CN115274399A - Low-pressure discharge plasma ion source device based on membrane sample introduction - Google Patents

Low-pressure discharge plasma ion source device based on membrane sample introduction Download PDF

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CN115274399A
CN115274399A CN202210895421.XA CN202210895421A CN115274399A CN 115274399 A CN115274399 A CN 115274399A CN 202210895421 A CN202210895421 A CN 202210895421A CN 115274399 A CN115274399 A CN 115274399A
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sample
membrane
ion source
introduction
source device
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CN115274399B (en
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李灵锋
陈玉
葛未
汪德汀
李鹏
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Suzhou University
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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
    • 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
    • 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
    • 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
    • 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

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  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)

Abstract

The invention discloses a low-pressure discharge plasma ion source device based on membrane sample introduction, 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 the first sample inlet through wiping sample introduction, and when a high-volatility sample or a gas phase sample is detected, the sample can be introduced through the second sample inlet, so that the detection range of the sample is expanded; meanwhile, the first sample inlet and the second sample inlet can be used in a combined mode, when the effect of directly detecting certain specific solid/liquid phase samples through the first sample inlet is poor, certain specific high-volatility substances or gas-phase substances can be introduced into the second sample inlet to serve as doping reagents to assist sample ionization, and ionization efficiency is improved remarkably.

