CN111223750A - A quick isolating device that is used for atmospheric pressure between ionization region and detection zone - Google Patents
A quick isolating device that is used for atmospheric pressure between ionization region and detection zone Download PDFInfo
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- CN111223750A CN111223750A CN201811411843.5A CN201811411843A CN111223750A CN 111223750 A CN111223750 A CN 111223750A CN 201811411843 A CN201811411843 A CN 201811411843A CN 111223750 A CN111223750 A CN 111223750A
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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
- H01J49/24—Vacuum systems, e.g. maintaining desired pressures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/26—Mass spectrometers or separator tubes
Abstract
The invention relates to a mass spectrometry instrument, in particular to a quick isolating device for air pressure between an ionization region and a detection region. The device comprises a VUV lamp, an ionization source cavity, an isolating device, a baffle valve, a vacuum gauge and a vacuum pump. A sample molecule sample inlet tube, an electrode group, a tetrafluoro insulating ring group, a Skimmer electrode and an isolating plate are respectively arranged in the ionization source cavity along the exit direction of the VUV lamp, and all the electrodes are of flat plate structures with middle round holes and are arranged in parallel, coaxially and in an insulating mode. The quick isolating device isolates the air pressure between an ionization region and a detection region by using a circular movable sealed structure, and separates the air pressure difference between the ionization region and the detection region. This novel quick isolating device technique has improved the efficiency of the ionization region device of dismantling mass spectrometry instrument greatly, and more convenient inspection is maintained and is changed the ionization region subassembly, has wide application prospect in mass spectrometry instrument structural design and reasonable dismouting structure.
Description
Technical Field
The invention relates to a mass spectrometry instrument, in particular to a quick isolating device for air pressure between an ionization region and a detection region. The quick isolating device is in a circular movable sealed structure, isolates air pressure between an ionization region and a detection region, and separates air pressure difference between the ionization region and the detection region. This novel quick isolating device technique has improved the efficiency of the ionization region device of dismantling mass spectrometry instrument greatly, and more convenient inspection is maintained and is changed the ionization region subassembly, has wide application prospect in mass spectrometry instrument structural design and reasonable dismouting structure.
Background
The mass spectrometer is a chemical analyzer with very high precision, but in order to improve the sensitivity and resolution, the components of the mass spectrometer need to be continuously modified to meet higher requirements. After the mass spectrometer works for a long time, a sample corrodes or adsorbs residues on the spectrometer, so that the spectrometer cannot work normally, and the spectrometer also needs to be disassembled for inspection and maintenance. However, the mass spectrometer is a precision instrument, a very complicated work flow is required for disassembly, assembly, maintenance, modification and the like, and the mass spectrometer needs to be an instrument which can detect under the condition of high vacuum degree, so the disassembly and assembly of the instrument needs to recover the internal vacuum degree of the instrument, and the process of disassembling and assembling the instrument at each time is complicated and troublesome, and extremely consumes time and labor.
Therefore, it is of great importance to develop a quick isolation device for the air pressure between the ionization region and the detection region.
Disclosure of Invention
The invention aims to provide a quick isolating device for air pressure between an ionization area and a detection area. The quick isolating device is in a circular movable sealed structure, isolates air pressure between an ionization region and a detection region, and separates air pressure difference between the ionization region and the detection region. This novel quick isolating device technique has improved the efficiency of the ionization region device of dismantling mass spectrometry instrument greatly, and more convenient inspection is maintained and is changed the ionization region subassembly, has wide application prospect in mass spectrometry instrument structural design and reasonable dismouting structure.
