CN208062022U - Realize the Velocity map ion imaging instrument differentiated to free flight area dissociation fragment - Google Patents
Realize the Velocity map ion imaging instrument differentiated to free flight area dissociation fragment Download PDFInfo
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- CN208062022U CN208062022U CN201820556745.XU CN201820556745U CN208062022U CN 208062022 U CN208062022 U CN 208062022U CN 201820556745 U CN201820556745 U CN 201820556745U CN 208062022 U CN208062022 U CN 208062022U
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Abstract
The utility model discloses a kind of Velocity map ion imaging instrument realized and differentiated to free flight area dissociation fragment, conduit is horizontally set on shell one end end, pulse valve is fixed on one end that conduit is located in shell, first band electrode plate, second electrification pole plate, third electrification pole plate is vertically arranged composition imaging len successively, 4th electrification pole plate, 5th electrification pole plate, 6th electrification pole plate is vertically arranged composition damping field lens successively, first tof tube and the second tof tube are horizontally disposed and be fixed in shell, imaging len is arranged in first tof tube one end, field lens is damped to be arranged between the first tof tube and the second tof tube, detector is fixed on shell other end end and is located at second tof tube one end.The utility model is the Velocity map ion imaging instrument that fragment resolved detection can be dissociated to free flight area, realizes and secondary dissociation generation fragment ion progress resolved detection occurs to free flight area.
Description
Technical field
The utility model is related to a kind of Velocity map ion imaging instrument, especially a kind of to realize to free flight area dissociation fragment point
The Velocity map ion imaging instrument distinguished.
Background technology
Velocity map ion imaging instrument current at present be by Dutch scientist Eppink and Parker in design in 1997 [1,
2], they under certain optimization voltage configuration, form ion lens, realize to tool by designing three pieces of pole plates with circular hole
There is identical speed but the charged particle of different location is focused, then by tof tube rear end MCP&PS（Micro-channel
Plate & Phorsphor Screen, microchannel plate & phosphorescent screens）Detector is collected, and as shown in Fig. 4 (a), wherein P1 is row
It is accelerating stage pole plate to denounce grade pole plate, P2, and P3 is ground connection grade pole plate.Under ion lens effect, the charged particle of different location is poly-
Coke is on a point of detector, and which greatly enhances the resolution ratio of Velocity map ion imaging.Appropriate electrical will be added with empty disk
After pressure, ion lens is formed, as shown in Fig. 4 (b).
However, current at present the Velocity map ion imaging instrument designed based on tri-electrode and the multi-electrode ion developed later
Velocity imaging instrument all cannot achieve to free flight area（P3 is between detector）Dissociation fragment is differentiated.Here with air
For pollutant dimethylbenzene, dimethylbenzene chemical formula is C6H5 (CH3) 2, and ionization and dissociation occurs after dimethylbenzene absorbs photon, breaks
It splits a methyl CH3 and generates C6H5CH3+Ion acquires C6H5CH3 by the prior art+The ion velocity mapping of ion, you can
Obtain C6H5CH3+The kinetic energy distribution and angular distribution of ion, by analysis it will be recognized that its photochemistry mechanism, then has enough
Evidence shows [3], C6H5CH3+Chemical bond rupture occurs again for ion branch in the middle part of free flight area flight course, fracture the
Two methyl CH3 generate C6H5+Ion, and C6H5 at this time+Ion and the C6H5CH3 that secondary breakdown does not occur+Ion has
Identical speed cannot be distinguished since free flight area is field-free region, therefore their two kinds of ions will be arrived with the identical time
It is imaged up to detector, is mistaken for pure C6H5CH3+Ion is imaged and is analyzed, and the experiment of mistake is caused to measure.It is this
Phenomenon is very universal in Velocity map ion imaging field, is not solved so far.
It is expressed as follows for popular：After absorbing photon chemical bond rupture occurs for compound ABC, generates AB+Ion, AB+From
Son flies through free flight area arrival detector in Velocity map ion imaging instrument and is imaged, however AB+Ion has in free flight area can
The fracture of chemical bond can occur, generate A+Ion or B+Ion, and at this time the case where be free flight area do not have field distribution,
Although AB+Ion, A+Ion, B+The quality of three kinds of ions of ion is different, but cannot be distinguished, and three kinds of ions will be with identical
Time（AB+The arrival time of ion）It is detected to reach detector, causes the interference to experiment, the ion speed based on the prior art
Degree imager has no way of solving to this problem.
Bibliography：[1] A. T. J. B. Eppink, D. H. Parker, Rev. Sci. Instrum. 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)。
Utility model content
It is realized to free flight area dissociation fragment resolution the technical problem to be solved by the utility model is to provide a kind of
Velocity map ion imaging instrument.
