CN104934288B - High time resolution ion speed imager based on tetra-pole plate design - Google Patents
High time resolution ion speed imager based on tetra-pole plate design Download PDFInfo
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- CN104934288B CN104934288B CN201510237939.4A CN201510237939A CN104934288B CN 104934288 B CN104934288 B CN 104934288B CN 201510237939 A CN201510237939 A CN 201510237939A CN 104934288 B CN104934288 B CN 104934288B
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Abstract
The invention discloses a high time resolution ion speed imager based on tetra-pole plate design; the high time resolution ion speed imager comprises a MCP detector, a flight pipe, and a cylinder hollow cavity with one closed end and an opening end; the MCP detector, the flight pipe and the cylinder cavity are coaxially arranged; the MCP is arranged on one end of the fight pipe; the other end of the flight pipe extends into the cylinder cavity from the opening end; in the cylinder cavity, first to fourth pole plates are coaxially arranged in sequence between the closed end of the cylinder cavity and the other end of the flight pipe; the first to fourth pole plates are in a round shape, and a center of the round is provided with a round hole; the center round holes of the second, third and fourth pole plates are equal in diameter; the center round hole of the first pole plate is smaller than that of the second to fourth pole plates; the first to fourth pole plates are arranged at equal intervals. The high time resolution ion speed imager realize vertical focusing of ion flight time, thus greatly improving ionic flight time mass spectrum detection resolution.
Description
Technical field
The invention discloses a kind of high time resolution Velocity map ion imaging instrument designed based on quadripolar plate, and in particular to a kind of
The measuring method of ion kinetic energy and charge-mass ratio.
Background technology
Current Velocity map ion imaging instrument is that Dutch scientist Eppink and Parker was designed in 1997 at present, Ta Mentong
Cross three pieces of pole plates with circular hole of design, under certain voltage configuration, form ion lens, realize to identical speed still
The charged particle of diverse location is focused, and is then collected by detector.As shown in Figure 1 a, 1 b, under ion lens effect,
The Focusing of charged particles of diverse location which greatly enhances the resolution of Velocity map ion imaging on a point of detector.
However, on Velocity map ion imaging device current at present, the ion flight time mass resolution for measuring is very
It is low.This is because the imager only realizes the transverse focusing of position, the longitudinal focusing without realizing the time.Position it is horizontal
Focus on as shown in Fig. 2 (a), refer to that the charged ion of diverse location is focused on the same position of detector, this and velocity imaging
Resolution it is related.And the longitudinal focusing of time refers to that the different charged ion flight in longitudinal direction is the same to the time of detector
, such as shown in Fig. 2 (b).The realization of the longitudinal focusing of time can greatly improve the mass spectrographic resolution of ion flight time, because
It causes the time of ion flight to the detector of identical speed identical.
The content of the invention
The technical problem to be solved is：For the defect of prior art, there is provided a kind of to be designed based on quadripolar plate
High time resolution Velocity map ion imaging instrument, while imaging horizontal to ion, realize the flight time longitudinal focusing of ion.
Showing as in physical measurement：While high-resolution Velocity map ion imaging is obtained, the mass spectrographic high score of ion flight time is realized
Distinguish detection.
The present invention is employed the following technical solutions to solve above-mentioned technical problem：
A kind of high time resolution Velocity map ion imaging instrument designed based on quadripolar plate, including MCP detectors, tof tube and one
End seal closes the hollow circular cylindrical cavity that the other end is opened wide, and the MCP detectors, tof tube and circular cylindrical cavity are coaxially disposed,
MCP is arranged at one end of tof tube, and the other end of tof tube inserts into the inner portion, the circle from the open end of the circular cylindrical cavity
Inside cylindrical chamber, be also coaxially disposed between the other end of the blind end from circular cylindrical cavity to tof tube first to
Quadripolar plate, first to fourth pole plate are circle, and circular center offers circular hole, second to quadripolar plate center circle
Bore dia is identical, the center hole diameter of the center hole diameter of the first pole plate less than second to quadripolar plate, and first to fourth
Pole plate is arranged at equal intervals.
Used as present invention further optimization scheme, the tof tube is mu-metal round tube.
Used as present invention further optimization scheme, the internal diameter of the mu-metal round tube is 96mm, and external diameter is 100mm, thick
Spend for 2mm.
As present invention further optimization scheme, the spacing between first pole plate and the blind end of circular cylindrical cavity
For 20mm, the quadripolar plate is 67mm with flight tube pitch.