In order to achieve the purpose, the invention adopts the technical scheme that:
the ionization source comprises a VUV lamp and a closed ionization source cavity, wherein a through hole is formed in the side wall surface of the ionization source cavity, the through hole is connected with a vacuum pump through a baffle valve, and a vacuum gauge for measuring the vacuum degree in the cavity is arranged on the side wall surface of the ionization source cavity; the lower part of the ionization source cavity is hermetically connected with a Skimmer electrode, the wall surface of the lower part of the ionization source cavity is provided with a through hole corresponding to the middle through hole of the Skimmer electrode, the through hole is used as an ion outlet, and ions are ejected through the middle through hole of the Skimmer electrode after passing through the ion outlet; the method is characterized in that:
an isolation device is arranged at the lower part of the Skimmer electrode;
the VUV lamp is positioned at the upper part of the ionization source cavity, the light outlet of the VUV lamp is arranged in the ionization source cavity, the inside of the ionization source cavity is provided with an annular electrode group and an annular insulating ring group, and light emitted by the VUV lamp sequentially passes through a through hole in the middle of the electrode group, a through hole in the middle of the tetrafluoro insulating ring group, an ion outlet, a Skimmer electrode and an isolating device;
the annular electrode group consists of 2 or more than 3 plate-shaped pole pieces with through holes in the middle; the adjacent pole pieces are spaced by an insulating ring; the tetrafluoro insulating ring group is formed by 1 or more than 2 sheet tetrafluoro insulating rings with through hole plate-shaped middle parts; the middle through holes of the annular electrode group and the annular insulating ring group are coaxial;
the sample molecule sampling tube penetrates through the wall surface of the ionization source cavity and extends into the ionization source cavity; the outlet end of the sample molecule sample inlet pipe penetrates through a first Teflon insulating ring close to the VUV lamp and radially extends into a position between a first pole piece and a second pole piece close to the VUV lamp along the through hole;
the isolation device is composed of 3-64 block-shaped plate-shaped sealing sliding blocks with the same size and two arc-shaped edges protruding clockwise or anticlockwise; a groove is arranged on one arc-shaped edge of the sealing slide block, a bulge corresponding to the groove is arranged on the other arc-shaped edge, 3-64 blocks are sequentially arranged at equal intervals along the clockwise or anticlockwise direction to form a circular isolating device, every two adjacent sealing slide blocks are inserted into the groove end of the other sealing slide block in a sliding manner from end bulges to carry out reciprocating sealed insertion or separation, a connecting rod is arranged at the edge of the lower surface of each sealing slide block, which is far away from the central axis of the circle, and the connecting rod moves the sealing slide blocks to realize the opening or closing function of the isolating device;
the Skimmer electrode and the cylindrical fixing frame can be connected in a sliding way up and down; the connecting rod of the isolating device is fixedly connected with the bottom surface of the fixed frame, and the middle part of the bottom surface of the fixed frame is provided with a through hole; a sealing O ring for sealing is arranged between the Skimmer electrode and the isolating device, and the middle through hole of the Skimmer electrode, the sealing O ring and the isolating device are coaxial.
The isolation device consists of n sealing sliding blocks with the same shape and size, wherein n is an integer of 3-64, each sealing sliding block comprises a first flat plate surface and a second flat plate surface, the surfaces of the first flat plate surfaces are sequentially connected by three arc line segment end points, and the n first flat plate surfaces are sequentially placed clockwise or anticlockwise at equal intervals to form a hollow circular ring; the first of the three arcs of the first flat plate-shaped plate surface is an arc line on the excircle of the 1/n radian ring; the second arc line and the third arc line are arc lines which respectively protrude clockwise or anticlockwise from one point A of the inner circle of the circular ring and two end points of the first arc line; the n points A are uniformly distributed on the inner circle of the circular ring; a connecting rod is arranged on the lower surface of the edge of the plate surface close to the first arc line;
a V-shaped protrusion is arranged on the side edge of the flat plate where the second arc line is located, and the second flat plate-shaped plate surface is arranged; the V-shaped protrusion is formed by extending the lower surfaces of the side edges to the side far away from the first flat plate-shaped plate surface and gradually shrinking inwards to the middle part along the extending direction; a triangular notch penetrating through the plate surface is arranged on the second flat plate-shaped plate surface close to the point A, one side edge of the triangular notch is positioned on the flat plate side edge where the second arc line is positioned, the second side edge is positioned on the second flat plate-shaped plate surface, and the third side edge is an opening of the notch;
a V-shaped groove which is correspondingly matched with the V-shaped protrusion is arranged on the side edge of the flat plate where the third arc line is located, and the V-shaped groove is formed by extending the lower surface of the side edge inwards the plate surface and gradually shrinking inwards to the middle part along the extension;
the sealing slide block can rotate around the shaft by taking a point which is vertical to the second flat plate-shaped plate surface and passes through the opening close to the notch on the plate surface as the shaft.