In order to solve the above technical problems, technical solution used by the utility model is：
It is a kind of to realize the Velocity map ion imaging instrument differentiated to free flight area dissociation fragment, it is characterised in that：Including shell,
Conduit, pulse valve, laser beam, first band electrode plate, the second electrification pole plate, third electrification pole plate, the 4th electrification pole plate, the 5th band
Electrode plate, the 6th electrification pole plate, detector, the first tof tube and the second tof tube, conduit are horizontally set on shell one end end
And tube at one end passes through shell end to be arranged inside housings, and pulse valve is fixed on one end that conduit is located in shell, and first
It is equal to charge pole plate, the second electrification pole plate, third electrification pole plate, the 4th electrification pole plate, the 5th electrification pole plate and the 6th electrification pole plate
Centered on trepanning electrification pole plate, first band electrode plate, second electrification pole plate, third electrification pole plate be vertically arranged successively composition at
As lens, the 4th electrification pole plate, the 5th electrification pole plate, the 6th electrification pole plate are vertically arranged successively constitutes damping field lens, and first
Tof tube and the second tof tube are horizontally disposed and be fixed in shell, imaging len setting in first tof tube one end,
It damps field lens to be arranged between the first tof tube and the second tof tube, detector is fixed on shell other end end and positioned at the
Two tof tube one end.
Further, the thickness of the first band electrode plate, the second electrification pole plate and third electrification pole plate is 2mm, outer diameter
It is 140mm, the internal diameter of first band electrode plate, the second electrification pole plate and third electrification pole plate is respectively 20mm, 30mm, 30mm,
The distance between first band electrode plate, the second electrification pole plate and third electrification pole plate are 38mm.
Further, the 4th electrification pole plate, the 5th electrification pole plate and the 6th electrification electrode thickness are 2mm, and outer diameter is equal
For 140mm, the 4th electrification pole plate, the 5th electrification pole plate and the 6th electrification pole plate internal diameter are 70mm, the 4th electrification pole plate, the 5th
It is 20mm to charge the distance between pole plate and the 6th electrification pole plate.
Further, first tof tube and the second tof tube are mu-metal round tube, length be respectively 620 mm and
120mm, internal diameter 140mm, outer diameter 144mm, thickness 2mm.
Further, the voltage of the first band electrode plate, the second electrification pole plate and third electrification pole plate is respectively
3000V, 1990V, ground connection.
Further, it is described 4th electrification pole plate, the 5th electrification pole plate and the 6th electrification pole plate voltage be respectively be grounded,
300V、600V。
Further, the second flight tube voltage is 600V.
Further, the detector includes the first microchannel plate, the second microchannel plate and phosphorescent screen, and CCD is arranged in rear side
Camera is imaged.
Further, the voltage of first microchannel plate, the second microchannel plate and phosphorescent screen be respectively 600V, 2100V,
5600V。
The utility model compared with prior art, has the following advantages and effect：The realization of the utility model is to free flight
The Velocity map ion imaging instrument that row area dissociation fragment is differentiated realizes free flight area and secondary dissociation generation fragment ion progress occurs
Resolved detection excludes experiment interference factor, improves the accuracy that imaging experiment measures.
Description of the drawings
Fig. 1 is the signal for the Velocity map ion imaging instrument that free flight area dissociation fragment is differentiated in the realization of the utility model
Figure.
Fig. 2 is the detector schematic diagram of the utility model.
Fig. 3 is the electric field point for the Velocity map ion imaging instrument that free flight area dissociation fragment is differentiated in the realization of the utility model
Cloth schematic diagram.
Fig. 4 is the Velocity map ion imaging instrument schematic diagram based on three pieces of plate designs of the prior art.
Specific implementation mode
The utility model is described in further detail below in conjunction with the accompanying drawings and by embodiment, and following embodiment is pair
The explanation of the utility model and the utility model is not limited to following embodiment.
