CN103762149B - A kind of device improving velocity of electrons imaging resolution - Google Patents
A kind of device improving velocity of electrons imaging resolution Download PDFInfo
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- CN103762149B CN103762149B CN201310750532.2A CN201310750532A CN103762149B CN 103762149 B CN103762149 B CN 103762149B CN 201310750532 A CN201310750532 A CN 201310750532A CN 103762149 B CN103762149 B CN 103762149B
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Abstract
The invention discloses a kind of device improving velocity of electrons imaging resolution, described device comprises vacuum circular tubular cavity and is positioned over repeller in vacuum circular tubular cavity successively, extracts pole, the first earth electrode, the second earth electrode, microchannel plate, fluorescent plate and CCD camera, also compensating pole is provided with between described second earth electrode and microchannel plate, described second earth electrode and compensating pole form compensation flight range, the molecular focal plane of the electricity of different-energy are become vertically parallel with detector panel from inclination.Implement to the invention enables the molecular focal plane of the electricity of different-energy to be become from inclination vertically parallel with detector panel, solve spatially Electron Beam Focusing time focal plane and detector not in the problem of same perpendicular, thus improve the resolution of velocity imaging device.
Description
Technical field
The present invention relates to molecular reaction dynamics field, be specifically related to a kind of device improving velocity of electrons imaging resolution.
Background technology
In the past few decades, important role is play in the cognitive process that electronic imaging technology reacts at the photodissociation of laser and molecule, in interaction between laser and metal, sixty-four dollar question is the product energies distribution of dissociating, the Information Problems such as the closedown of angular distribution and VELOCITY DISTRIBUTION and reaction channel and unlatching, velocity of electrons formation method was owing to both can record the amount that in interaction between laser and metal process, these are associated simultaneously, experimentation is relatively simple, experimental result can be represented very intuitively again, so greatly promoted the extensive use of velocity imaging technology in molecular reaction dynamics research, become the dynamic (dynamical) technical way of research molecular photodissociation.
First this technology is proposed in 1987 by Chandler and Houston3G two people, improved by EPPink and Parker subsequently, ion lens is formed with the pole plate of 3 central aperture, this method is in the device of similar time-of-flight mass spectrometer, introduce the ion lens technology being similar to optical lens, diverse location is in by space, but there is the ion focusing of identical speed on the same point of detector, thus the ion with the speed of formed objects also just focuses on the same annulus of detector, again with to the highstrung microchannel plate in position as detector, thereafter fluorescent plate is being connected and CCD camera gets final product imaging, then by the image that obtains again further mathematical analysis just obtain ion Energy distribution in the reaction, the a series of information such as angular distribution and VELOCITY DISTRIBUTION.
But, its resolution of velocity imaging device formed for the pole plate of 3 center drillings is not high, one very chief reason be exactly due to electron beam when converging the Focus of different-energy not in a plane, thus there is a very large gradient in the focal plane formed, causes the resolution of velocity imaging device to be difficult to improve again.
Summary of the invention
For above defect or the Improvement requirement of prior art, the object of the present invention is to provide a kind of device improving velocity of electrons imaging resolution, device have employed and adds a compensating electric field in the movement area of electron beam in traditional Velocity map ion imaging technical foundation, the focal plane with very big-inclination that the electronics of different-energy is formed originally can be good at converging on the perpendicular that parallel with detector, thus make image that detector obtains more clear, and then improve the resolution of velocity of electrons imaging device.
The technical solution adopted for the present invention to solve the technical problems is, a kind of device improving velocity of electrons imaging resolution is provided, described device comprises vacuum circular tubular cavity and is positioned over the repeller in vacuum circular tubular cavity successively, extract pole, first earth electrode, second earth electrode, microchannel plate, fluorescent plate and CCD camera, also compensating pole is provided with between described second earth electrode and microchannel plate, described second earth electrode and compensating pole form compensation flight range, focus in advance for making the electronics that initial velocity is little originally, thus it is vertically parallel with detector panel to make the molecular focal plane of the electricity of different-energy be become from inclination.
