trap shape electrode centers axis as cutting plane in the embodiment of the present invention；
Fig. 2 is that the motion profile mould of the equipotential curve and ion of ionized region in the electric field is embodied in the embodiment of the present invention
Quasi- schematic diagram.
Wherein,
1, vacuum ultraviolet discharge lamp；
2, trap shape electrode；21, mounting hole；
3, incident electrode；31, entrance aperture；
4, condenser lens；41, focus channel；
5, it is emitted electrode；51, perforation hole.
Specific embodiment
The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention..
Embodiment
A kind of Ion Extraction device for mass spectrograph ionization source, as shown in Figure 1, include trap shape electrode 2, incident electrode 3,
Condenser lens 4 and outgoing electrode 5；Ionization source is connect with trap shape electrode 2, trap shape electrode 2, incident electrode 3, condenser lens 4 and go out
Radio pole 5 is sequentially connected, and ionization source uses vacuum ultraviolet discharge lamp 1.
In conjunction with Fig. 2, a in Fig. 2 indicates the equipotential surface distribution curve between trap shape electrode 2 and incident electrode 3, the b in Fig. 2
Indicate the sample ions motion profile formed after ionization, the c in Fig. 2 indicates the irradiation area of vacuum ultraviolet discharge lamp 1.
When work, the sample molecule inside vacuum-ultraviolet light irradiation trap shape electrode 2 that vacuum ultraviolet discharge lamp 1 emits makes
It is ionized；Apply on trap shape electrode 2 and incident electrode 3 different voltage U2 and U3 (example: U2=15V and U3=0V), two electricity
Infiltration is formed between pole and draws electric field, and curved equipotential surface is sequentially distributed inside trap shape electrode 2.3 center of incident electrode opens up
There is entrance aperture 31, outgoing 5 center of electrode offers perforation hole 51, and 4 center of condenser lens offers focus channel 41, entrance aperture 31
The both ends of focus channel 41 are located at perforation hole 51 and are interconnected by focus channel 41, entrance aperture 31, focus channel
41 and perforation hole 51 be located along the same line, ion concentration degree is higher, improves the sensitivity of detection.Close to 2 bottom of trap shape electrode
The equipotential surface potential in portion is high, and the equipotential surface potential closer apart from incident electrode 3 is lower, and electric field line direction is vertical with equipotential surface；It is empty
Between the sample ions dispersed drawn by electric field force, gradually converged to entrance aperture 31, and accelerate to pass through entrance aperture 31 in the electric field；
Apply negative voltage U4 on condenser lens 4, focuses ion further in focus channel 41 by adjusting U4, mass spectrometric matter
Amount analyzed area is connect with perforation hole 51, and the ion after over-focusing enters mass spectrometric mass analysis region after passing through perforation hole 51
Domain.
Electric field is drawn in infiltration between trap shape electrode 2 and small pore electrod can effectively draw the warp in larger ionization space
Cross the sample ions that ionization is formed, equipotential surface between trap shape electrode 2 and small pore electrod is in bending, electric field action power direction with
Equipotential surface is vertical, and is directed toward entrance aperture 31, to greatly improve the extraction and efficiency of transmission of sample ions.
In the prior art, traditional ionization source often uses two pieces of plate electrode pieces, forms parallel extraction electric field, ion
There can be serious loss in spill process, main reason is that the sample ions of spatial dispersion can be pushed away by drawing electric field in parallel
Denounce on incident electrode 3, only the ion of a portion can be not suitable for larger ionization section feelings by entrance aperture 31
Shape, the extraction of sample ions and transmission efficiency is low.
The direction of illumination of vacuum ultraviolet discharge lamp 1 and the equipotential surface central axis of trap shape electrode 2 are mutually perpendicular to.Vacuum ultraviolet
The ion generated on light direction of illumination is equal to vacuum ultraviolet discharge lamp 1 in the spatial distribution size in 2 axial direction of trap shape electrode
Irradiation area cross section size (the irradiation area cross section of vacuum ultraviolet discharge lamp 1 is that round and diameter is less than 6mm).Ion exists
Translation energy difference obtained is smaller during being brought out ionization source, is conducive to focusing and biography of the ion in condenser lens 4
It is defeated.In addition, translation energy, which is distributed lesser ion, also helps detection perpendicularly into formula mass spectrograph to sample ions signal.
