CN108376637B - Ion velocity imager for realizing resolution of dissociated fragments in free flight area - Google Patents
Ion velocity imager for realizing resolution of dissociated fragments in free flight area Download PDFInfo
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- CN108376637B CN108376637B CN201810351633.5A CN201810351633A CN108376637B CN 108376637 B CN108376637 B CN 108376637B CN 201810351633 A CN201810351633 A CN 201810351633A CN 108376637 B CN108376637 B CN 108376637B
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Abstract
The invention discloses an ion velocity imager for resolving dissociation fragments in a free flight area, wherein a guide pipe is horizontally arranged at one end of a shell, a pulse valve is fixed at one end of the guide pipe in the shell, a first charged electrode plate, a second charged electrode plate, a third charged electrode plate, a fourth charged electrode plate, a fifth charged electrode plate and a sixth charged electrode plate are all charged electrode plates with central holes, the first charged electrode plate, the second charged electrode plate and the third charged electrode plate are sequentially and vertically arranged to form an imaging lens, the fourth charged electrode plate, the fifth charged electrode plate and the sixth charged electrode plate are sequentially and vertically arranged to form a damping field lens, a first flight tube and a second flight tube are horizontally arranged and fixed in the shell, the imaging lens is arranged at one end of the first flight tube, the damping field lens is arranged between the first flight tube and the second flight tube, and a detector is fixed at the other end of the shell and is positioned at one end of the second flight tube. The invention relates to an ion velocity imager capable of carrying out resolution detection on dissociated fragments in a free flight zone, which realizes resolution detection on the generated fragment ions generated by secondary dissociation in the free flight zone.
Description
Technical Field
The invention relates to an ion velocity imager, in particular to an ion velocity imager for distinguishing dissociated fragments in a free flight area.
Background
Currently, current ion velocity imagers are designed by the netherlands scientists Eppink and Parker in 1997 [1,2], which form ion lenses by designing three polar plates with round holes under a certain optimized voltage configuration to realize focusing of charged particles with the same velocity but different positions, and then collect the charged particles by a Micro-channel Plate & ph pump Screen (Micro-channel Plate & phosphor Screen) detector at the rear end of a flight tube, as shown in fig. 4 (a), wherein P1 is a repulsive-stage polar Plate, P2 is an accelerating-stage polar Plate, and P3 is a grounding-stage polar Plate. Charged particles at different positions are focused on one point of the detector under the action of the ion lens, which greatly improves the resolution of ion velocity imaging. After applying a suitable voltage to the blank disk, an ion lens is formed, as shown in fig. 4 (b).
However, current ion velocity imagers based on tripolar plate designs, as well as later developed multipole plate ion velocity imagers, do not allow for resolution of dissociated fragments in the free flight zone (P3 to detector). In the case of the atmospheric contaminant xylene, the chemical formula of the xylene is C6H5 (CH 3) 2, and after the xylene absorbs photons, ionization and dissociation occur, and one methyl CH3 is broken to generate C6H5CH3 + Ion collection of C6H5CH3 by prior art + The ion velocity image of the ions can obtain C6H5CH3 + The kinetic energy distribution and the angular distribution of the ions can be recognized by analysis, and then there is enough evidence to indicate [3 ]]，C6H5CH3 + The ion can generate chemical bond fracture again in part in the flying process of the free flying area, and fracture the second methyl CH3 to generate C6H5 + Ion, C6H5 at this time + Ion and C6H5CH3 without secondary fragmentation + Ions having the same velocity, since the free flight zone is field-free and cannot be distinguished, they will arrive at the detector at the same time and be imaged, misinterpreted as pure C6H5CH3 + Ions are imaged and analyzed, resulting in erroneous experimental measurements. This phenomenon is very common in the field of ion velocity imaging and has not been addressed so far.
Colloquially, the expression is as follows: the compound ABC absorbs photons and then generates chemical bond rupture to generate AB + Ion, AB + Ions are imaged in an ion velocity imager fly through a free flight zone to a detector, however AB + The ions may break chemical bonds in the free flight zone to form A + Ions or B + The ions, in this case, however, the free flight zone does not have an electric field distribution, although AB + Ion, A + Ion, B + Ions the three ions are of different mass but cannot be distinguished, and will be separated by the same time (AB + Ion arrival time) to the detector, causing interference with the experiment, ion velocity imagers based on prior art have failed to address this problem.
