CN111223748B - Photo-ionization source device for enhancing ion transmission by utilizing charge saturation - Google Patents
Photo-ionization source device for enhancing ion transmission by utilizing charge saturation Download PDFInfo
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- CN111223748B CN111223748B CN201811411830.8A CN201811411830A CN111223748B CN 111223748 B CN111223748 B CN 111223748B CN 201811411830 A CN201811411830 A CN 201811411830A CN 111223748 B CN111223748 B CN 111223748B
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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
- H01J49/16—Ion sources; Ion guns using surface ionisation, e.g. field-, thermionic- or photo-emission
- H01J49/161—Ion sources; Ion guns using surface ionisation, e.g. field-, thermionic- or photo-emission using photoionisation, e.g. by laser
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Abstract
The invention provides an ionization source device based on charge saturation enhanced ion transmission. The method has the advantages that the hollow insulating tube is used as the ionization channel and the sample gas conveying pipeline of the photoionization source, the invalid volume in the ionization source is greatly reduced, and the method has the following advantages: the insulating pipe wall can not generate photoelectrons when being irradiated by light, so that the photoelectron ionization effect in other patents or research documents can be effectively avoided, and ion fragments are reduced; a radial electric field is generated by utilizing the principle of charge accumulation balance on the insulating surface to block the radial diffusion of ions; the invalid volume is reduced, the air flow speed of the sample in the insulating pipeline is increased when the pumping speed is not changed, the ion motion is promoted in the axis direction, and the ion transmission efficiency is improved.
Description
Technical Field
The invention relates to the field of mass spectra, and particularly provides a photoionization source device for enhancing ion transmission by utilizing charge saturation. The principle is that the electric field generated after charges are accumulated on the insulating surface is utilized to restrain the movement of ions, so that the radial divergence of the ions is reduced, and the transmission efficiency of the ions in an ionization source is improved.
Background
In mass spectrometry photoionization sources, the sample is diffused in an effective cavity outside the electrode ring into the ionization chamber by "flooding" the sample through a capillary. The common structure of the photoionization source is formed by coaxially and uniformly stacking electrode rings at intervals, such as ionization sources related to patents CN200910248924.2, CN201010567193.0 and the like. In this configuration, on the one hand, the magnitude of the sample flow rate and the pump rate determine the magnitude of the gas pressure within the ionization source, but the number density decreases as the volume within the ionization chamber increases. According to the Lamborber's law, the ionic strength of the product is proportional to the number density of molecules. This means that the ionization volume increases leading to a decrease in mass spectral sensitivity. On the other hand, the volume of light beam irradiation in the photoionization source is not large, and sample molecules other than the light irradiation cannot be utilized. Thus reducing the ionization source volume helps to improve sensitivity and sample molecule utilization.
Aiming at the problem, the invention provides an ionization channel and a sample gas conveying pipeline which adopt a hollow insulating tube as a photoionization source, and the mode not only greatly reduces the invalid volume in the ionization source, but also has the following advantages: the insulating pipe wall can not generate photoelectrons when being irradiated by light, so that the photoelectron ionization effect in other patents or research documents can be effectively avoided, and ion fragments are reduced; a radial electric field is generated by utilizing the principle of charge accumulation balance on the insulating surface to block the radial diffusion of ions; the invalid volume is reduced, the air flow speed of the sample in the insulating pipeline is increased when the pumping speed is not changed, the ion motion is promoted in the axis direction, and the ion transmission efficiency is improved.
Disclosure of Invention
The invention provides a photoionization power supply device for enhancing ion transmission by utilizing charge saturation. The principle is that on the basis of reducing the volume of the ionization source, the electric field generated after charges are accumulated on the insulating surface is utilized to restrain the movement of ions, so that the radial divergence of the ions is reduced, and the transmission efficiency of the ions in the ionization source is improved.
In order to achieve the purpose, the invention adopts the technical scheme that:
a photoionization source device for enhancing ion transmission by utilizing charge saturation comprises a light source for ionization, an ionization cavity, a sample inlet tube, a transmission electrode group, an air pump, a hole electrode and an insulating tube;
the method is characterized in that: the ionization cavity is a closed cavity, and coaxial through holes are formed in the wall surfaces of the upper end and the lower end of the ionization cavity;
an insulating tube with openings at the upper end and the lower end is arranged in the ionization cavity, an annular transmission electrode group is sleeved on the outer wall surface of the insulating tube, a hole electrode is arranged below the insulating tube, and the peripheral edge of the hole electrode is hermetically connected with the peripheral edge of the through hole of the lower wall surface;
a light source is arranged above the ionization cavity, a light outlet of the light source faces the through hole on the upper wall surface, and light emitted by the light source enters the ionization cavity from the through hole on the upper wall surface and irradiates the hole electrode through the inside of the insulating tube;
the hole electrode is a plate-shaped metal electrode with a through hole in the center; the transmission electrode group is composed of two or more than three flat electrodes with circular through holes in the centers, the flat electrodes are parallel to each other, the through holes are coaxial and are arranged in sequence from top to bottom at equal intervals; the insulating tube is made of a hollow round tubular insulating material, is arranged inside the central through hole of the transmission electrode group and is coaxial with the central through hole of the transmission electrode group; one end of the insulating tube close to the light source is hermetically connected with the inner wall surface of the ionization chamber; the sample inlet pipe penetrates through the side wall of the ionization cavity and the side wall of the insulating pipe and extends into the insulating pipe; the outlet of the sample inlet pipe is arranged on the side wall surface of the insulating pipe between the upper wall surface through hole and the transmission electrode group.
