CN115274399B - Low-pressure discharge plasma ion source device based on membrane sample injection - Google Patents
Low-pressure discharge plasma ion source device based on membrane sample injection Download PDFInfo
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- CN115274399B CN115274399B CN202210895421.XA CN202210895421A CN115274399B CN 115274399 B CN115274399 B CN 115274399B CN 202210895421 A CN202210895421 A CN 202210895421A CN 115274399 B CN115274399 B CN 115274399B
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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
- H01J49/04—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components
- H01J49/0422—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components for gaseous samples
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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
- H01J49/04—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components
- H01J49/0422—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components for gaseous samples
- H01J49/0427—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components for gaseous samples using a membrane permeable to gases
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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
- H01J49/04—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components
- H01J49/0431—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components for liquid samples
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/04—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components
- H01J49/0468—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components with means for heating or cooling the sample
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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
- H01J49/10—Ion sources; Ion guns
- H01J49/12—Ion sources; Ion guns using an arc discharge, e.g. of the duoplasmatron type
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention discloses a low-pressure discharge plasma ion source device based on membrane sample injection, which filters macromolecular impurities through a semipermeable membrane, greatly reduces the pollution probability of an ion source discharge cavity and is beneficial to sample detection and ion source maintenance; meanwhile, a conventional solid/liquid phase sample is introduced from a first sample inlet through wiping sample injection, and can be introduced through a second sample inlet when a high-volatility sample or a gas phase sample is detected, so that the detection range of the sample is enlarged; meanwhile, the first sample inlet and the second sample inlet can be combined, when the effect of directly detecting certain specific solid/liquid phase samples by using the first sample inlet is poor, certain specific high-volatile substances or gas-phase substances can be simultaneously introduced into the second sample inlet as doping agents to assist sample ionization, so that the ionization efficiency is remarkably improved.
Description
Technical Field
The invention relates to the technical field of mass spectrometry, in particular to a low-pressure discharge plasma ion source device based on membrane sample injection.
Background
The atmospheric pressure ionization technology has the outstanding advantages of no need of special ionization environment, omission or simplification of a sample pretreatment process, good soft ionization effect and the like, and various environmental ionization sources such as an electrospray ionization source (ESI), an atmospheric pressure chemical ionization source (APCI), a dielectric barrier discharge ion source (DBDI) and the like become popular choices of the portable mass spectrometer, so that the in-situ rapid detection of complex matrix samples can be realized.
In the vacuum ionization technology, the electron bombardment source (EI) has the longest application history, and has the characteristics of simple structure, high ionization efficiency, good reproducibility and the like, so that the electron bombardment source (EI) is most widely applied to various vacuum ionization sources and is often used together with chromatographic technology.
When the portable mass spectrometer is combined with an environment ionization source, taking a typical discontinuous atmospheric pressure sampling scheme as an example, in order to make the vacuum degree in the system meet the requirement, an atmospheric pressure interface of the portable mass spectrometer needs to use a capillary tube with larger flow resistance to strictly control the air inlet flow rate while ensuring ion transmission, however, the existence of the current limiting device greatly inhibits the effective transmission of ions, and the main reasons are as follows: first, the very small aperture at the capillary entrance limits the effective collection area of ions; second, the coulomb force of the ions in capillary transport drives the ions to diverge outwardly; third, the supersonic expansion effect caused by the large pressure differential at the capillary tail will cause further defocusing of the ions. Both research and experiments show that the ion loss rate in the transmission process is as high as more than 99%.
The EI source as a vacuum ionization source can reduce ion loss, but the principle is that high-energy electrons of 70eV are emitted by a filament to break gaseous molecules of a substance to be analyzed into fragment ions and recombine, and molecular information is obtained by comparison with a standard spectrum library. Therefore, when detecting non-single substances, the front end of the EI source is generally required to be combined with chromatographic separation, otherwise, mixed samples cannot be effectively analyzed, and the necessary sample pretreatment process obviously cannot meet the requirement of on-site quick detection.
Disclosure of Invention
The invention aims to solve the technical problem of providing a low-pressure discharge plasma ion source device based on membrane sample injection, which has reasonable structure, wide application range and high ionization efficiency and is applied to field detection.