Reference is made to: [1] A.T.J.B. Eppink, D.H. Parker, rev. Sci. Instrom. 68, 3477 (1997)
[2] A. T. J. B. Eppink, D. H. Parker, J. Chem. Phy. 110, 832 (1999)
[3] Y. Liu, T. Gerber, C. Qin, F. Jin, G. Knopp, J. Chem. Phy. 144, 084201 (2016)
[4] D. A. Dahl, J. E. Delmore, and A. D. Appelhans, Rev. Sci. Instrum. 61, 607 (1990)。
Disclosure of Invention
The invention aims to provide an ion velocity imager for resolving dissociated fragments in a free flight area.
In order to solve the technical problems, the invention adopts the following technical scheme:
an ion velocity imager for resolving dissociated fragments in a free flight zone, comprising: the device comprises a shell, a guide pipe, a pulse valve, a laser beam, a first charged plate electrode, a second charged plate electrode, a third charged plate electrode, a fourth charged plate electrode, a fifth charged plate electrode, a sixth charged plate electrode, a detector, a first flight tube and a second flight tube, wherein the guide pipe is horizontally arranged at one end of the shell, one end of the guide pipe penetrates through the end of the shell and is arranged inside the shell, the pulse valve is fixed at one end of the guide pipe, which is positioned in the shell, of the first charged plate electrode, the second charged plate electrode, the third charged plate electrode, the fourth charged plate electrode, the fifth charged plate electrode and the sixth charged plate electrode are all charged plates with central holes, the first charged plate electrode, the second charged plate electrode and the third charged plate electrode are sequentially vertically arranged to form an imaging lens, the fourth charged plate electrode, the fifth charged plate electrode and the sixth charged plate electrode are sequentially vertically arranged to form a damping field lens, the first flight tube and the second flight tube are horizontally arranged at one end of the first flight tube, the damping field lens is arranged between the first flight tube and the second flight tube, and the detector is fixed at the other end of the shell, and is positioned at one end of the second flight tube.
Further, the thicknesses of the first charged electrode plate, the second charged electrode plate and the third charged electrode plate are 2mm, the outer diameters of the first charged electrode plate, the second charged electrode plate and the third charged electrode plate are 140mm, the inner diameters of the first charged electrode plate, the second charged electrode plate and the third charged electrode plate are 20mm, 30mm and 30mm respectively, and the distances among the first charged electrode plate, the second charged electrode plate and the third charged electrode plate are 38mm.
Further, the thicknesses of the fourth charged electrode plate, the fifth charged electrode plate and the sixth charged electrode plate are 2mm, the outer diameters of the fourth charged electrode plate, the fifth charged electrode plate and the sixth charged electrode plate are 140mm, the inner diameters of the fourth charged electrode plate, the fifth charged electrode plate and the sixth charged electrode plate are 70mm, and the distances among the fourth charged electrode plate, the fifth charged electrode plate and the sixth charged electrode plate are 20mm.
Further, the first flying tube and the second flying tube are mu metal round tubes, the lengths of the first flying tube and the second flying tube are 620 mm mm and 120mm respectively, the inner diameter of the first flying tube and the second flying tube is 140mm, the outer diameter of the first flying tube and the second flying tube is 144mm, and the thickness of the first flying tube and the second flying tube is 2mm.
Further, the voltages of the first charged plate, the second charged plate and the third charged plate are 3000V, 1990V and grounded respectively.
Further, the voltages of the fourth charged electrode plate, the fifth charged electrode plate and the sixth charged electrode plate are respectively grounded, 300V and 600V.
Further, the second flight tube voltage is 600V.
Further, the detector comprises a first micro-channel plate, a second micro-channel plate and a phosphor screen, and a CCD camera is arranged at the rear side for imaging.
Further, the voltages of the first microchannel plate, the second microchannel plate and the phosphor screen are 600V, 2100V and 5600V respectively.