Description

Low-pressure discharge plasma ion source device based on membrane sample introduction
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 introduction.
Background
Because the atmospheric pressure ionization technology has the outstanding advantages of no need of special ionization environment, capability of omitting or simplifying sample pretreatment process, good soft ionization effect and the like, 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 are now popular choices of portable mass spectrometers, and in-situ rapid detection of complex matrix samples can be realized.
In the vacuum ionization technology, an electron impact source (EI) has the longest application history, and has the characteristics of simple structure, high ionization efficiency, good reproducibility and the like, so the electron impact source is most widely applied to various vacuum ionization sources and is often combined with the chromatography technology.
When the portable mass spectrometer is combined with an environmental ionization source, taking a typical discontinuous atmospheric pressure sample injection scheme as an example, in order to enable the vacuum degree inside the system to meet the requirement, an atmospheric pressure interface of the portable mass spectrometer needs to utilize a capillary with a large flow resistance to strictly control the flow rate of inlet air while ensuring ion transmission, however, the existence of the current limiting device greatly inhibits the effective transmission of ions, and the reasons are mainly that: first, the very small aperture at the capillary inlet limits the effective collection area of the ions; secondly, coulomb force of the ions in capillary transmission drives the ions to diverge outwards; third, the supersonic expansion effect caused by the large pressure differential at the capillary tail end will cause the ions to further defocus. Both research and experiments show that the ion loss rate in the transmission process is up to more than 99%.
Although the EI source as the vacuum ionization source can reduce the ion loss, the principle is that the filament emits high-energy electrons of 70eV to break gaseous molecules of a substance to be analyzed into fragment ions, the fragment ions are recombined, and the fragment ions are compared with a standard spectrum library to acquire molecular information. Therefore, when detecting non-single substances, the EI source front end generally needs to be combined with chromatographic separation, otherwise, mixed samples cannot be analyzed effectively, and the necessary sample pretreatment process obviously cannot meet the requirement of on-site quick detection.
Disclosure of Invention
The invention aims to provide a low-pressure discharge plasma ion source device based on membrane sample introduction, which has the advantages of 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 apparatus based on membrane sample injection, comprising:
the solid/liquid phase sample injection device comprises a sample injection piece, a sample injection unit and a heating element, wherein a first sample injection port is arranged on the sample injection piece, a slot is formed in the sample injection piece, a solid/liquid phase sample can enter the slot through the first sample injection port, and the heating element for heating the solid/liquid phase sample into gas phase molecules is arranged in the sample injection piece;
the sample introduction device comprises a sample introduction base, wherein a second sample introduction port is formed in the sample introduction base, a gas introduction cavity is formed in the sample introduction base, a gas-phase sample or a high-volatility substance can enter the gas introduction cavity through the second sample introduction port, a semipermeable membrane is arranged between the gas introduction cavity and a slot, the solid/liquid-phase sample in the slot is heated into gas-phase molecules and then enters the gas introduction cavity after being filtered out of impurities by the semipermeable membrane, and the semipermeable membrane has sealing performance so as to maintain a low-pressure environment in the gas introduction cavity;
the counter electrode is grounded, a plasma generation chamber is arranged in the counter electrode and communicated with the gas introduction cavity, a discharge metal tube is arranged in the plasma generation chamber and carries high voltage, and the discharge metal tube and the counter electrode generate discharge to generate plasma and ionize sample molecules.
As a further improvement of the present invention, an insulating member is connected between the sample introduction member and the counter electrode, a communicating cavity for communicating the plasma generation chamber and the gas introduction cavity is provided in the insulating member, a probe is provided on the insulating member, the probe penetrates through the insulating member from outside to inside and is connected to the discharge metal tube, and the probe introduces a high voltage into the discharge metal tube.
As a further improvement of the invention, a probe pressing block is connected to the insulating part, the probe pressing block presses the probe downwards to enable the probe to be tightly abutted against the discharge metal tube, and the probe pressing block is connected with a high-voltage.
As a further improvement of the invention, a flange is arranged between the insulating part and the counter electrode, the insulating part and the counter electrode are both 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 semi-permeable membrane are provided with membrane supporting nets for supporting the semi-permeable membrane.
As a further improvement of the invention, a sealing gasket is arranged between the membrane supporting net of the semipermeable membrane close to one side of the sample injection base and the sample injection base.
As a further improvement of the present invention, the heating member is a heating sheet.
As a further improvement of the invention, a temperature monitoring part for detecting temperature is arranged in the sample injection part.
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 a bolt or a screw.
The invention has the beneficial effects that:
the invention can realize sample ionization in the environment with higher vacuum degree, directly avoid the ion transmission loss from the atmospheric pressure interface to the vacuum environment and effectively improve the ion utilization rate.