In order to solve the above problems, the present invention provides a low-pressure discharge plasma ion source device based on film sample injection, comprising:
the sample feeding device comprises a sample feeding piece, wherein a first sample inlet is arranged on the sample feeding piece, a slot is arranged in the sample feeding piece, a solid/liquid phase sample can enter the slot through the first sample inlet, and a heating piece for heating the solid/liquid phase sample into gas phase molecules is arranged in the sample feeding piece;
the sample injection base is provided with a second sample injection port, a gas introduction cavity is arranged in the sample injection base, a gas phase sample or high volatile substances can enter the gas introduction cavity through the second sample injection port, a semipermeable membrane is arranged between the gas introduction cavity and the slot, a solid/liquid phase sample in the slot is heated into gas phase molecules, impurities are filtered through the semipermeable membrane and enter the gas introduction cavity, and the semipermeable membrane has tightness so as to maintain a low-pressure environment in the gas introduction cavity;
the plasma generation chamber is communicated with the gas introduction cavity, a discharge metal tube is arranged in the plasma generation chamber, the discharge metal tube carries high voltage, and the discharge metal tube and the counter electrode generate discharge to generate plasma so as to ionize sample molecules.
As a further improvement of the invention, an insulating part is connected between the sample feeding part and the counter electrode, a communication cavity which is used for communicating the plasma generating chamber and the gas introducing cavity is arranged in the insulating part, a probe is arranged on the insulating part, the probe penetrates through the insulating part from outside to inside and is connected with the discharge metal tube, and the probe introduces high voltage into the discharge metal tube.
As a further improvement of the present invention, a probe press block is connected to the insulating member, the probe press block presses down the probe to tightly press the probe against the discharge metal tube, and the probe press block is connected to a high voltage.
As a further improvement of the invention, a flange is arranged between the insulating piece and the counter electrode, the insulating piece and the counter electrode are connected with the flange through bolts or screws, and the flange is connected with the mass spectrum cavity.
As a further improvement of the invention, both sides of the semipermeable membrane are provided with membrane support nets for supporting the semipermeable membrane.
As a further improvement of the invention, a sealing gasket is arranged between the membrane supporting net of the semipermeable membrane, which is close to one side of the sample injection base, and the sample injection base.
As a further improvement of the invention, the heating element is a heating plate.
As a further improvement of the invention, a temperature monitoring member for detecting temperature is provided in the sample member.
As a further improvement of the invention, the second sample inlet is provided with a first capillary, and the first capillary is connected with a second capillary for controlling the discharge pressure of the ion source.
As a further improvement of the invention, the sample feeding piece is connected with the sample feeding base through bolts or screws.
The invention has the beneficial effects that:
the invention can realize sample ionization in an environment with higher vacuum degree, directly avoid ion transmission loss from an atmospheric pressure interface to the vacuum environment, and effectively improve the ion utilization rate.
Under the soft ionization effect, the invention can obviously observe the excimer ion peak and greatly improve the definite capacity.
The invention filters macromolecular impurities through the semipermeable membrane, greatly reduces the pollution probability of the discharge cavity of the ion source, and is beneficial to sample detection and ion source maintenance; meanwhile, a conventional solid/liquid phase sample is introduced from a first sample inlet through wiping sample injection, and can be introduced through a second sample inlet when a high-volatility sample or a gas phase sample is detected, so that the detection range of the sample is enlarged; meanwhile, the first sample inlet and the second sample inlet can be combined, when the effect of directly detecting certain specific solid/liquid phase samples by using the first sample inlet is poor, certain specific high-volatile substances or gas-phase substances can be simultaneously introduced into the second sample inlet as doping agents to assist sample ionization, so that the ionization efficiency is remarkably improved.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention, as well as the preferred embodiments thereof, together with the following detailed description of the invention, given by way of illustration only, together with the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a low-pressure discharge plasma ion source device based on membrane sample injection;
FIG. 2 is a schematic diagram of the whole structure of a low-pressure discharge plasma ion source device based on membrane sample injection;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a schematic diagram of the whole structure of the low-pressure discharge plasma ion source device based on membrane sample injection;
FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4;
FIG. 6 is a schematic view of a sample member according to the present invention;
FIG. 7 is a schematic diagram of a sample assembly according to the present invention;
FIG. 8 is an exploded view of a sample member of the present invention;
FIG. 9 is a schematic exploded view of the sample injection base and semipermeable membrane of the present invention;
FIG. 10 is a diagram of two configurations of an glow discharge;
FIG. 11 is a graph of ***e features detected by a low-pressure discharge plasma ion source device based on membrane sample injection;
FIG. 12 is a characteristic spectrum of TNT detected by a low-pressure discharge plasma ion source device based on membrane sample injection;
FIG. 13 is a characteristic spectrum of DMMP detected by a low-pressure discharge plasma ion source device based on membrane sample injection;
FIG. 14 is a characteristic spectrum of RDX-10ng detected by a low-pressure discharge plasma ion source device based on membrane sample injection;
FIG. 15 is a characteristic spectrum of RDX-10 ng+hexachloroethane doping detected by a low-pressure discharge plasma ion source device based on membrane sample injection.