The pole piece forming the electrode group, the insulating ring forming the tetrafluoro insulating ring group, the Skimmer electrode and the isolating device are all flat plate structures with through holes in the middle, and are all placed in parallel, insulated and coaxial; the sample molecule outlet faces the central through-hole region of the electrode set.
The electrode group, the tetrafluoro insulating ring group and the Skimmer electrode are circular or square circular pole pieces, and the isolating device is formed by splicing sealing sliding blocks; the material is stainless steel and other metals or pole pieces with metal plated on the surface; the number of the electrode group pole pieces is 2 or more than 3; the aperture of the pole piece is 1-50 mm.
Applying different axial voltages to the electrode group, the tetrafluoro insulating ring group, the Skimmer electrode and the isolating device in sequence from high to low and forming a transmission electric field with the size of 5-500V/cm in the axial direction, wherein the electric field can be uniform or non-uniform; the degree of vacuum in the ionization source chamber is maintained at 1Torr to 10 Torr. .
The diameter of a small hole between the Skimmer electrode and the isolating device is 0.5-5 mm.
3-64 connecting rods are sequentially hinged through flexible hinges.
The sealed sliding blocks of the quick isolating device for the air pressure between the ionization region and the detection region can be connected in a seamless mode, and the center connection position of the sealed sliding blocks can be sealed in a closed mode.
The UV lamp is lighted to irradiate the ultraviolet light and sample molecules injected through the sample molecule injection tube to generate low-pressure charge transfer reaction, and the ultraviolet light required by the charge transfer reaction ionization is generated by the VUV lamp; the electrode group, the tetrafluoro insulating ring group, the Skimmer electrode and the hollow area of the isolation device form a charge transfer reaction ionization reaction area together.
The ions obtained by ionization are directly introduced into a mass analyzer through a Skimmer electrode and a middle small hole of an isolating device; the mass analyzer is a time-of-flight mass analyzer, a quadrupole mass analyzer or an ion trap mass analyzer.
The quick isolating device for the air pressure between the ionization area and the detection area can quickly isolate the ionization area and the detection area under different air pressures, can quickly replace ionization area components, and can keep the air pressure of the detection area unchanged. The mass spectrometer has wide application prospect in structural design and reasonable disassembly and assembly structures of mass spectrometer instruments.
Drawings
FIG. 1 is a schematic diagram of a fast isolation device for air pressure between an ionization region and a detection region according to the present invention;
the vacuum ionization source comprises a 1VUV lamp and a closed 2 ionization source cavity, wherein a through hole is formed in one side wall surface of the 2 ionization source cavity, 10 through holes are connected with a 9 vacuum pump through baffle valves, an 8-degree vacuum gauge is arranged on the side wall surface of the 2 ionization source cavity, and an 11-electrode group, a 5-tetrafluoro insulating ring group, a 6Skimmer electrode and an 8-degree isolation device are sequentially arranged in the light ray emergent direction of the 1VUV lamp;
FIG. 2 is a diagram of the components of a quick isolation device for air pressure between an ionization region and a detection region of the present invention;
FIG. 3 is a schematic view of a quick isolation device for air pressure between an ionization region and a detection region according to the present invention;
Detailed Description
Fig. 1 is a schematic structural diagram of the present invention.