Used as present invention further optimization scheme, the thickness of first to fourth pole plate is 2mm, and external diameter is
100mm, a diameter of 4mm of center hole of the first pole plate, second to the quadripolar plate a diameter of 20mm of center hole.
Used as present invention further optimization scheme, the voltage design of first to fourth pole plate is：First pole plate pair
Answer voltage 4000V, the second pole plate corresponding voltage 3150V, tri-electrode corresponding voltage 1470V, quadripolar plate P4 corresponding voltages 0V；
The MCP detectors, tof tube and circular cylindrical cavity are grounded.
The present invention adopts above technical scheme compared with prior art, with following technique effect：The present invention realizes ion
Flight time longitudinal focusing, substantially increase detection ion flight time mass spectrum resolution.
Description of the drawings
Fig. 1 a are the existing Velocity map ion imaging instrument design drawinies based on three pieces of plate designs.
Fig. 1 b are current art intermediate ion lens Potential Distributing design sketchs.
Fig. 2 a are the position transverse focusing schematic diagrams of ion.
Fig. 2 b are the flight time longitudinal focusing schematic diagrams of ion.
Fig. 3 is the comparison schematic diagram of prior art invention and the present invention.
Fig. 4 a are the internal structure design figures of the ion imaging instrument designed based on quadripolar plate in the present invention.
Fig. 4 b are five kinds of initial velocity ion flight focusing effect figures of diverse location in the present invention.
Fig. 5 is the electric potential energy scattergram of quadripolar plate ion lens in the present invention.
Specific embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the drawings, wherein ad initio
Same or similar element or the element with same or like function are represented to same or similar label eventually.Below by ginseng
The embodiment for examining Description of Drawings is exemplary, is only used for explaining the present invention, and is not construed as limiting the claims.
Below in conjunction with the accompanying drawings technical scheme is described in further detail：
In the present invention based on quadripolar plate design ion imaging instrument internal structure design figure as shown in fig. 4 a, the present invention in
Five kinds of initial velocity ion flight focusing effect figures of diverse location are as shown in Figure 4 b.The high time resolution designed based on quadripolar plate
Velocity map ion imaging instrument, including the hollow circular cylindrical cavity that MCP detectors, tof tube and one end closing other end is opened wide, institute
State MCP detectors, tof tube and circular cylindrical cavity to be coaxially disposed, MCP is arranged at one end of tof tube, the other end of tof tube from
The open end of the circular cylindrical cavity inserts into the inner portion, inside the circular cylindrical cavity, the blind end from circular cylindrical cavity to
First to fourth pole plate is coaxially disposed between the other end of tof tube also, first to fourth pole plate is circle, circle
The center of shape offers circular hole, and second to quadripolar plate center hole diameter is identical, and the center hole diameter of the first pole plate is little
In second to quadripolar plate center hole diameter, first to fourth pole plate is arranged at equal intervals.
First to fourth 4 pieces of pole plates（P1 to P4）To open the circular pole plate of circular hole, thickness is 2mm, and external diameter is
100mm, P1 internal diameter 4mm, P2, P3 and P4 internal diameter are 20mm；The distance between adjacent plate is 20mm, and P1 with cavity spacing is
20mm；P4 is 67mm with flight tube pitch；Tof tube is mu-metal round tube, and internal diameter is 96mm, and external diameter is 100mm, and thickness is
2mm。
The electric potential energy scattergram of quadripolar plate ion lens in the present invention is as shown in figure 5, being specifically configured to for voltage design：The
One piece of pole plate P1 corresponding voltage 4000V, second piece of pole plate P2 corresponding voltage 3150V, the 3rd piece of pole plate P3 corresponding voltage 1470V,
4th piece of pole plate P4 corresponding voltage 0V, remaining（Tof tube containing mu-metal）It is grounded.
Prior art is invented and the comparison schematic diagram of the present invention detects ion as shown in figure 3, the invention is substantially increased
The resolution of flight time mass spectrum.Testing procedure most authoritative in the world for ions follow trajectories at present is SIMION.We
Test verification is carried out using invention of latest edition SIMION8.1 of the program to this application, and compare the invention with it is existing
The assay of technological invention.Comparative result is as shown in table 1, during the flight that four based on this application piece plate designs device is measured
Between mass spectrographic spectral peak width t4 be significantly less than the spectral peak width t3 that measures of prior-art devices designed based on tri-electrode.