Under the action of soft ionization, the invention can obviously observe the quasi-molecular ion peak and greatly improve the qualitative ability.
According to the invention, macromolecular impurities are filtered by the semipermeable membrane, so that the pollution probability of the ion source discharge cavity is greatly reduced, and the sample detection and the ion source maintenance are facilitated; meanwhile, a conventional solid/liquid phase sample is introduced from the first sample inlet through wiping sample introduction, and when a high-volatility sample or a gas phase sample is detected, the sample can be introduced through the second sample inlet, so that the detection range of the sample is expanded; meanwhile, the first sample inlet and the second sample inlet can be used in a combined mode, when the effect of directly detecting certain specific solid/liquid phase samples through the first sample inlet is poor, certain specific high-volatility substances or gas-phase substances can be introduced into the second sample inlet to serve as doping reagents to assist sample ionization, and ionization efficiency is improved remarkably.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to 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 introduction according to the present invention;
FIG. 2 is a schematic diagram showing the overall structure of the low-pressure discharge plasma ion source device based on membrane sampling according to the present invention;
FIG. 3 isbase:Sub>A cross-sectional view taken along A-A of FIG. 2;
FIG. 4 is a schematic diagram of the overall structure of the low-pressure discharge plasma ion source device based on membrane sampling according to the present invention;
FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4;
FIG. 6 is a first schematic structural view of a sample inlet of the present invention;
FIG. 7 is a second schematic structural view of a sample inlet of the present invention;
FIG. 8 is an exploded view of a sample inlet of the present invention;
FIG. 9 is a schematic view of the sample inlet base and the semipermeable membrane according to the present invention;
FIG. 10 is two structural diagrams of glow discharge;
FIG. 11 is a cocaine characteristic spectrum detected by the low-pressure discharge plasma ion source device based on membrane sample injection according to the present invention;
FIG. 12 is a characteristic spectrum of TNT detected by the low-pressure discharge plasma ion source device based on membrane sample injection according to the present invention;
FIG. 13 is a characteristic spectrum of DMMP detected by the low-pressure discharge plasma ion source device based on membrane sampling according to the present invention;
FIG. 14 is a characteristic spectrum of RDX-10ng detected by the low-pressure discharge plasma ion source device based on membrane sampling according to the present invention;
FIG. 15 is a characteristic spectrum of RDX-10ng + hexachloroethane doping obtained by detection of the low-pressure discharge plasma ion source device based on membrane sample injection.
Description of the labeling:
1. a sample inlet piece; 11. a first sample inlet; 12. inserting slots; 13. a heating member; 14. an end cap;
2. a sample introduction base; 21. a second sample inlet; 22. a gas introduction chamber; 23. a first capillary tube;
31. a semi-permeable membrane; 32. a membrane support web; 33. sealing gaskets;
4. a counter electrode; 41. a plasma generation chamber;
5. a discharge metal tube;
6. an insulating member; 61. a probe; 62. pressing the probe;
7. a flange.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
As shown in fig. 1 to 9, the 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 inlet part 1 is provided with a first sample inlet 11, the sample inlet part 1 is internally provided with a slot 12, a solid/liquid phase sample can enter the slot 12 through the first sample inlet 11, and the sample inlet part 1 is internally provided with a heating element 13 for heating the solid/liquid phase sample into gas phase molecules. Alternatively, the heating member 13 is a heating sheet.
Be equipped with second introduction port 21 on the introduction base 2, be equipped with gaseous leading-in chamber 22 in the introduction base 2, gaseous phase sample or high volatile substance accessible second introduction port 21 get into gaseous leading-in chamber 22, be provided with pellicle 31 between gaseous leading-in chamber 22 and the slot 12, solid/liquid phase sample heating in the slot 12 is gaseous phase molecule after the gaseous phase filtration impurity of process pellicle 31 back and gets into gaseous leading-in chamber 22, pellicle 31 possesses the leakproofness in order to maintain the low pressure environment in the gaseous leading-in chamber 22, guarantee the discharge pressure requirement of ion source. Optionally, the sample inlet member 1 is connected with the sample inlet base 2 through bolts or screws. Alternatively, the semipermeable membrane 31 may be made of Polydimethylsiloxane (PDMS) or the like.
The counter electrode 4 is grounded, a plasma generating chamber 41 is arranged in the counter electrode 4, the plasma generating chamber 41 is communicated with the gas introducing cavity 22, a discharge metal tube 5 is arranged in the plasma generating chamber 41, the discharge metal tube 5 carries high voltage, the discharge metal tube 5 and the counter electrode 4 generate discharge to generate plasma, and sample molecules are ionized. Alternatively, the discharge metal tube 5 is made of stainless steel or the like.
According to the invention, macromolecular impurities are filtered by the semipermeable membrane 31, so that the pollution probability of the ion source discharge cavity is greatly reduced, and sample detection and ion source maintenance are facilitated; meanwhile, a conventional solid/liquid phase sample is introduced from the first sample inlet 11 through wiping sample introduction, 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 expanded; meanwhile, the first sample inlet 11 and the second sample inlet 21 can be used together, and when the effect of directly detecting certain specific solid/liquid phase samples by using the first sample inlet 11 is not good, the second sample inlet 21 can simultaneously introduce certain specific high volatile substances or gas phase substances as doping reagents to assist sample ionization, thereby remarkably improving the ionization efficiency.