A fast isolating device for air pressure between an ionization region and a detection region comprises a VUV lamp 1 and a closed ionization source cavity 2, wherein a through hole is formed in the side wall surface of the ionization source cavity 2 and is connected with a vacuum pump 10 through a baffle valve 11, and a vacuum gauge 9 for measuring the vacuum degree in the cavity is arranged on the side wall surface of the ionization source cavity 2; the lower part of the ionization source cavity 2 is hermetically connected with a Skimmer electrode 6, the wall surface of the lower part of the ionization source cavity 2 is provided with a through hole corresponding to the middle through hole of the Skimmer electrode 6 and used as an ion outlet 7, and ions pass through the ion outlet 7 and then are ejected through the middle through hole of the Skimmer electrode 6; the method is characterized in that:
an isolation device 8 is arranged at the lower part of the Skimmer electrode 6;
the VUV lamp 1 is positioned at the upper part of the ionization source cavity 2, the light outlet of the VUV lamp 1 is arranged in the ionization source cavity 2, an annular electrode group and an annular insulating ring group are arranged in the ionization source cavity 2, and light emitted by the VUV lamp 1 sequentially passes through a through hole in the middle of the electrode group 12, a through hole in the middle of the tetrafluoro insulating ring group, an ion outlet, a Skimmer electrode 6 and an isolating device 8;
the annular electrode group 13 is composed of 2 or more than 3 plate-shaped pole pieces with through holes in the middle; the adjacent pole pieces are spaced by an insulating ring; a tetrafluoro insulating ring group 5 is formed by 1 or more than 2 sheet tetrafluoro insulating rings with through hole plate-shaped middle parts; the annular electrode group 13 is coaxial with the middle through hole of the annular insulating ring group 5;
the sample molecule sampling tube penetrates through the wall surface of the ionization source cavity and extends into the ionization source cavity; the outlet end of the sample molecule sample inlet pipe penetrates through a first Teflon insulating ring close to the VUV lamp and radially extends into a position between a first pole piece and a second pole piece close to the VUV lamp along the through hole;
the isolation device 8 consists of 3-64 block-shaped plate-shaped sealing sliding blocks 13 with the same size and two arc-shaped edges protruding clockwise or anticlockwise; a groove is arranged on one arc-shaped edge of the sealing sliding block 13, a bulge corresponding to the groove is arranged on the other arc-shaped edge, 3-64 blocks are sequentially arranged at equal intervals along the clockwise or anticlockwise direction to form a circular isolating device, every two adjacent sealing sliding blocks 13 are inserted into the groove end of the other sealing sliding block 13 in a sliding mode from end bulges to carry out reciprocating sealed insertion or separation, a connecting rod is arranged at the edge of the lower surface of each sealing sliding block 13, which is far away from the central axis of the circle, and the sealing sliding blocks 13 are moved by the connecting rod to realize the opening or closing function of the isolating device;
a cylinder-shaped fixing frame with an opening at the upper end and a sealed lower end, the Skimmer electrode 6 and the isolating device 8 are arranged in the cylinder-shaped fixing frame, the peripheral edge of the Skimmer electrode 6 is hermetically connected with the inner wall surface of the cylinder-shaped fixing frame through a sealing O ring, and the Skimmer electrode 6 and the cylinder-shaped fixing frame can be connected in a vertical sliding way; the connecting rod of the isolating device 8 is fixedly connected with the bottom surface of the fixed frame, and the middle part of the bottom surface of the fixed frame is provided with a through hole; a sealing O ring for sealing is arranged between the Skimmer electrode 6 and the isolating device 8, and the middle through hole of the Skimmer electrode 6, the sealing O ring and the isolating device 8 are coaxial.
The isolation device 8 is composed of n sealing sliding blocks 13 with the same shape and size, n is an integer of 3-64, each sealing sliding block 13 comprises a first flat plate surface and a second flat plate surface, the surfaces of the first flat plate surfaces are sequentially connected through three arc line segment end points, and the n first flat plate surfaces are sequentially placed clockwise or anticlockwise at equal intervals to form a hollow circular ring; the first of the three arcs of the first flat plate-shaped plate surface is an arc line on the excircle of the 1/n radian ring; the second arc line and the third arc line are arc lines which respectively protrude clockwise or anticlockwise from one point A of the inner circle of the circular ring and two end points of the first arc line; the n points A are uniformly distributed on the inner circle of the circular ring; a connecting rod is arranged on the lower surface of the edge of the plate surface close to the first arc line;
a V-shaped protrusion is arranged on the side edge of the flat plate where the second arc line is located, and the second flat plate-shaped plate surface is arranged; the V-shaped protrusion is formed by extending the lower surfaces of the side edges to the side far away from the first flat plate-shaped plate surface and gradually shrinking inwards to the middle part along the extending direction; a triangular notch penetrating through the plate surface is arranged on the second flat plate-shaped plate surface close to the point A, one side edge of the triangular notch is positioned on the flat plate side edge where the second arc line is positioned, the second side edge is positioned on the second flat plate-shaped plate surface, and the third side edge is an opening of the notch;
a V-shaped groove which is correspondingly matched with the V-shaped protrusion is arranged on the side edge of the flat plate where the third arc line is located, and the V-shaped groove is formed by extending the lower surface of the side edge inwards the plate surface and gradually shrinking inwards to the middle part along the extension;
the sealing slider 13 can rotate around the shaft by taking a point which is vertical to the second flat plate-shaped plate surface and passes through the opening of the plate surface close to the notch as the shaft.