As shown in Figure 1, a kind of of the utility model realizes the Velocity map ion imaging differentiated to free flight area dissociation fragment
Instrument, including shell, conduit G1, pulse valve V1, laser beam L1, first band electrode plate P1, the second electrification pole plate P2, third belt electrode
Plate P3, the 4th electrification pole plate R1, the 5th electrification pole plate R2, the 6th electrification pole plate R3, detector D1, the first tof tube T1 and second
Tof tube T2, conduit G1 are horizontally set on shell one end end and the one end conduit G1 and shell end are passed through to be arranged in shell
Portion, pulse valve V1 are fixed on one end that conduit G1 is located in shell, first band electrode plate P1, the second electrification pole plate P2, third band
Electrode plate P3, the 4th electrification pole plate R1, the 5th electrification pole plate R2 and the 6th electrification pole plate R3 are the electrification pole plate of center opening,
First band electrode plate P1, the second electrification pole plate P2, third electrification pole plate P3 are vertically arranged composition imaging len, the 4th electrification successively
Pole plate R1, the 5th electrification pole plate R2, the 6th electrification pole plate R3 are vertically arranged composition damping field lens successively, the first tof tube T1 and
Second tof tube T2 is horizontally disposed and is fixed in shell, and imaging len setting is in first one end tof tube T1, damping
Field lens is arranged between the first tof tube T1 and the second tof tube T2, and detector D1 is fixed on shell other end end and is located at
Second one end tof tube T2.Meteorological sample is imported in conduit G1, imager vacuum cavity is sprayed by pulse valve V1, with laser beam L1
Photochemical effect occurs, parent ion and fragment ion are generated, in imaging len（P1,P2,P3）The focusing electric field of formation acts on
Under, flying through free flight area T1 can focus on detector D1, and detector D1 is by two pieces of micro-channel plate MCPs and phosphorescent screen group
At, behind setting CCD camera be imaged.However if fragment ion occurs to dissociate again in free flight area T1, here
Damping field lens（R1,R2,R3）It will play the role of resolution, and by damping the setting of field lens, keep original focal imaging
In the case of effect is constant, realizes and differentiated to the fragment that secondary dissociation generates occurs in free flight area T1, because of secondary solution
Different from the mass number of original fragment ion from the fragment ion of generation, the broken of different quality can be allowed by damping the setting of field lens
Piece ion is reached with the different flight time on detector D1, to realize resolved detection.
The thickness of first band electrode plate P1, the second electrification pole plate P2 and third electrification pole plate P3 are 2mm, and outer diameter is
The internal diameter of 140mm, first band electrode plate P1, the second electrification pole plate P2 and third electrification pole plate P3 be respectively 20mm, 30mm,
It is 38mm that 30mm, first band electrode plate P1, the second electrification pole plate P2 and third, which charge the distance between pole plate P3,.4th belt electrode
Plate R1, the 5th electrification pole plate R2 and the 6th electrification pole plate R3 thickness are 2mm, and outer diameter is 140mm, the 4th electrification pole plate R1, the
Five electrification pole plate R2 and the 6th electrification pole plate R3 internal diameters are 70mm, the 4th electrification pole plate R1, the 5th electrification pole plate R2 and the 6th
It is 20mm to charge the distance between pole plate R3.First tof tube T1 and the second tof tube T2 is mu-metal round tube, and length is respectively
620 mm and 120mm, internal diameter 140mm, outer diameter 144mm, thickness 2mm.
The voltage of first band electrode plate P1, the second electrification pole plate P2 and third electrification pole plate P3 be respectively 3000V, 1990V,
Ground connection.The voltage of 4th electrification pole plate R1, the 5th electrification pole plate R2 and the 6th electrification pole plate R3 are respectively ground connection, 300V, 600V.
Second tof tube T2 voltages are 600V.As shown in Fig. 2, detector D1 includes the first micro-channel plate MCP 1, the second microchannel plate
MCP2 and phosphorescent screen PS, rear side setting CCD camera are imaged.The electricity of first microchannel plate, the second microchannel plate and phosphorescent screen
Pressure is respectively 600V, 2100V, 5600V.
Shown in Velocity map ion imaging instrument no-voltage such as Fig. 3 (a) of the utility model, and under the setting of the above voltage, without
In the case of enabling damping field, the corresponding energy of position of entire newly utility model device is distributed as shown in Fig. 3 (b).In order to feasible to its
Property analyzed, we simulate it using general SIMION softwares in the world, it is assumed that C6H5CH3+ in experimentation
Ion dissociates inside tof tube T1, the C6H5CH3 of simulation+Ion is chipping after the 118mm for flying into tof tube T1
Generate C6H5+Ion, at this time C6H5CH3+Ion and C6H5+The mass number of ion is respectively 90amu and 77amu, is sent out by simulation
It is existing they do not enabled in damping field, such as Fig. 3 (c), detector is reached with 15.70 microsecond of identical time, cannot be by
It distinguishes.And after enabling damping field, such as Fig. 3 (d), field distribution is rebuild, C6H5CH3+Ion and C6H5+Ion, which reaches, to be visited
The time for surveying device is respectively 18.99 microseconds and 17.93 microseconds can be distinguished very well such as Fig. 3 (e).