Compared with the prior art, the invention has the following advantages and effects: the ion velocity imager for resolving the dissociated fragments in the free flight area can resolve and detect the fragment ions generated by secondary dissociation in the free flight area, eliminate experimental interference factors and improve the accuracy of imaging experimental measurement.
Drawings
Fig. 1 is a schematic diagram of an ion velocity imager embodying the present invention to resolve dissociated fragments of a free flight region.
Fig. 2 is a schematic diagram of a detector of the present invention.
Fig. 3 is a schematic diagram of the electric field distribution of an ion velocity imager embodying the present invention to resolve dissociated fragments in the free flight region.
Fig. 4 is a schematic diagram of an ion velocity imager based on a three plate design of the prior art.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and not limited to the following examples.
As shown in fig. 1, the ion velocity imager for realizing resolution of dissociated fragments in a free flight area comprises a shell, a guide tube G1, a pulse valve V1, a laser beam L1, a first charged plate P1, a second charged plate P2, a third charged plate P3, a fourth charged plate R1, a fifth charged plate R2, a sixth charged plate R3, a detector D1, a first flight tube T1 and a second flight tube T2, wherein the guide tube G1 is horizontally arranged at one end of the shell, one end of the guide tube G1 penetrates through the end of the shell, the pulse valve V1 is fixed at one end of the guide tube G1 in the shell, the first charged plate P1, the second charged plate P2, the third charged plate P3, the fourth charged plate R1, the fifth charged plate R2 and the sixth charged plate R3 are charged plates with central openings, the first charged plate P1, the second charged plate P2 and the third charged plate P3 are sequentially vertically arranged to form an imaging lens, the fourth charged plate R1, the fifth flight plate R2 and the sixth charged plate R3 are sequentially vertically arranged at one end of the guide tube G1 and pass through the end of the shell, the pulse valve V1 is fixed at one end of the guide tube G1 in the shell, the first end is fixedly arranged at the other end of the first end of the guide tube T1, and the first end is fixedly arranged at the other end of the first end of the guide tube T2 is a damping tube T1. The meteorological sample is led in the guide pipe G1, is sprayed into the vacuum cavity of the imager by the pulse valve V1, generates photochemical reaction with the laser beam L1 to generate parent ions and fragment ions, and flies through the free flight area T1 to be focused on the detector D1 under the action of a focusing electric field formed by the imaging lenses (P1, P2 and P3), wherein the detector D1 consists of two micro-channel plates MCP and a phosphor screen, and a CCD camera is arranged at the back for imaging. However, if the fragment ions are dissociated again in the free flight area T1, the damping field lenses (R1, R2, R3) play a role in resolving, and by setting the damping field lenses, the resolution of the fragments generated by the secondary dissociation in the free flight area T1 is realized under the condition of keeping the original focusing imaging effect unchanged, because the mass numbers of the fragment ions generated by the secondary dissociation are different from that of the original ion fragments, and the damping field lenses can enable the fragment ions with different masses to reach the detector D1 with different flight times, so that the resolution detection is realized.
The thickness of the first charged electrode plate P1, the second charged electrode plate P2 and the third charged electrode plate P3 is 2mm, the outer diameter is 140mm, the inner diameters of the first charged electrode plate P1, the second charged electrode plate P2 and the third charged electrode plate P3 are 20mm, 30mm and 30mm respectively, and the distance between the first charged electrode plate P1, the second charged electrode plate P2 and the third charged electrode plate P3 is 38mm. The thickness of the fourth charged electrode plate R1, the fifth charged electrode plate R2 and the sixth charged electrode plate R3 is 2mm, the outer diameter is 140mm, the inner diameters of the fourth charged electrode plate R1, the fifth charged electrode plate R2 and the sixth charged electrode plate R3 are 70mm, and the distance between the fourth charged electrode plate R1, the fifth charged electrode plate R2 and the sixth charged electrode plate R3 is 20mm. The first flight tube T1 and the second flight tube T2 are mu metal round tubes, the lengths of the mu metal round tubes are 620 mm and 120mm respectively, the inner diameter of the mu metal round tube is 140mm, the outer diameter of the mu metal round tube is 144mm, and the thickness of the mu metal round tube is 2mm.