2 inner wall of trap shape electrode be it is cylindric, trap shape electrode 2, incident electrode 3, condenser lens 4 and outgoing electrode 5 are coaxial
Distribution, structure is simple, is easily installed.It is opened up on trap shape electrode 2 there are five mounting hole 21, wherein four mounting holes 21 are in trap shape electricity
It is distributed on the periphery of pole 2 and around the central axis circumference array of trap shape electrode 2, another mounting hole 21 is located at trap shape electrode 2
One of peace on the center of one end far from incident electrode 3, vacuum ultraviolet discharge lamp 1 and 2 periphery of trap shape electrode
It fills hole 21 to connect, another mounting hole 21 is used for input sample, remaining mounting hole 21 is unionized in trap shape electrode 2 for being discharged
Gas.
The depth (2 inner cavity of trap shape electrode is along axial length) of trap shape electrode 2 is 25mm, and the internal diameter of trap shape electrode 2 is
20mm, the diameter of entrance aperture 31 are 1~6mm, and the axial length of entrance aperture 31 is 1~3mm, the present embodiment preferably, entrance aperture
31 diameter is 2mm, and the axial length of entrance aperture 31 is 1mm.
Although above having used general explanation and specific embodiment, the present invention is described in detail, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements without departing from theon the basis of the spirit of the present invention are fallen within the scope of the claimed invention.
Claims (10)
1. a kind of Ion Extraction device for mass spectrograph ionization source, it is characterized in that: including trap shape electrode (2), incident electrode
(3), condenser lens (4) and outgoing electrode (5)；
Ionization source is connect with trap shape electrode (2), trap shape electrode (2), incident electrode (3), condenser lens (4) and outgoing electrode (5)
It is sequentially connected.
2. a kind of Ion Extraction device for mass spectrograph ionization source according to claim 1, it is characterized in that: ionization source is
Vacuum ultraviolet discharge lamp (1), the equipotential surface central axis phase of the direction of illumination and trap shape electrode (2) of vacuum ultraviolet discharge lamp (1)
It is mutually vertical.
3. a kind of Ion Extraction device for mass spectrograph ionization source according to claim 2, it is characterized in that: the trap shape
Electrode (2) inner wall be it is cylindric, opened up on trap shape electrode (2) there are five mounting hole (21), wherein four mounting holes (21) are in trap
It is distributed on the periphery of shape electrode (2) and around the central axis circumference array of trap shape electrode (2), another mounting hole (21) is located at
The center of the one end of trap shape electrode (2) far from incident electrode (3), vacuum ultraviolet discharge lamp (1) and trap shape electrode (2) circumference
One of mounting hole (21) connection on face.
4. a kind of Ion Extraction device for mass spectrograph ionization source according to claim 3, it is characterized in that: the incidence
The center of electrode (3) offers entrance aperture (31), and the diameter of entrance aperture (31) is 1~6mm.
5. a kind of Ion Extraction device for mass spectrograph ionization source according to claim 4, it is characterized in that: the incidence
The diameter in hole (31) is 2mm.
6. a kind of Ion Extraction device for mass spectrograph ionization source according to claim 4, it is characterized in that: the incidence
The axial length in hole (31) is 1~3mm.
7. a kind of Ion Extraction device for mass spectrograph ionization source according to claim 6, it is characterized in that: the incidence
The axial length in hole (31) is 1mm.
8. a kind of Ion Extraction device for mass spectrograph ionization source according to claim 2, it is characterized in that: vacuum ultraviolet
The irradiation area cross section of discharge lamp (1) is that round and diameter is less than 6mm.
9. a kind of Ion Extraction device for mass spectrograph ionization source according to claim 3, it is characterized in that: the trap shape
The inner diameter of electrode (2) is 20mm.
10. a kind of Ion Extraction device for mass spectrograph ionization source according to claim 3, it is characterized in that: the trap
The depth of shape electrode (2) is 25mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811550361.8A CN109449074B (en) | 2018-12-18 | 2018-12-18 | Ion extraction device for ionization source of mass spectrometer |
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|---|---|---|---|
| CN201811550361.8A CN109449074B (en) | 2018-12-18 | 2018-12-18 | Ion extraction device for ionization source of mass spectrometer |
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| CN109449074A true CN109449074A (en) | 2019-03-08 |
| CN109449074B CN109449074B (en) | 2024-02-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110176385A (en) * | 2019-05-29 | 2019-08-27 | 中国地质科学院地质研究所 | A kind of high-effect ionic source for magnetic mass spectrometer |
| CN110648895A (en) * | 2019-08-16 | 2020-01-03 | 上海裕达实业有限公司 | Mass spectrum device and method for detecting silicone oil leakage in freeze-drying process |
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| CN110648895A (en) * | 2019-08-16 | 2020-01-03 | 上海裕达实业有限公司 | Mass spectrum device and method for detecting silicone oil leakage in freeze-drying process |
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| CN109449074B (en) | 2024-02-06 |
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