Marking:
1. a sample feeding piece; 11. a first sample inlet; 12. a slot; 13. a heating member; 14. an end cap;
2. a sample injection base; 21. a second sample inlet; 22. a gas introduction chamber; 23. a first capillary;
31. a semipermeable membrane; 32. a membrane support net; 33. a sealing gasket;
4. a counter electrode; 41. a plasma generation chamber;
5. a discharge metal tube;
6. an insulating member; 61. a probe; 62. a probe pressing block;
7. and (3) a flange.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
As shown in fig. 1-9, a preferred embodiment of the present invention discloses a low-pressure discharge plasma ion source device based on membrane sample injection, which comprises a sample injection member 1, a sample injection base 2 and a counter electrode 4.
The sample feeding piece 1 is provided with a first sample feeding port 11, a slot 12 is arranged in the sample feeding piece 1, a solid/liquid phase sample can enter the slot 12 through the first sample feeding port 11, and a heating piece 13 for heating the solid/liquid phase sample into gas phase molecules is arranged in the sample feeding piece 1. Optionally, the heating element 13 is a heating plate.
The sample introduction base 2 is provided with a second sample introduction port 21, the sample introduction base 2 is internally provided with a gas introduction cavity 22, a gas phase sample or a high volatile substance can enter the gas introduction cavity 22 through the second sample introduction port 21, a semipermeable membrane 31 is arranged between the gas introduction cavity 22 and the slot 12, a solid/liquid phase sample in the slot 12 is heated into gas phase molecules, impurities are filtered through the semipermeable membrane 31 and enter the gas introduction cavity 22, and the semipermeable membrane 31 has tightness so as to maintain a low-pressure environment in the gas introduction cavity 22 and ensure the discharge air pressure requirement of an ion source. Optionally, the sample feeding member 1 is connected with the sample feeding base 2 by bolts or screws. Optionally, the semipermeable membrane 31 is made of Polydimethylsiloxane (PDMS).
The counter electrode 4 is grounded, a plasma generation chamber 41 is arranged in the counter electrode 4, the plasma generation chamber 41 is communicated with the gas introduction cavity 22, a discharge metal tube 5 is arranged in the plasma generation chamber 41, the discharge metal tube 5 carries high voltage, and discharge is generated between the discharge metal tube 5 and the counter electrode 4 to generate plasma so as to ionize sample molecules. Alternatively, the discharge metal tube 5 is made of stainless steel or the like.
The invention filters macromolecular impurities through the semipermeable membrane 31, greatly reduces the pollution probability of the discharge cavity of the ion source, and is beneficial to sample detection and ion source maintenance; meanwhile, a conventional solid/liquid phase sample is introduced from the first sample inlet 11 through wiping sample injection, and can be introduced through the second sample inlet 21 when a high-volatility sample or a gas phase sample is detected, so that the detection range of the sample is enlarged; meanwhile, the first sample inlet 11 and the second sample inlet 21 can be combined, when the effect of directly detecting some specific solid/liquid phase samples by using the first sample inlet 11 is poor, the second sample inlet 21 can simultaneously introduce some specific high-volatile substances or gas phase substances as doping agents to assist sample ionization, so that the ionization efficiency is remarkably improved.
As shown in fig. 3, in some embodiments, an insulating member 6 is connected between the sample member 1 and the counter electrode 4, a communication chamber for communicating the plasma generating chamber 41 with the gas introducing chamber 22 is provided in the insulating member 6, a probe 61 is provided on the insulating member 6, the probe 61 penetrates the insulating member 6 from outside to inside to be connected with the discharge metal tube 5, and the probe 61 introduces a high voltage into the discharge metal tube 5. The insulator 6 ensures that the sample introduction end is not pressurized, alternatively the insulator 6 is a PEEK material. Optionally, the probe 61 is an elastic probe, so that the probe 61 and the discharge metal tube 5 can be kept in a tight state at any time, and the stability of electric connection of the probe 61 and the discharge metal tube is ensured.
In one embodiment, the insulator 6 is connected with a probe pressing block 62, the probe pressing block 62 presses down the probe 61 to tightly press the probe 61 against the discharge metal tube 5, and the probe pressing block 62 is connected with a high voltage. Optionally, the probe press 62 is connected to the insulator 6 by bolts or screws.
In some embodiments, a flange 7 is arranged between the insulating member 6 and the counter electrode 4, the insulating member 6 and the counter electrode 4 are connected with the flange 7 through bolts or screws, and the flange 7 is connected with the mass spectrum cavity.