The voltages of the first charged plate P1, the second charged plate P2 and the third charged plate P3 are 3000V, 1990V and grounded, respectively. The voltages of the fourth charged plate R1, the fifth charged plate R2 and the sixth charged plate R3 are respectively ground, 300V and 600V. The second flight tube T2 voltage is 600V. As shown in fig. 2, the detector D1 includes a first microchannel plate MCP1, a second microchannel plate MCP2, and a phosphor screen PS, and a CCD camera is provided on the rear side for imaging. The voltages of the first microchannel plate, the second microchannel plate and the phosphor screen are 600V, 2100V and 5600V, respectively.
The ion velocity imager of the present invention has no voltage as shown in fig. 3 (a), and the electric potential energy distribution corresponding to the whole novel device is shown in fig. 3 (b) under the condition that the damping field is not started under the above voltage setting. To analyze the feasibility of the method, the method is simulated by adopting international general SIMION software, and the simulated C6H5CH3 is simulated by assuming that C6H5CH3+ ions are dissociated in the flight tube T1 in the experimental process + The ion is broken to generate C6H5 after flying into the flight tube T1 for 118mm + Ion, C6H5CH3 + Ions and C6H5 + The mass numbers of the ions were 90amu and 77amu, respectively, and they were found by simulation to arrive at the detector at the same time, 15.70 microseconds, without the damping field being activated, as in fig. 3 (c), and could not be distinguished. And after the damping field is activated, as shown in FIG. 3 (d), the electric field distribution is reconstructed, C6H5CH3 + Ions and C6H5 + The ion arrival times at the detector were 18.99 microseconds and 17.93 microseconds, respectively, as can be well distinguished in fig. 3 (e).
The ion velocity imager for resolving the dissociated fragments in the free flight area can resolve and detect the fragment ions generated by secondary dissociation in the free flight area, eliminate experimental interference factors and improve the accuracy of imaging experimental measurement.
The foregoing description of the invention is merely exemplary of the invention. Various modifications or additions to the described embodiments may be made by those skilled in the art to which the invention pertains or in a similar manner, without departing from the spirit of the invention or beyond the scope of the invention as defined in the appended claims.
Claims (7)
1. An ion velocity imager for resolving dissociated fragments in a free flight zone, comprising: the device comprises a shell, a conduit, a pulse valve, a laser beam, a first charged electrode plate, a second charged electrode plate, a third charged electrode plate, a fourth charged electrode plate, a fifth charged electrode plate, a sixth charged electrode plate, a detector, a first flight tube and a second flight tube, wherein the conduit is horizontally arranged at one end of the shell, one end of the conduit penetrates through the end of the shell and is arranged in the shell, the pulse valve is fixed at one end of the conduit in the shell, the first charged electrode plate, the second charged electrode plate, the third charged electrode plate, the fourth charged electrode plate, the fifth charged electrode plate and the sixth charged electrode plate are all charged electrode plates with central holes, the first charged electrode plate, the second charged electrode plate and the third charged electrode plate are sequentially and vertically arranged to form an imaging lens, the fourth charged electrode plate, the fifth charged electrode plate and the sixth charged electrode plate are sequentially and vertically arranged to form a damping field lens, the first flight tube and the second flight tube are horizontally arranged and are fixed in the shell, the imaging lens is arranged at one end of the first flight tube, the damping field lens is arranged between the first flight tube and the second flight tube, and the detector is fixed at the other end of the shell and is positioned at one end of the second flight tube; the voltages of the first charged electrode plate, the second charged electrode plate and the third charged electrode plate are 3000V, 1990V and grounded respectively; the voltages of the fourth charged electrode plate, the fifth charged electrode plate and the sixth charged electrode plate are respectively grounded, 300V and 600V.
2. An ion velocity imager for effecting resolution of dissociated fragments of a free flight zone as recited in claim 1, wherein: the thickness of the first charged electrode plate, the second charged electrode plate and the third charged electrode plate is 2mm, the outer diameter of the first charged electrode plate, the second charged electrode plate and the third charged electrode plate are 140mm, the inner diameters of the first charged electrode plate, the second charged electrode plate and the third charged electrode plate are 20mm, 30mm and 30mm respectively, and the distance between the first charged electrode plate, the second charged electrode plate and the third charged electrode plate is 38mm.