In the device of raising velocity of electrons imaging resolution of the present invention, described compensating pole adopts aperture plate, described compensating pole comprises two along the symmetrical curved surface aperture plate of the horizontal center line axis of vacuum circular tubular cavity, the arc-shaped aperture plate that described curved surface aperture plate comprises plane aperture plate and is connected with plane aperture plate side, described arc-shaped aperture plate longitudinal profile is quarter circular arc, and described plane aperture plate opposite side is connected with vacuum circular tubular cavity inner wall.
In the device of raising velocity of electrons imaging resolution of the present invention, described repeller, extract pole, the first earth electrode, the second earth electrode, compensating pole, microchannel plate, fluorescent plate and CCD camera geometric center on a horizontal axis.
In the device of raising velocity of electrons imaging resolution of the present invention, the aperture plate thickness of described compensating pole is 0.01mm-1mm, the quarter circular arc radius that described its longitudinal profile of arc-shaped aperture plate is corresponding is 14mm-38mm, and the length of straigh line that described plane aperture plate longitudinal profile is corresponding is 1mm-20mm.
In the device of raising velocity of electrons imaging resolution of the present invention, the long 64mm-178mm of described vacuum circular tubular cavity, diameter 30mm-80mm; The zone of action of laser and molecular beam is at distance repeller 1mm-19mm place, and the zone of action is 58mm-168mm apart from the effective length of microchannel plate.
In the device of raising velocity of electrons imaging resolution of the present invention, described first earth electrode and the second earth electrode are the circular flat aperture plate that thickness is 0.01mm-1mm, diameter is 30mm-80mm.
In the device of raising velocity of electrons imaging resolution of the present invention, described repeller is 1mm-5mm apart from the distance of vacuum circular tubular cavity inner left wall, the distance extracting pole span repeller is 5mm-20mm, first earth electrode is 10mm-30mm apart from the distance of extraction pole, and the second earth electrode is 25mm-50mm apart from the distance of the first earth electrode; Compensating pole farthest is 16mm-48mm apart from the distance of the second earth electrode, and the distance the most nearby apart from the second earth electrode is 2mm-10mm; Microchannel plate is 5mm-15mm apart from the distance of compensating pole.
In the device of raising velocity of electrons imaging resolution of the present invention, described repeller, extraction pole external diameter are 30mm-80mm, thickness is the stainless steel plectane of 1mm-4mm, described repeller plectane center has the circular hole that diameter is 1mm-16mm, and the center of described extraction pole has the circular hole that diameter is 5mm-60mm.
In the device of raising velocity of electrons imaging resolution of the present invention, described first earth electrode, the second earth electrode voltage are zero; Repeller, extraction pole, compensating pole load different voltage according to the size of spacing distance each other and electron energy.
