CN113053721A - Small-size time of flight mass spectrometer - Google Patents
Small-size time of flight mass spectrometer Download PDFInfo
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- CN113053721A CN113053721A CN201911373193.4A CN201911373193A CN113053721A CN 113053721 A CN113053721 A CN 113053721A CN 201911373193 A CN201911373193 A CN 201911373193A CN 113053721 A CN113053721 A CN 113053721A
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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
- H01J49/34—Dynamic spectrometers
- H01J49/40—Time-of-flight spectrometers
- H01J49/405—Time-of-flight spectrometers characterised by the reflectron, e.g. curved field, electrode shapes
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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
- H01J49/025—Detectors specially adapted to particle spectrometers
Abstract
The invention discloses a small-sized flight time mass spectrometer. The invention comprises a vacuum cavity, an ion source, an ion transmission system, an acceleration area, a field-free flight area, a reflection area and an ion detector; the accelerating area and the reflecting area are respectively positioned on two sides of the field-free flight area; the electric field of the field-free flight area is 0, and the direction of the electric field of the reflection area is opposite to that of the electric field of the acceleration area; the ion detector and the accelerating region are positioned on the same side of the field-free flight region. The invention adopts a vertical introduction reflection type structure, greatly reduces the space dispersion and energy dispersion of ions, improves the resolution of the instrument, and simultaneously does not adopt a quadrupole rod structure to modulate the ions in the transmission process, thereby greatly reducing the mass, the volume and the power consumption of the mass spectrometer.
Description
Technical Field
The invention relates to the technical field of vacuum measurement and instruments and meters, in particular to a small-sized flight time mass spectrometer.
Background
Since the invention of the time-of-flight mass spectrometer, people carry out deep and extensive research on the time-of-flight mass spectrometer, compared with other types of mass spectrometers such as magnetic deflection, quadrupole rods and ion traps, the time-of-flight mass spectrometer has the advantages of high analysis speed and no mass upper limit theoretically, and is widely applied to the fields of environmental monitoring, food safety, judicial departments, aerospace and the like.
The time-of-flight mass spectrometer mainly comprises an ion source, a time-of-flight mass analyzer, an ion detector and an electronics part. The existing time-of-flight mass spectrometer has the common defects of high power consumption, large volume and heavy mass, so that the existing time-of-flight mass spectrometer is not suitable for portable gas component detection and space environment detection.
Disclosure of Invention
In view of this, the invention provides a small time-of-flight mass spectrometer, which has low power consumption, small volume and light weight, and reduces the spatial dispersion and energy dispersion of ions and improves the performance of the instrument by vertically introducing a reflective structure.
The invention relates to a small-sized flight time mass spectrometer, which comprises a vacuum cavity, an ion source, an ion transmission system, an acceleration area, a field-free flight area, a reflection area and an ion detector, wherein the ion source, the ion transmission system, the acceleration area, the field-free flight area, the reflection area and the ion detector are arranged in the vacuum cavity; the accelerating area and the reflecting area are respectively positioned on two sides of the field-free flight area; the electric field of the field-free flight area is 0, and the direction of the electric field of the acceleration area and the speed direction of the ions entering the acceleration area form 90 degrees; the direction of the electric field of the reflecting area is opposite to that of the electric field of the accelerating area; the ion detector and the accelerating region are positioned on the same side of the field-free flight region.
Ions emitted by the ion source enter an acceleration region through an ion transmission system, enter a field-free flight region nearly vertically under the loading of the rotation of the acceleration region, and fly in the field-free flight region by means of inertia and enter a reflection region; because the direction of the electric field of the reflecting area is opposite to that of the electric field of the accelerating area, the ions enter the reflecting area, then are decelerated to 0 and then are turned, reversely fly back to the field-free flight area, penetrate out and are detected by the ion detector.
Has the advantages that:
the invention adopts the vertical introduction reflection type structure, thereby greatly reducing the space dispersion and energy dispersion of ions and improving the resolution of the instrument. Meanwhile, a quadrupole rod structure is not adopted to modulate ions in the transmission process, so that the mass, the volume and the power consumption of the mass spectrometer are greatly reduced.
Drawings
FIG. 1 is a schematic view of a compact time-of-flight mass spectrometer according to the present invention.
The device comprises a vacuum chamber 1, an ion source 2, an ion transmission system 3, an acceleration zone 4, a field-free flight zone 5, a reflection zone 6 and an ion detector 7.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The invention provides a small-sized time-of-flight mass spectrometer, which comprises a vacuum cavity 1, an ion source 2, an ion transmission system 3, an acceleration area 4, a field-free flight area 5, a reflection area 6 and an ion detector 7, as shown in figure 1. The ion source 2, the ion transmission system 3, the acceleration area 4, the field-free flight area 5, the reflection area 6 and the ion detector 7 are all arranged in the vacuum cavity 1, the ion transmission system 3 is respectively connected with the ion source 2 and the acceleration area 4, the field-free flight area 5 is connected with the acceleration area 4 and the reflection area 6, and the ion detector 7 is connected with the field-free flight area 5. Wherein, the accelerating area 4 and the reflecting area 6 are respectively positioned at two sides of the field-free flight area 5; the electric field of the field-free flight area 5 is 0, and the direction of the electric field of the acceleration area 4 and the speed direction of the ions entering the acceleration area 4 form 90 degrees; the direction of the electric field of the reflecting area 6 is opposite to that of the electric field of the accelerating area 4; the ion detector 7 is located on the same side of the field-free flight zone as the acceleration zone 4.
The ion source adopts an electron bombardment ion source and mainly comprises an ionization chamber, a filament, an extraction electrode and a focusing electrode. The accelerating region 4 is a double-field accelerating region. The reflecting area 6 is a secondary reflecting area.