The pole piece forming the electrode group 12, the insulating ring forming the tetrafluoro insulating ring group 5, the Skimmer electrode 6 and the isolating device 8 are all flat plate structures with through holes in the middle, and are all placed in parallel, insulated and coaxial; the sample molecule outlet faces the central through-hole region of the electrode set 12.
The electrode group 12, the tetrafluoro insulating ring group 5 and the Skimmer electrode 6 are circular or square circular pole pieces, and the isolating device 8 is formed by splicing a sealing sliding block 13; the material is stainless steel and other metals or pole pieces with metal plated on the surface; the number of the electrode group 12 is 2 or more than 3; the aperture of the pole piece is 1-50 mm.
Applying different axial voltages to the electrode group 12, the tetrafluoro insulating ring group 5, the Skimmer electrode 6 and the isolating device 8 in sequence from high to low and forming a transmission electric field with the size of 5-500V/cm in the axial direction, wherein the electric field can be uniform or non-uniform; the degree of vacuum in the ionization source chamber 2 was maintained at 1Torr to 10 Torr. .
The diameter of the small hole between the Skimmer electrode 6 and the isolating device 8 is 0.5-5 mm.
3-64 connecting rods are sequentially hinged through flexible hinges.
The sealed sliding blocks 13 of the quick isolating device for the air pressure between the ionization region and the detection region can be connected in a seamless mode, and the center connection position of the sealed sliding blocks 13 can be sealed in a closed mode.
The UV lamp 1 lights the irradiated ultraviolet light and sample molecules 4 injected through the sample molecule injection tube 3 to generate low-pressure charge transfer reaction, and the ultraviolet light required by the charge transfer reaction ionization is generated by the VUV lamp 1; the electrode group 11, the tetrafluoro insulating ring group 5, the Skimmer electrode 6 and the isolation device 8 form a charge transfer reaction ionization reaction area together in the hollow area.
The ions 7 obtained by ionization are directly introduced into the mass analyzer through the Skimmer electrode 6 and the middle aperture of the isolation device 8; the mass analyzer is a time-of-flight mass analyzer, a quadrupole mass analyzer or an ion trap mass analyzer.
Claims (10)
1. A quick isolating device for the air pressure between the ionized region and the detecting region,
the ionization source device comprises a VUV lamp (1) and a closed ionization source cavity (2), wherein a through hole is formed in the side wall surface of the ionization source cavity (2), the through hole is connected with a vacuum pump (10) through a baffle valve (11), and a vacuum gauge (9) for measuring the vacuum degree in the cavity is arranged on the side wall surface of the ionization source cavity (2); the Skimmer electrode (6) is hermetically connected with the lower part of the ionization source cavity (2), a through hole corresponding to the middle through hole of the Skimmer electrode (6) is formed in the wall surface of the lower part of the ionization source cavity (2) and serves as an ion outlet (7), and ions are ejected through the middle through hole of the Skimmer electrode (6) after passing through the ion outlet (7); the method is characterized in that:
an isolation device (8) is arranged at the lower part of the Skimmer electrode (6);
the VUV lamp (1) is positioned at the upper part of the ionization source cavity (2), a light outlet of the VUV lamp (1) is arranged in the ionization source cavity (2), an annular electrode group and an annular insulating ring group are arranged in the ionization source cavity (2), and light emitted by the VUV lamp (1) sequentially passes through a through hole in the middle of the electrode group (12), a through hole in the middle of the tetrafluoro insulating ring group, an ion outlet, a Skimmer electrode (6) and an isolating device (8);
the annular electrode group (13) is composed of 2 or more than 3 plate-shaped pole pieces with through holes in the middle; the adjacent pole pieces are spaced by an insulating ring; a tetrafluoro insulating ring group (5) is formed by 1 or more than 2 sheet tetrafluoro insulating rings with through holes in the middle; the annular electrode group (13) and the annular insulating ring group (5) are coaxial in the middle through hole;