Therefore, the present invention can obtain following beneficial effect: laser interacts at repeller and extraction interpolar and gas molecule bundle, produce electronics be ostracised pole and extract pole formed electric field accelerate fast and launch the electronics of different-energy, behind the field-free flight region between the first earth electrode and the second earth electrode, enter the compensation flight range be made up of the second earth electrode and compensating pole, adding of compensating electric field makes the electronics that initial velocity is little originally to focus in advance, thus it is vertically parallel with detector panel to make the molecular focal plane of the electricity of different-energy be become from inclination, simultaneously, compensating pole selects structure as described in the present invention, the field-free flight region formed between the first earth electrode and the second earth electrode can be good at the impact eliminating irregular electric field suffered when electronics flies in vacuum tube, the compensation flight range that second earth electrode and compensating pole form simultaneously can produce a faint arc electric potential field, the electrons being arranged in the denser place of electric field line, arc field converges in advance, thus effectively solve spatially Electron Beam Focusing time focal plane and detector not in the problem of same perpendicular, drastically increase the resolution of velocity imaging device.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the apparatus structure schematic diagram that the present invention improves velocity of electrons imaging resolution;
The Electron energy distribution figure that Fig. 2 is the laser of one embodiment of the invention and molecular beam zone of action size to be inputted when being 0.6mm;
The Electron energy distribution figure that Fig. 3 is the laser of one embodiment of the invention and molecular beam zone of action size to be exported when being 0.6mm;
The imaging resolution curve that Fig. 4 is the laser of one embodiment of the invention and the molecular beam zone of action size when being 0.6mm and the comparison diagram of existing apparatus imaging resolution curve under equal conditions;
The imaging resolution curve that Fig. 5 is the laser of one embodiment of the invention and the molecular beam zone of action size when being 1.2mm and the comparison diagram of existing apparatus imaging resolution curve under equal conditions;
Fig. 6 is the area electron beam length of field of one embodiment of the invention energy resolution curve chart when being respectively 1.0mm, 1.8mm, 3.0mm.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each execution mode of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
Fig. 1 is the apparatus structure schematic diagram that the present invention improves velocity of electrons imaging resolution.As shown in Figure 1, the device that the present invention improves velocity of electrons imaging resolution comprises vacuum circular tubular cavity 1 and is positioned over the repeller 2 of vacuum cavity 1 inside successively, extracts pole 3, first earth electrode 4, second earth electrode 5, compensating pole 6, microchannel plate 7, fluorescent plate 8 and CCD camera 9.Wherein, the second earth electrode 5 and compensating pole 6 form compensation flight range, and for making the electronics that initial velocity is little originally focus in advance, thus it is vertically parallel with detector panel that the molecular focal plane of the electricity of different-energy is become from inclination.
In the device of raising velocity of electrons imaging resolution of the present invention, compensating pole 6 adopts aperture plate, compensating pole 6 comprises two integrated curved surface aperture plates symmetrical along the horizontal center line axis of vacuum circular tubular cavity 1, the arc-shaped aperture plate that described curved surface aperture plate comprises plane aperture plate and is connected with plane aperture plate side, described arc-shaped aperture plate longitudinal profile is quarter circular arc, and described plane aperture plate opposite side is connected with vacuum circular tubular cavity 1 inwall.The geometric center of repeller 2, extraction pole 3, first earth electrode 4, second earth electrode 5, compensating pole 6, microchannel plate 7, fluorescent plate 8 and CCD camera 9 is on a horizontal axis.
The aperture plate thickness of compensating pole 6 is 0.01mm-1mm, and the quarter circular arc radius that its longitudinal profile of arc-shaped aperture plate is corresponding is 14mm-38mm, and the length of straigh line that plane aperture plate longitudinal profile is corresponding is 1mm-20mm.The long 64mm-178mm of vacuum circular tubular cavity 1, diameter 30mm-80mm; The zone of action of laser and molecular beam is at distance repeller 2 apart from being 1-19mm place, and the zone of action is 58mm-168mm apart from the effective length of microchannel plate 7.
First earth electrode 4 and the second earth electrode 5 are the circular flat aperture plate that thickness is 0.01mm-1mm, diameter is 30mm-80mm.Repeller 2 is 1mm-5mm apart from the distance of vacuum circular tubular cavity 1 inner left wall, extraction pole 3 is 5mm-20mm apart from the distance of repeller 2, first earth electrode 4 is 10mm-30mm apart from the distance of extraction pole 3, and the second earth electrode 5 is 25mm-50mm apart from the distance of the first earth electrode 4; Compensating pole 6 farthest is 16mm-48mm apart from the distance of the second earth electrode 5, and the distance the most nearby apart from the second earth electrode 5 is 2mm-10mm; Microchannel plate 7 is 5mm-15mm apart from the distance of compensating pole 6.Repeller 2, extract pole 3 for external diameter be 30mm-80mm, thickness is the stainless steel plectane of 1mm-4mm, and repeller 2 plectane center has the circular hole that diameter is 1mm-16mm, extraction pole 3 center have the circular hole that diameter is 5mm-60mm.First earth electrode 4, second earth electrode 5 voltage is zero; Repeller 2, extraction pole 3, compensating pole 6 load different voltage according to the size of Distance geometry electron energy each other.