And the adjacent flat electrodes in the transmission electrode group are connected in series through resistors, and the head piece and the tail piece of the transmission electrode group are respectively applied with direct-current voltage.
The upper wall surface through hole, the insulating tube, the hole electrode center through hole and the lower wall surface through hole are coaxial; a gap is reserved between the lower opening end of the insulating tube and the hole electrode.
An air pumping port connected with an air pumping pump is arranged on the side wall of the ionization cavity.
Ions generated by photoionization are repelled by accumulated charges on the wall of the insulating pipe, so that radial divergence is reduced; the sample gas flow molecules are carried in the axial direction of the insulating tube and accelerated by the electric field of the transmission electrode group; the inner diameter of the insulating tube, the pumping speed of the air pump and the field intensity of the transmission electrode group are reasonably arranged, and the transmission efficiency of the ionization source is improved.
The light source may be a discharge lamp or a laser emitting ultraviolet light.
The air pump is arranged between the transmission electrode group and the hole electrode, and the air flow speed in the insulating pipe is adjusted by controlling the pumping speed.
Drawings
FIG. 1 is a schematic diagram of an ionization source apparatus for improving ion transport efficiency by charge saturation according to the present invention.
Detailed Description
Fig. 1 is a schematic structural diagram of the present invention. The ionization type sample preparation device comprises a light source 1 for ionization, an ionization cavity 2, a sample inlet tube 3, a transmission electrode group 4, an air pump 5, a hole electrode 6 and an insulating tube 7;
the method is characterized in that: the ionization cavity 2 is a closed cavity, and coaxial through holes are formed in the wall surfaces of the upper end and the lower end of the ionization cavity;
an insulating tube 7 with openings at the upper end and the lower end is arranged in the ionization cavity 4, an annular transmission electrode group 4 is sleeved on the outer wall surface of the insulating tube 7, a hole electrode 6 is arranged below the insulating tube 7, and the peripheral edge of the hole electrode 6 is hermetically connected with the peripheral edge of the through hole of the lower wall surface;
a light source 1 is arranged above the ionization cavity 2, a light outlet of the light source 1 faces the through hole on the upper wall surface, and light emitted by the light source (1) enters the ionization cavity 2 from the through hole on the upper wall surface and irradiates on the hole electrode 6 through the inside of the insulating tube 7;
the hole electrode 6 is a plate-shaped metal electrode with a through hole in the center; the transmission electrode group 4 is composed of two or more than three flat electrodes with circular through holes in the centers, the flat electrodes are parallel to each other, the through holes are coaxial, and the flat electrodes are sequentially arranged from top to bottom at equal intervals; the insulating tube 7 is made of a hollow round tubular insulating material, is arranged in the central through hole of the transmission electrode group 4 and is coaxial with the central through hole of the transmission electrode group 4; one end of the insulating tube 7 close to the light source 1 is hermetically connected with the inner wall surface of the ionization cavity 2; the sample inlet pipe 3 penetrates through the side wall of the ionization cavity 2 and the side wall of the insulating pipe 7 and extends into the insulating pipe 7; the outlet of the sample inlet pipe 3 is arranged on the side wall surface of the insulating pipe 7 between the through hole on the upper wall surface and the transmission electrode group 4;
adjacent flat electrodes in the transmission electrode group 4 are connected in series through resistors, and direct-current voltage is respectively applied to the head piece and the tail piece of the transmission electrode group 4;
the upper wall surface through hole, the insulating tube 7, the hole electrode 6 central through hole and the lower wall surface through hole are coaxial; a gap is reserved between the lower opening end of the insulating tube 7 and the hole electrode 6;
an air pumping port connected with an air pump is arranged on the side wall of the ionization cavity 4.
Ions generated by photoionization are repelled by accumulated charges on the wall of the insulating tube 7, so that radial divergence is reduced; the sample gas flow molecules are carried in the axial direction of the insulating tube 7 and accelerated by the electric field of the transmission electrode group 4; the reasonable setting of the inner diameter of the insulating tube 7, the pumping speed of the air pump 5 and the field intensity of the transmission electrode group 4 is beneficial to improving the transmission efficiency of the ionization source.