the sample molecule sampling tube penetrates through the wall surface of the ionization source cavity and extends into the ionization source cavity; the outlet end of the sample molecule sample inlet pipe penetrates through a first Teflon insulating ring close to the VUV lamp and radially extends into a position between a first pole piece and a second pole piece close to the VUV lamp along the through hole;
the isolating device (8) is composed of 3-64 block-shaped plate-shaped sealing sliding blocks (13) with the same size and two arc-shaped edges protruding clockwise or anticlockwise; a groove is arranged on one arc-shaped edge of each sealing sliding block (13), a bulge corresponding to the groove is arranged on the other arc-shaped edge, 3-64 blocks are sequentially arranged at equal intervals along the clockwise or anticlockwise direction to form a circular isolating device, each two adjacent sealing sliding blocks (13) are inserted into the groove end of the other sealing sliding block (13) in a sliding mode through end bulges to carry out reciprocating sealed insertion or separation, a connecting rod is arranged at the edge of the lower surface of each sealing sliding block (13) far away from the central axis of the circle, and the sealing sliding blocks (13) are moved through the connecting rod to realize the opening or closing function of the isolating device;
the Skimmer electrode (6) and the isolating device (8) are arranged in the cylindrical fixing frame, the peripheral edge of the Skimmer electrode (6) is hermetically connected with the inner wall surface of the cylindrical fixing frame through a sealing O ring, and the Skimmer electrode (6) and the cylindrical fixing frame can be connected in a vertically sliding manner; the connecting rod of the isolating device (8) is fixedly connected with the bottom surface of the fixed frame, and the middle part of the bottom surface of the fixed frame is provided with a through hole; a sealing O ring for sealing is arranged between the Skimmer electrode (6) and the isolating device (8), and the middle through hole of the Skimmer electrode (6), the sealing O ring and the isolating device (8) are coaxial.
2. The device for the rapid isolation of air pressure between an ionization region and a detection region according to claim 1, wherein:
the isolation device (8) is composed of n sealing sliding blocks (13) with the same shape and size, n is an integer of 3-64, each sealing sliding block (13) comprises a first flat plate-shaped plate surface and a second flat plate-shaped plate surface, the surfaces of the first flat plate-shaped plates are sequentially connected through three arc line segment end points, and the n first flat plate-shaped plates are sequentially placed clockwise or anticlockwise at equal intervals to form a hollow circular ring; the first of the three arcs of the first flat plate-shaped plate surface is an arc line on the excircle of the 1/n radian ring; the second arc line and the third arc line are arc lines which respectively protrude clockwise or anticlockwise from one point A of the inner circle of the circular ring and two end points of the first arc line; the n points A are uniformly distributed on the inner circle of the circular ring; a connecting rod is arranged on the lower surface of the edge of the plate surface close to the first arc line;
a V-shaped protrusion is arranged on the side edge of the flat plate where the second arc line is located, and the second flat plate-shaped plate surface is arranged; the V-shaped protrusion is formed by extending the lower surfaces of the side edges to the side far away from the first flat plate-shaped plate surface and gradually shrinking inwards to the middle part along the extending direction; a triangular notch penetrating through the plate surface is arranged on the second flat plate-shaped plate surface close to the point A, one side edge of the triangular notch is positioned on the flat plate side edge where the second arc line is positioned, the second side edge is positioned on the second flat plate-shaped plate surface, and the third side edge is an opening of the notch;
a V-shaped groove which is correspondingly matched with the V-shaped protrusion is arranged on the side edge of the flat plate where the third arc line is located, and the V-shaped groove is formed by extending the lower surface of the side edge inwards the plate surface and gradually shrinking inwards to the middle part along the extension;
the sealing slide block (13) can rotate around a shaft by taking a point which is vertical to the second flat plate-shaped plate surface and passes through an opening close to the notch on the plate surface as the shaft.