As shown in fig. 9, in some embodiments, both sides of the semipermeable membrane 31 are provided with a membrane support net 32 that supports the semipermeable membrane 31. The membrane support net 32 fixes the semipermeable membrane 31 in the middle of the membrane support net 32, and meanwhile, the membrane support net 32 is provided with holes in a large area, so that the contact area between the gas phase molecules of the sample and the semipermeable membrane 31 is increased, and the molecules are ensured to pass fully.
In one embodiment, a sealing gasket 33 is further disposed between the membrane support net 32 on the side of the semipermeable membrane 31 near the sample introduction base 2 and the sample introduction base 2. To ensure tightness between the sample introduction base 2 and the membrane support net 32. Optionally, the sealing gasket 33 is a PTFE film or silicone.
In some embodiments, a temperature monitoring element for detecting temperature is arranged in the sample feeding element 1, and optionally, the temperature monitoring element is a PT-100 platinum resistor. Further, the heating member 13 and the temperature monitoring member are fixed by the end cap 14.
Optionally, the first capillary 23 is connected to a second capillary, where the second capillary is used to control the sample flow, and the second capillaries with different specifications generate different sample flow, so that the gas pressure in the discharge area of the ion source is different, and in one embodiment, the specification of the selected capillary is 1/16 inch outside diameter, 0.18mm inside diameter, and 5cm length, and the final discharge gas pressure of the ion source is about 310Pa.
As shown in fig. 10, wherein the drawing (a) is a flat plate structure: when the air pressure in the closed container is low, the air is influenced by the voltage between the anode and the cathode to generate self-sustaining discharge, the thin air exists between the two electrodes in an ionic state in the discharge process, electrons are generated on the cathode plate by bombarding the cathode plate through acceleration, neutral atoms or molecules are excited, and the excited particles release energy in a blue-violet glow form when the excited state falls back to the ground state.
Fig. b is a cylindrical structure: two parallel metal electrodes with variable distances are used as cathodes of the discharge tube, and the anode is a circular ring A with larger diameter and filled with 133Pa neon. When the distance between the cathodes C1 and C2 is larger, normal glow discharge can be generated between A and C1 and C2, but when the distance between the two cathodes is shortened to a certain distance, the original two mutually noninterfere negative glow areas are combined together, and hollow cathode discharge occurs. The hollow cathode discharge is a special form of glow discharge, and the ion source design of the invention is based on the structure.
To demonstrate the effectiveness of the present invention, in one embodiment, mass spectra are shown in fig. 11 and 12, respectively, when samples of drug ***e (positive ion detection mode) and explosives TNT (negative ion detection mode) are detected using only thermal analysis wipe sample injection of the first sample inlet 11 (transfer of sample solution to high Wen Shi paper by standard pipette followed by insertion of the wipe into the sample slot).
In one embodiment, the mass spectrum of DMMP with high volatility (the reagent bottle containing DMMP is opened and placed under the second sample inlet 21) is directly detected by using the second sample inlet 21, as shown in fig. 13.
In one embodiment, the mass spectrum of RDX-10ng is detected using the first sample inlet 11 alone as shown in FIG. 14. When the first sample inlet 11 and the second sample inlet 21 are combined, that is, RDX is introduced into the first sample inlet 11, hexachloroethane is introduced into the second sample inlet 21 as doping, the effect is obviously improved, the mass spectrum detection spectrum is shown in figure 15 (because RDX is specific to Cl - Is higher than NO 2 - And NO 3 - Thus, after doping is introduced, the spectrum appears to be identical to Cl - The added single ion peak avoids other background interference and is easier to identify; whereas in terms of response performance, the signal intensity of its characteristic peak is improved by a factor of about 5 compared with that of the undoped one).
Referring to tables 1-3, in one embodiment, characteristic peaks of various species are listed (indicating that the ion source has good soft ionization effect).