The light source 1 may be a discharge lamp or a laser emitting ultraviolet light.
The air pump 5 is arranged between the transmission electrode group 4 and the hole electrode 6, and the air flow speed in the insulating pipe 7 is adjusted by controlling the pumping speed.
Claims (3)
1. A photoionization power supply device for enhancing ion transmission by utilizing charge saturation comprises a light source (1) for ionization, an ionization cavity (2), a sample inlet tube (3), a transmission electrode group (4), an air pump (5), a hole electrode (6) and an insulating tube (7);
the method is characterized in that: the ionization cavity (2) is a closed cavity, and the wall surfaces of the upper end and the lower end are provided with coaxial through holes;
an insulating tube (7) with openings at the upper end and the lower end is arranged in the ionization cavity (2), an annular transmission electrode group (4) is sleeved on the outer wall surface of the insulating tube (7), a hole electrode (6) is arranged below the insulating tube (7), and the peripheral edge of the hole electrode (6) is hermetically connected with the peripheral edge of the lower wall surface through hole;
a light source (1) is arranged above the ionization cavity (2), a light outlet of the light source (1) faces the through hole on the upper wall surface, and light emitted by the light source (1) enters the ionization cavity (2) from the through hole on the upper wall surface and irradiates the hole electrode (6) through the inside of the insulating tube (7);
the hole electrode (6) is a plate-shaped metal electrode with a through hole in the center; the transmission electrode group (4) is composed of two or more than three flat electrodes with circular through holes in the centers, the flat electrodes are parallel to each other, the through holes are coaxial, and the flat electrodes are sequentially arranged from top to bottom at equal intervals; the insulating tube (7) is made of a hollow round tubular insulating material, is arranged in the central through hole of the transmission electrode group (4) and is coaxial with the central through hole of the transmission electrode group (4); one end of the insulating tube (7) close to the light source (1) is hermetically connected with the inner wall surface of the ionization cavity (2); the sample inlet pipe (3) penetrates through the side wall of the ionization cavity (2) and the side wall of the insulating pipe (7) and extends into the insulating pipe (7); the outlet of the sample inlet pipe (3) is arranged on the side wall surface of the insulating pipe (7) between the through hole on the upper wall surface and the transmission electrode group (4);
adjacent flat electrodes in the transmission electrode group (4) are connected in series through resistors, and direct-current voltage is respectively applied to the head piece and the tail piece of the transmission electrode group (4);
the upper wall surface through hole, the insulating tube (7), the hole electrode (6) central through hole and the lower wall surface through hole are coaxial; a gap is reserved between the lower opening end of the insulating tube (7) and the hole electrode (6);
an air pumping port connected with an air pumping pump is arranged on the side wall of the ionization cavity (2);
ions generated by photoionization are repelled by accumulated charges on the wall of the insulating tube (7), so that radial divergence is reduced; the sample gas flow molecules are carried in the axial direction of the insulating tube (7) and accelerated by the electric field of the transmission electrode group (4); the internal diameter of the insulating tube (7), the pumping speed of the air pump (5) and the field intensity of the transmission electrode group (4) are reasonably set, and the transmission efficiency of the ionization source is improved.
2. The photoionization source device of claim 1, wherein:
the light source (1) is a discharge lamp or a laser emitting ultraviolet light.
3. The photoionization source device of claim 1, wherein:
the air pump (5) is arranged between the transmission electrode group (4) and the hole electrode (6), and the air flow speed in the insulating pipe (7) is adjusted by controlling the pumping speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811411830.8A CN111223748B (en) | 2018-11-25 | 2018-11-25 | Photo-ionization source device for enhancing ion transmission by utilizing charge saturation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811411830.8A CN111223748B (en) | 2018-11-25 | 2018-11-25 | Photo-ionization source device for enhancing ion transmission by utilizing charge saturation |
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| CN111223748B true CN111223748B (en) | 2020-12-01 |
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| CN113808909B (en) * | 2021-08-27 | 2022-05-17 | 中国科学院大连化学物理研究所 | Photoelectron inhibition ionization source device |
| CN113808908B (en) * | 2021-08-27 | 2022-06-14 | 中国科学院大连化学物理研究所 | Photoelectron-inhibiting ionization source device |
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| JP2004311135A (en) * | 2003-04-04 | 2004-11-04 | Japan Atom Energy Res Inst | Negative ion source using carbon nanotube |
| CN102522307B (en) * | 2012-01-06 | 2015-01-07 | 昆山禾信质谱技术有限公司 | Radio-frequency discharge ionization device enhanced by using photoelectric effect |
| 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 |
| CN104658849B (en) * | 2013-11-21 | 2017-02-08 | 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 |
| CN206163457U (en) * | 2016-11-17 | 2017-05-10 | 中国科学院大连化学物理研究所 | Aquatic VOCs automatic on -line continuous monitor's membrane sampling device |
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