3. The device for the rapid isolation of air pressure between an ionization region and a detection region according to claim 1, wherein:
the pole piece forming the electrode group (12), the insulating ring forming the tetrafluoro insulating ring group (5), the Skimmer electrode (6) and the isolating device (8) are all flat plate structures with through holes in the middle, and are all placed in parallel, insulated and coaxial; the sample molecule outlet faces the central through-hole region of the electrode set (12).
4. A device for the rapid isolation of the air pressure between the ionization and detection zones according to claim 1 or 3, characterized in that:
the electrode group (12), the tetrafluoro insulating ring group (5) and the Skimmer electrode (6) are circular or square ring-shaped pole pieces, and the isolation device (8) is formed by splicing sealing sliding blocks (13); the material is stainless steel and other metals or pole pieces with metal plated on the surface; the number of pole pieces of the electrode group (12) is 2 or more than 3; the aperture of the pole piece is 1-50 mm.
5. The device for the rapid isolation of air pressure between an ionization region and a detection region according to claim 1, wherein:
applying different axial voltages to the electrode group (12), the tetrafluoro insulating ring group (5), the Skimmer electrode (6) and the isolating device (8) in sequence from high to low and forming a transmission electric field with the size of 5-500V/cm in the axial direction, wherein the electric field can be uniform or non-uniform; the degree of vacuum in the ionization source chamber (2) is maintained at 1Torr to 10 Torr. .
6. The device for the rapid isolation of air pressure between an ionization region and a detection region according to claim 1, wherein:
the diameter of a small hole between the Skimmer electrode (6) and the isolating device (8) is 0.5-5 mm.
7. A device for the rapid isolation of the air pressure between the ionization and detection zones according to claim 1 or 2, characterized in that:
3-64 connecting rods are sequentially hinged through flexible hinges.
8. A device for the rapid isolation of the air pressure between the ionization and detection zones according to claim 1 or 2, characterized in that:
the sealed sliding blocks (13) of the quick isolating device for the air pressure between the ionization region and the detection region can be connected in a seamless mode, and the connecting position of the centers of the sealed sliding blocks (13) can be sealed in a closed mode.
9. The device for the rapid isolation of air pressure between an ionization region and a detection region according to claim 1, wherein:
the VUV lamp (1) lights the irradiated ultraviolet light and the sample molecules (4) injected through the sample molecule injection tube (3) to generate low-pressure charge transfer reaction, and the ultraviolet light required by the charge transfer reaction ionization is generated by the VUV lamp (1); the hollow areas of the electrode group (11), the tetrafluoro insulating ring group (5), the Skimmer electrode (6) and the isolating device (8) jointly form a charge transfer reaction ionization reaction area.
10. The device for the rapid isolation of air pressure between an ionization region and a detection region according to claim 1, wherein:
the ions (7) obtained by ionization are directly introduced into the mass analyzer through the Skimmer electrode (6) and the middle small hole of the isolating device (8); the mass analyzer is a time-of-flight mass analyzer, a quadrupole mass analyzer or an ion trap mass analyzer.
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| CN112483433A (en) * | 2020-11-11 | 2021-03-12 | 上海裕达实业有限公司 | Portable instrument molecular pump with built-in vacuum sensor |
| CN112888135A (en) * | 2021-02-01 | 2021-06-01 | 北京环境特性研究所 | Plasma generator and electrode structure thereof |
| US11667992B2 (en) | 2021-07-19 | 2023-06-06 | Agilent Technologies, Inc. | Tip for interface cones |
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| CN103854953A (en) * | 2012-11-30 | 2014-06-11 | 中国科学院大连化学物理研究所 | Mass spectrum ionization source of vacuum ultraviolet lamp with no light window |
| CN104658849A (en) * | 2013-11-21 | 2015-05-27 | 中国科学院大连化学物理研究所 | Ionization source for nano array modified enhanced photoelectronic emission based on vacuum ultraviolet light |
| CN105632871A (en) * | 2014-10-28 | 2016-06-01 | 中国科学院大连化学物理研究所 | Mass spectrum chemical ionization source based on UV light emitting diode |
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| CN112888135A (en) * | 2021-02-01 | 2021-06-01 | 北京环境特性研究所 | Plasma generator and electrode structure thereof |
| US11667992B2 (en) | 2021-07-19 | 2023-06-06 | Agilent Technologies, Inc. | Tip for interface cones |
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