As shown in fig. 3, in some embodiments, an insulating member 6 is connected between the sample injection member 1 and the counter electrode 4, a communicating cavity is provided in the insulating member 6 for communicating the plasma generation chamber 41 and the gas introduction cavity 22, a probe 61 is provided on the insulating member 6, the probe 61 penetrates through the insulating member 6 from outside to inside and is connected to the discharge metal tube 5, and the probe 61 introduces a high voltage into the discharge metal tube 5. The insulation 6 ensures that the sample inlet end is free of high voltage, and optionally, the insulation 6 is of PEEK material. Optionally, the probe 61 is an elastic probe, which can ensure that the probe 61 and the discharge metal tube 5 are constantly kept in a tightly-abutting state, and ensure the stability of electrical connection between the probe 61 and the discharge metal tube.
In one embodiment, the insulating member 6 is connected to a probe pressing block 62, the probe pressing block 62 presses the probe 61 downward to make the probe 61 tightly contact with the discharge metal tube 5, and the probe pressing block 62 is connected to a high voltage. Alternatively, the probe press block 62 is connected to the insulating member 6 by a bolt or a screw.
In some embodiments, a flange 7 is disposed between the insulator 6 and the counter electrode 4, the insulator 6 and the counter electrode 4 are both connected to the flange 7 by bolts or screws, and the flange 7 is connected to the mass spectrometer cavity.
As shown in fig. 9, in some embodiments, both sides of the semi-permeable membrane 31 are provided with membrane support nets 32 supporting the semi-permeable membrane 31. The membrane support net 32 fixes the semi-permeable membrane 31 in the middle of the membrane support net 32, and the membrane support net 32 is provided with a large-area hole, so that the contact area between the gas-phase molecules of the sample and the semi-permeable membrane 31 is increased, and the molecules can fully pass through.
In one embodiment, a sealing gasket 33 is further disposed between the membrane support net 32 of the semi-permeable membrane 31 close to one side of the sample introduction base 2 and the sample introduction base 2. To ensure the tightness between the sample introduction base 2 and the membrane support network 32. Optionally, the sealing gasket 33 is a PTFE membrane or silica gel.
In some embodiments, a temperature monitoring element for detecting temperature is disposed in the sample injection 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 an end cap 14.
Optionally, a second capillary is connected to the first capillary 23, the second capillary is used for controlling the sample flow rate, and the second capillaries with different specifications generate different sample flow rates, so that the discharge area of the ion source has different gas pressures, in one embodiment, the selected capillary has an outer diameter of 1/16 inch, an inner diameter of 0.18mm, a length of 5cm, 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 type structure: when the pressure in the closed container is low, the gas is influenced by the voltage between the anode and the cathode to generate self-sustaining discharge, the rarefied gas exists between the two electrodes in an ion state in the discharge process, and bombards a cathode plate to generate electrons through acceleration to excite neutral atoms or molecules, and the excited particles release energy in the form of blue-violet glow when falling back to the ground state from the excited state.
FIG. (b) shows a cylindrical structure: two parallel metal electrodes with variable distance are used as the cathode of the discharge tube, and the anode is a circular ring A with a 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 noninterference negative glow areas are combined together, and hollow cathode discharge is generated accordingly. Hollow cathode discharge is a special form of glow discharge, and the design of the ion source of the present invention is based on this structure.
To demonstrate the effectiveness of the present invention, in one embodiment, the mass spectrum characteristic spectra of the cocaine (positive ion detection mode) and TNT (negative ion detection mode) samples of explosives are detected using only thermal desorption wiping sample injection (by transferring the sample solution to a high temperature resistant wipe by a standard pipette, and then inserting the wipe into the sample injection slot) at the first sample injection port 11, as shown in fig. 11 and 12, respectively.
In one embodiment, the mass spectrum characteristic spectrum of the DMMP with high volatility directly detected only by the second sample inlet 21 (i.e. the reagent bottle containing the DMMP is opened and placed below the second sample inlet 21) is shown in fig. 13.
In one embodiment, the mass spectrum of RDX-10ng is detected by using the first sample inlet 11 alone, and the spectrum is shown in FIG. 14. When the first sample inlet 11 and the second sample inlet 21 are used together, namely, RDX is introduced into the first sample inlet 11, hexachloroethane is introduced into the second sample inlet 21 to significantly improve the effect after doping, and the mass spectrum detection spectrogram is shown in fig. 15 (because RDX is used for Cl)-Has a higher affinity than NO2 -And NO3 -Thus, after introduction of the doping, the spectra show Cl-The added single ion peak avoids other background interference and is easier to identify; and the signal intensity of the characteristic peak is improved by about 5 times in terms of response performance than that of the undoped characteristic peak).
Referring to tables 1-3, in one embodiment, characteristic peaks of various species are listed (illustrating that the ion source has good soft ionization).
TABLE 1 characteristic peaks and ion expressions of several drugs
Sample (I) m/z Ion expression formula
K powder 238 [M+H]+
Cocaine 304 [M+H]+
Ice toxin 150 [M+H]+
Cannabis sativa (Cannabis sativa L.) Linne 315 [M+H]+
Heroin 310,370 [M+H-CH3COOH]+,[M+H]+
Morphine (morphine) 268,286 [M-H2O+H]+,[M+H]+
TABLE 2 characteristic peaks of several explosives and their ion expressions
Figure BDA0003766101080000071
Figure BDA0003766101080000081
TABLE 3 characteristic peaks of several volatiles and their ionic expressions
Sample(s) m/z Ion expression formula
Acetone (II) 59 [M+H]+
Methylene dichloride 84,86,88 [M+H]+
Acetic acid n-butyl ester 117 [M+H]+
2-heptanone 115 [M+H]+
DMMP 125 [M+H]+
Acetic Acid (AA) 61 [M+H]+
The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.