3. An ion velocity imager for effecting resolution of dissociated fragments of a free flight zone as recited in claim 1, wherein: the thicknesses of the fourth charged electrode plate, the fifth charged electrode plate and the sixth charged electrode plate are 2mm, the outer diameters of the fourth charged electrode plate, the fifth charged electrode plate and the sixth charged electrode plate are 140mm, the inner diameters of the fourth charged electrode plate, the fifth charged electrode plate and the sixth charged electrode plate are 70mm, and the distances among the fourth charged electrode plate, the fifth charged electrode plate and the sixth charged electrode plate are 20mm.
4. An ion velocity imager for effecting resolution of dissociated fragments of a free flight zone as recited in claim 1, wherein: the first flying tube and the second flying tube are mu metal round tubes, the lengths of the first flying tube and the second flying tube are 620 mm mm and 120mm respectively, the inner diameter of the first flying tube and the second flying tube is 140mm, the outer diameter of the first flying tube and the second flying tube is 144mm, and the thickness of the first flying tube and the second flying tube is 2mm.
5. An ion velocity imager for effecting resolution of dissociated fragments of a free flight zone as recited in claim 1, wherein: the second flight tube voltage is 600V.
6. An ion velocity imager for effecting resolution of dissociated fragments of a free flight zone as recited in claim 1, wherein: the detector comprises a first micro-channel plate, a second micro-channel plate and a phosphor screen, and a CCD camera is arranged at the rear side for imaging.
7. An ion velocity imager for effecting resolution of dissociated fragments of a free flight zone as recited in claim 6, wherein: the voltages of the first micro-channel plate, the second micro-channel plate and the phosphor screen are 600V, 2100V and 5600V respectively.
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| US5233189A (en) * | 1991-03-04 | 1993-08-03 | Hermann Wollnik | Time-of-flight mass spectrometer as the second stage for a tandem mass spectrometer |
| WO1995033279A1 (en) * | 1994-05-31 | 1995-12-07 | University Of Warwick | Tandem mass spectrometry apparatus |
| US6512226B1 (en) * | 1997-12-04 | 2003-01-28 | University Of Manitoba | Method of and apparatus for selective collision-induced dissociation of ions in a quadrupole ion guide |
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| CN102778498A (en) * | 2012-07-11 | 2012-11-14 | 复旦大学 | High-resolution ion selectivity photolysis device and method for mass spectrum and spectral analysis |
| CN106057631A (en) * | 2016-07-22 | 2016-10-26 | 南京信息工程大学 | Image size tunable light photoelectron imager |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4513488B2 (en) * | 2004-10-06 | 2010-07-28 | 株式会社日立製作所 | Ion mobility analyzer and ion mobility analysis method |
| JP5341323B2 (en) * | 2007-07-17 | 2013-11-13 | 株式会社日立ハイテクノロジーズ | Mass spectrometer |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5233189A (en) * | 1991-03-04 | 1993-08-03 | Hermann Wollnik | Time-of-flight mass spectrometer as the second stage for a tandem mass spectrometer |
| WO1995033279A1 (en) * | 1994-05-31 | 1995-12-07 | University Of Warwick | Tandem mass spectrometry apparatus |
| US6512226B1 (en) * | 1997-12-04 | 2003-01-28 | University Of Manitoba | Method of and apparatus for selective collision-induced dissociation of ions in a quadrupole ion guide |
| US6534764B1 (en) * | 1999-06-11 | 2003-03-18 | Perseptive Biosystems | Tandem time-of-flight mass spectrometer with damping in collision cell and method for use |
| WO2007077245A1 (en) * | 2006-01-03 | 2007-07-12 | Physikron | A method and apparatus for tandem time-of-flight mass spectrometry without primary mass selection |
| CN102778498A (en) * | 2012-07-11 | 2012-11-14 | 复旦大学 | High-resolution ion selectivity photolysis device and method for mass spectrum and spectral analysis |
| CN106057631A (en) * | 2016-07-22 | 2016-10-26 | 南京信息工程大学 | Image size tunable light photoelectron imager |
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