TABLE 1 characteristic peaks of several drugs and their ionic expressions
| Sample of | m/z | Ion expression |
| K powder | 238 | [M+H] + |
| Cocaine | 304 | [M+H] + |
| Ice toxin | 150 | [M+H] + |
| Hemp (Cannabis sativa L.) L | 315 | [M+H] + |
| Heroin | 310,370 | [M+H-CH 3 COOH] + ,[M+H] + |
| Morphine | 268,286 | [M-H 2 O+H] + ,[M+H] + |
TABLE 2 characteristic peaks of several explosives and their ionic expressions
TABLE 3 characteristic peaks of several volatiles and their ionic expressions
| Sample of | m/z | Ion expression |
| Acetone (acetone) | 59 | [M+H] + |
| Dichloromethane (dichloromethane) | 84,86,88 | [M+H] + |
| Acetic acid n-butyl ester | 117 | [M+H] + |
| 2-heptanone | 115 | [M+H] + |
| DMMP | 125 | [M+H] + |
| Acetic acid | 61 | [M+H] + |
The above embodiments are merely preferred embodiments for fully explaining the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutions and modifications will occur to those skilled in the art based on the present invention, and are intended to be within the scope of the present invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. The utility model provides a low atmospheric pressure discharge plasma ion source device based on membrane advances kind which characterized in that includes:
the sample feeding device comprises a sample feeding piece, wherein a first sample inlet is arranged on the sample feeding piece, a slot is arranged in the sample feeding piece, a solid/liquid phase sample can enter the slot through the first sample inlet, and a heating piece for heating the solid/liquid phase sample into gas phase molecules is arranged in the sample feeding piece;
the sample injection base is provided with a second sample injection port, a gas introduction cavity is arranged in the sample injection base, a gas phase sample or high volatile substances can enter the gas introduction cavity through the second sample injection port, a semipermeable membrane is arranged between the gas introduction cavity and the slot, a solid/liquid phase sample in the slot is heated into gas phase molecules, impurities are filtered through the semipermeable membrane and enter the gas introduction cavity, and the semipermeable membrane has tightness so as to maintain a low-pressure environment in the gas introduction cavity;
the plasma generation chamber is communicated with the gas introduction cavity, a discharge metal tube is arranged in the plasma generation chamber, the discharge metal tube carries high voltage, and the discharge metal tube and the counter electrode generate discharge to generate plasma so as to ionize sample molecules.
2. The membrane sample introduction-based low-pressure discharge plasma ion source device according to claim 1, wherein an insulating member is connected between the sample introduction member and the counter electrode, a communication cavity for communicating the plasma generation chamber with the gas introduction cavity is arranged in the insulating member, a probe is arranged on the insulating member, the probe penetrates through the insulating member from outside to inside and is connected with the discharge metal tube, and the probe introduces high voltage into the discharge metal tube.
3. The membrane sample introduction-based low-pressure discharge plasma ion source device according to claim 2, wherein a probe press block is connected to the insulating member, the probe press block presses down the probe to tightly press the probe against the discharge metal tube, and the probe press block is connected to a high-voltage.
4. The membrane sample introduction-based low-pressure discharge plasma ion source device according to claim 2, wherein a flange is arranged between the insulating piece and the counter electrode, the insulating piece and the counter electrode are connected with the flange through bolts or screws, and the flange is connected with the mass spectrum cavity.
5. The membrane sample introduction-based low-pressure discharge plasma ion source device according to claim 1, wherein membrane support nets for supporting the semipermeable membrane are provided on both sides of the semipermeable membrane.
6. The membrane sample introduction-based low-pressure discharge plasma ion source device according to claim 5, wherein a sealing gasket is further arranged between the membrane support net on one side of the semi-permeable membrane close to the sample introduction base and the sample introduction base.
7. The film sample introduction-based low-pressure discharge plasma ion source device according to claim 1, wherein the heating member is a heating plate.
8. The membrane sample introduction-based low-pressure discharge plasma ion source device according to claim 1, wherein a temperature monitoring member for detecting a temperature is provided in the sample introduction member.
9. The membrane sample introduction-based low-pressure discharge plasma ion source device according to claim 1, wherein the second sample introduction port is provided with a first capillary tube, and the first capillary tube is connected with a second capillary tube for controlling the discharge pressure of the ion source.
10. The membrane sample introduction-based low-pressure discharge plasma ion source device according to claim 1, wherein the sample introduction member is connected with the sample introduction base by a bolt or a screw.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103545165A (en) * | 2013-10-29 | 2014-01-29 | 清华大学 | Mass spectrum ionization method based on cold plasma jets and ion source device |
| CN108630517A (en) * | 2018-05-10 | 2018-10-09 | 中国科学院大气物理研究所 | The plasma ionization method and device of Atmospheric particulates |
| CN114664636A (en) * | 2022-03-04 | 2022-06-24 | 苏州大学 | Air counter-flow ion source based on dielectric barrier discharge |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103545165A (en) * | 2013-10-29 | 2014-01-29 | 清华大学 | Mass spectrum ionization method based on cold plasma jets and ion source device |
| CN108630517A (en) * | 2018-05-10 | 2018-10-09 | 中国科学院大气物理研究所 | The plasma ionization method and device of Atmospheric particulates |
| CN114664636A (en) * | 2022-03-04 | 2022-06-24 | 苏州大学 | Air counter-flow ion source based on dielectric barrier discharge |
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