Claims (10)

1. The utility model provides a low pressure discharge plasma ion source device based on membrane advances a kind which characterized in that includes:
the solid/liquid phase sample injection device comprises a sample injection piece, a sample injection unit and a heating element, wherein a first sample injection port is arranged on the sample injection piece, a slot is formed in the sample injection piece, a solid/liquid phase sample can enter the slot through the first sample injection port, and the heating element for heating the solid/liquid phase sample into gas phase molecules is arranged in the sample injection piece;
the sample introduction device comprises a sample introduction base, wherein a second sample introduction port is formed in the sample introduction base, a gas introduction cavity is formed in the sample introduction base, a gas-phase sample or a high-volatility substance can enter the gas introduction cavity through the second sample introduction port, a semipermeable membrane is arranged between the gas introduction cavity and a slot, the solid/liquid-phase sample in the slot is heated into gas-phase molecules and then enters the gas introduction cavity after being filtered out of impurities by the semipermeable membrane, and the semipermeable membrane has sealing performance so as to maintain a low-pressure environment in the gas introduction cavity;
the counter electrode is grounded, a plasma generation chamber is arranged in the counter electrode and communicated with the gas introduction cavity, a discharge metal tube is arranged in the plasma generation chamber and carries high voltage, and the discharge metal tube and the counter electrode generate discharge to generate plasma and ionize sample molecules.
2. The film sampling-based low-pressure discharge plasma ion source device according to claim 1, wherein an insulating member is connected between the sampling member and the counter electrode, a communicating cavity for communicating the plasma generation chamber with the gas introduction cavity is provided in the insulating member, a probe is provided 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 a high voltage into the discharge metal tube.
3. The membrane-based sample injection low-pressure discharge plasma ion source device as claimed in claim 2, wherein a probe pressing block is connected to the insulating member, the probe pressing block presses the probe downward to make the probe abut against the discharge metal tube, and the probe pressing block is connected to a high voltage.
4. The low-pressure discharge plasma ion source device based on membrane sampling according to claim 2, wherein a flange is arranged between the insulating part and the counter electrode, the insulating part and the counter electrode are both connected with the flange through bolts or screws, and the flange is connected with the mass spectrum cavity.
5. The membrane-based sample introduction low-pressure discharge plasma ion source device according to claim 1, wherein both sides of the semi-permeable membrane are provided with membrane supporting nets supporting the semi-permeable 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 supporting net on one side of the semi-permeable membrane close to the sample introduction base and the sample introduction base.
7. The membrane-based sampling low-pressure discharge plasma ion source device according to claim 1, wherein the heating member is a heating sheet.
8. The membrane-sample-introduction-based low-pressure discharge plasma ion source device according to claim 1, wherein a temperature monitoring member for detecting temperature is provided in the introduction member.
9. The membrane-based sample injection low-pressure discharge plasma ion source device as claimed in claim 1, wherein the second injection port 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.
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 through a bolt or a screw.
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Citations (2)

* Cited by examiner, † Cited by third party
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

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CN114664636B (en) * 2022-03-04 2023-03-24 苏州大学 Air counter-flow ion source based on dielectric barrier discharge

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* Cited by examiner, † Cited by third party
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

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