The Velocity map ion imaging instrument that free flight area dissociation fragment is differentiated in the realization of the utility model realizes free flight
Row area occurs secondary dissociation and generates fragment ion progress resolved detection, excludes experiment interference factor, improves what imaging experiment measured
Accuracy.
Described in this specification above content is only to the utility model example explanation.The utility model
Person of ordinary skill in the field can do described specific embodiment various modifications or supplement or use similar side
Formula substitutes, content without departing from the utility model specification or beyond the scope defined by this claim, should all
Belong to the scope of protection of the utility model.
Claims (9)
1. a kind of realizing the Velocity map ion imaging instrument differentiated to free flight area dissociation fragment, it is characterised in that：Including shell, leading
Pipe, pulse valve, laser beam, first band electrode plate, the second electrification pole plate, third electrification pole plate, the 4th electrification pole plate, the 5th electrification
Pole plate, the 6th electrification pole plate, detector, the first tof tube and the second tof tube, conduit are horizontally set on shell one end end simultaneously
And tube at one end passes through shell end to be arranged inside housings, pulse valve is fixed on one end that conduit is located in shell, first band
Electrode plate, the second electrification pole plate, third electrification pole plate, the 4th electrification pole plate, the 5th electrification pole plate and the 6th electrification pole plate are
The electrification pole plate of center opening, first band electrode plate, the second electrification pole plate, third electrification pole plate are vertically arranged composition imaging successively
Lens, the 4th electrification pole plate, the 5th electrification pole plate, the 6th electrification pole plate are vertically arranged composition damping field lens successively, and first flies
Row pipe is horizontally disposed with the second tof tube and is fixed in shell, and imaging len setting is in first tof tube one end, resistance
Buddhist nun's field lens is arranged between the first tof tube and the second tof tube, and detector is fixed on shell other end end and is located at second
Tof tube one end.
2. described in accordance with the claim 1 realize the Velocity map ion imaging instrument differentiated to free flight area dissociation fragment, feature
It is：The thickness of the first band electrode plate, the second electrification pole plate and third electrification pole plate is 2mm, and outer diameter is 140mm, the
The internal diameter of one electrification pole plate, the second electrification pole plate and third electrification pole plate is respectively 20mm, 30mm, 30mm, first band electrode plate,
The distance between second electrification pole plate and third electrification pole plate are 38mm.
3. described in accordance with the claim 1 realize the Velocity map ion imaging instrument differentiated to free flight area dissociation fragment, feature
It is：The 4th electrification pole plate, the 5th electrification pole plate and the 6th electrification electrode thickness are 2mm, and outer diameter is 140mm, the 4th
It is 70mm to charge pole plate, the 5th electrification pole plate and the 6th electrification pole plate internal diameter, the 4th electrification pole plate, the 5th electrification pole plate and the
The distance between six electrification pole plates are 20mm.
4. described in accordance with the claim 1 realize the Velocity map ion imaging instrument differentiated to free flight area dissociation fragment, feature
It is：First tof tube and the second tof tube are mu-metal round tube, and length is respectively 620 mm and 120mm, and internal diameter is
140mm, outer diameter 144mm, thickness 2mm.
5. described in accordance with the claim 1 realize the Velocity map ion imaging instrument differentiated to free flight area dissociation fragment, feature
It is：The voltage of the first band electrode plate, the second electrification pole plate and third electrification pole plate is respectively 3000V, 1990V, ground connection.
6. described in accordance with the claim 1 realize the Velocity map ion imaging instrument differentiated to free flight area dissociation fragment, feature
It is：The voltage of the 4th electrification pole plate, the 5th electrification pole plate and the 6th electrification pole plate is respectively ground connection, 300V, 600V.
7. described in accordance with the claim 1 realize the Velocity map ion imaging instrument differentiated to free flight area dissociation fragment, feature
It is：The second flight tube voltage is 600V.
8. described in accordance with the claim 1 realize the Velocity map ion imaging instrument differentiated to free flight area dissociation fragment, feature
It is：The detector includes the first microchannel plate, the second microchannel plate and phosphorescent screen, and rear side setting CCD camera is imaged.
9. realizing the Velocity map ion imaging instrument differentiated to free flight area dissociation fragment, feature according to claim 8
It is：The voltage of first microchannel plate, the second microchannel plate and phosphorescent screen is respectively 600V, 2100V, 5600V.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111863583A (en) * | 2020-07-17 | 2020-10-30 | 中国科学技术大学 | Ion lens imaging method and system for ion molecule reaction |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111863583A (en) * | 2020-07-17 | 2020-10-30 | 中国科学技术大学 | Ion lens imaging method and system for ion molecule reaction |
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