The flight time mass analyzer of the small-sized flight time mass spectrometer is a reflection-type mass analyzer and consists of an acceleration region (4), a field-free flight region (5) and a reflection region (6) so as to record the flight time of ions to reflect the mass spectrum of the ions, and the ions with different mass-to-charge ratios are detected by utilizing the long flight time and the short flight time of the ions with large mass and small mass. The reflective structure can compensate the energy dispersion of ions, namely, ions with the same mass-to-charge ratio have larger energy, enter the reflecting area deeper than ions with smaller energy, stay in the reflecting area for longer time and finally reach the detector at the same time.
The ion detector of the small-sized flight time mass spectrometer adopts a double-layer micro-channel plate detector, and the detection range of ion current is enlarged.
The working principle of the invention is as follows: when a group of charged ions with different m/q (mass-to-charge ratios) pass through the same electrostatic field region (acceleration region), the same kinetic energy KE is obtained, as shown in formula (1), and then the charged ions enter a section of non-field region with the length L to fly freely by inertia, finally reach the same terminal point and are detected. Since the velocity of an ion is inversely proportional to the square root of its m/q (mass-to-charge ratio), ions with a large m/q fly slower than ions with a small m/q, and the time to the end point is longer. If an ion detector is arranged at the end point, the Time-of-flight (Time-of-flight) of the ions can be recorded, and the mass-to-charge ratio of the ions can be obtained through the calculation of the formula (2).
In the formula, U represents accelerating voltage, V represents accelerated ion speed, L represents flight length, the mass of certain ion is m, the charged quantity is q, and the flight time T can be obtained by simple calculation of electric field forcef. The acceleration voltage and the flight length of a common instrument are fixed and constant, and the formula (2) shows that the flight time of certain ions has a one-to-one correspondence relationship with the charge-to-mass ratio of the ions.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A small-sized flight time mass spectrometer is characterized by comprising a vacuum cavity (1), an ion source (2), an ion transmission system (3), an acceleration area (4), a field-free flight area (5), a reflection area (6) and an ion detector (7), wherein the ion source, the ion transmission system, the acceleration area, the field-free flight area, the reflection area and the ion detector are arranged in the vacuum cavity (1); wherein, the accelerating area (3) and the reflecting area (6) are respectively positioned at two sides of the field-free flight area (5); the electric field of the field-free flight area is 0; the direction of the electric field of the accelerating region (4) and the speed direction of the ions entering the accelerating region form 90 degrees; the direction of the electric field of the reflecting area (6) is opposite to that of the electric field of the accelerating area (4); the ion detector and the accelerating region are positioned on the same side of the field-free flight region.
2. The compact time-of-flight mass spectrometer of claim 1, wherein the ion source (2) is an electron bombardment ion source.
3. The compact time-of-flight mass spectrometer of claim 1, wherein the acceleration region (4) is a dual field acceleration region.
4. The compact time-of-flight mass spectrometer of claim 1, wherein the reflecting region (6) is a secondary reflecting region.
5. The compact time-of-flight mass spectrometer of claim 1, wherein the ion detector (7) is a microchannel plate ion detector.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911373193.4A CN113053721A (en) | 2019-12-27 | 2019-12-27 | Small-size time of flight mass spectrometer |
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| CN201911373193.4A CN113053721A (en) | 2019-12-27 | 2019-12-27 | Small-size time of flight mass spectrometer |
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| CN113053721A true CN113053721A (en) | 2021-06-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116822248A (en) * | 2023-08-23 | 2023-09-29 | 杭州谱育科技发展有限公司 | Parameter design method of flight time mass spectrum device |
Citations (5)
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| CN102800553A (en) * | 2012-09-02 | 2012-11-28 | 王利兵 | Gas/liquid chromatogram-electron bombardment electrospray dual-ion-source flight time mass spectrum system |
| CN103268851A (en) * | 2012-05-21 | 2013-08-28 | 核工业北京地质研究院 | Thermal ionization time-of-flight mass spectrometer and thermal ionization time-of-fight mass spectrometric analysis method |
| CN108054076A (en) * | 2017-12-18 | 2018-05-18 | 广州禾信仪器股份有限公司 | Selection ion screens out equipment and method |
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2019
- 2019-12-27 CN CN201911373193.4A patent/CN113053721A/en active Pending
Patent Citations (5)
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| GB0405299D0 (en) * | 2003-03-11 | 2004-04-21 | Micromass Ltd | Mass spectrometer |
| CN101789355A (en) * | 2010-03-18 | 2010-07-28 | 广州禾信分析仪器有限公司 | Time-of-flight mass spectrometer with wide dynamic range, implementation method and application thereof |
| CN103268851A (en) * | 2012-05-21 | 2013-08-28 | 核工业北京地质研究院 | Thermal ionization time-of-flight mass spectrometer and thermal ionization time-of-fight mass spectrometric analysis method |
| CN102800553A (en) * | 2012-09-02 | 2012-11-28 | 王利兵 | Gas/liquid chromatogram-electron bombardment electrospray dual-ion-source flight time mass spectrum system |
| CN108054076A (en) * | 2017-12-18 | 2018-05-18 | 广州禾信仪器股份有限公司 | Selection ion screens out equipment and method |
Non-Patent Citations (2)
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| 何坚等: "小型高分辨电子轰击离子源反射式飞行时间质谱仪的研制", 《仪器装置与实验技术》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116822248A (en) * | 2023-08-23 | 2023-09-29 | 杭州谱育科技发展有限公司 | Parameter design method of flight time mass spectrum device |
| CN116822248B (en) * | 2023-08-23 | 2023-11-17 | 杭州谱育科技发展有限公司 | Parameter design method of flight time mass spectrum device |
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