Under the different dispersion of distribution of ion source, the resolution multiple t of raising3/∆t4Multiple is different.Ion source distribution is wider, new technique
Carry that high-resolution multiple is bigger, i.e. the high-resolution effect of new technique is more obvious.When ion source width x is 7mm, new skill
Art can reach 24.32 times relative to the flight time mass spectrum resolution improved by prior art.
Table 1. under different radii (x) ion source distribution, the flight time mass spectrum spectral peak width that analogue measurement is obtained
t3(art methods) and t4The comparison of (present invention)：
Embodiments of the present invention are explained in detail above in conjunction with accompanying drawing, but the present invention is not limited to above-mentioned enforcement
Mode, in the ken that those of ordinary skill in the art possess, can be with the premise of without departing from present inventive concept
Make a variety of changes.The above, is only presently preferred embodiments of the present invention, not makees any pro forma limit to the present invention
System, although the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any to be familiar with this professional skill
Art personnel, in the range of without departing from technical solution of the present invention, when using the technology contents of the disclosure above make it is a little change or
The Equivalent embodiments of equivalent variations are modified to, as long as being without departing from technical solution of the present invention content, according to the technology reality of the present invention
Matter, within the spirit and principles in the present invention, any simple modification, equivalent and the improvement made by above example
Deng still falling within the protection domain of technical solution of the present invention.
Claims (5)
1. a kind of high time resolution Velocity map ion imaging instrument designed based on quadripolar plate, including MCP detectors, tof tube and one end
The hollow circular cylindrical cavity that the closing other end is opened wide, the MCP detectors, tof tube and circular cylindrical cavity are coaxially disposed, MCP
One end of tof tube is arranged at, the other end of tof tube inserts into the inner portion from the open end of the circular cylindrical cavity, and its feature exists
In：Inside the circular cylindrical cavity, also coaxially set successively between the other end of the blind end from circular cylindrical cavity to tof tube
It is equipped with first to fourth pole plate, first to fourth pole plate is circle, circular center offers circular hole, second to the is quadrupole
The center hole diameter of plate is identical, the center hole diameter of the center hole diameter of the first pole plate less than second to quadripolar plate,
First to fourth pole plate is arranged at equal intervals；The voltage design of first to fourth pole plate is：First pole plate corresponding voltage
4000V, the second pole plate corresponding voltage 3150V, tri-electrode corresponding voltage 1470V, quadripolar plate P4 corresponding voltages 0V；It is described
MCP detectors, tof tube and circular cylindrical cavity are grounded.
2. a kind of high time resolution Velocity map ion imaging instrument designed based on quadripolar plate as claimed in claim 1, its feature are existed
In：The tof tube is mu-metal round tube.
3. a kind of high time resolution Velocity map ion imaging instrument designed based on quadripolar plate as claimed in claim 2, its feature are existed
In：The internal diameter of the mu-metal round tube is 96mm, and external diameter is 100mm, and thickness is 2mm.
4. as described in claim 1 or 3 it is a kind of based on quadripolar plate design high time resolution Velocity map ion imaging instrument, its feature
It is：Spacing between first pole plate and the blind end of circular cylindrical cavity is 20mm, and described the between quadripolar plate and tof tube
Away from for 67mm.
5. a kind of high time resolution Velocity map ion imaging instrument designed based on quadripolar plate as claimed in claim 4, its feature are existed
In：The thickness of first to fourth pole plate is 2mm, and external diameter is 100mm, a diameter of 4mm of center hole of the first pole plate,
Second to the quadripolar plate a diameter of 20mm of center hole.
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| CN106057631B (en) * | 2016-07-22 | 2018-03-06 | 南京信息工程大学 | Image size tunable optical electronic imaging instrument |
| CN106057629B (en) * | 2016-07-26 | 2018-04-13 | 南京信息工程大学 | A kind of existing fringing field photoelectronic imaging instrument |
| CN107564797B (en) * | 2017-08-02 | 2019-01-11 | 金华职业技术学院 | A method of product after research ionic light excitation |
| CN107507754B (en) * | 2017-08-02 | 2019-02-15 | 金华职业技术学院 | A method of for studying product after ionic light excites |
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| CN101625326B (en) * | 2009-07-21 | 2011-03-30 | 华东师范大学 | Molecular photodissociation ionization velocity imaging device |
| CN102830095A (en) * | 2011-06-14 | 2012-12-19 | 华东师范大学 | Molecular four-dimensional imaging system |
| CN104597477B (en) * | 2013-10-31 | 2017-06-30 | 中国科学院大连化学物理研究所 | A kind of photoelectronic imaging device for studying anion system |
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