Below in conjunction with specific embodiment, technical scheme of the present invention is described further.
In the device of the raising velocity of electrons imaging resolution of the present embodiment, the geometric center of repeller 2, extraction pole 3, first earth electrode 4, second earth electrode 5, compensating pole 6, microchannel plate 7, fluorescent plate 8 and CCD camera 9 is on a horizontal axis.Wherein, the long 129mm(of vacuum circular tubular cavity 1 is not containing microchannel plate 7 and the cavity portion shared by fluorescent plate 8), diameter is 80mm.
Repeller 2 is external diameters is 80mm, and center drilling diameter is 2mm, and thickness is the stainless steel plectane of 1mm; Extraction pole 3 is external diameters is 80mm, and center drilling diameter is 30mm, and thickness is the stainless steel plectane of 1mm; First earth electrode 4 and the second earth electrode 5 are the circular flat aperture plate that thickness is 0.01mm, diameter is 80mm; Compensating pole 6 comprises two along the symmetrical curved surface aperture plate of the horizontal center line axis of vacuum circular tubular cavity, the arc-shaped aperture plate that curved surface aperture plate comprises plane aperture plate and is connected with plane aperture plate side, arc-shaped aperture plate longitudinal profile is quarter circular arc, and plane aperture plate opposite side is connected with vacuum circular tubular cavity 1 inwall.The aperture plate thickness of compensating pole 6 is 0.01mm, and the quarter circular arc radius that its arc-shaped aperture plate longitudinal profile is corresponding is 32mm, and the length of straigh line that plane aperture plate longitudinal profile is corresponding is 8mm.
Repeller 2 is 5mm apart from vacuum circular tubular cavity 1, and extracting pole 3 is 14mm apart from repeller 2, and the first earth electrode 4 is 18mm apart from extraction pole 3, and the second earth electrode 5 is 45mm apart from the first earth electrode 4; The distance of compensating pole 6 farthest and the second earth electrode 5 is 36mm, and the distance the most nearby apart from the second earth electrode 5 is 4mm; The distance of microchannel plate distance 7 compensated distance poles 6 is 10mm.
The zone of action of laser and molecular beam gas is at distance repeller 2 apart from being 7mm place, and the zone of action is 117mm apart from the effective length of microchannel plate 7.First earth electrode 4, second earth electrode 5 voltage is 0V, extracts pole 3, repeller 2, compensating pole 6 voltage are respectively-2500V ,-1790V, ratio that-190V(extracts pole 3 and repeller 2 voltage, compensating pole 6 arrange in the ratio of 71.6%, 7.6% respectively with the ratio of repeller 2 voltage).
9.1 × 10 are respectively with quality, carried charge
-31kg, 1.6 × 10
-19a large amount of Single Electrons of C are as electron source, and its initial velocity direction is perpendicular to the axle of tof tube; With Energy distribution from 10ev to 100ev at interval of 5ev, then a large amount of electronics is focused on " statistics ".
Fig. 2 is the above embodiment of the present invention laser and molecular beam zone of action size electronics inputs when being 0.6mm energy profile, the Electron energy distribution figure that Fig. 3 is the laser of the above embodiment of the present invention and molecular beam zone of action size to be exported when being 0.6mm; The electronics of the different-energy inputted as can be seen from Figure can keep good consistency in output final after this device in error range.
The imaging resolution curve chart (bold portion) that Fig. 4 is the above embodiment of the present invention laser and the molecular beam zone of action size when being 0.6mm with existing apparatus (comprise vacuum circular tubular cavity, repeller, extraction pole, earth electrode, fluorescent plate, CCD camera, wherein repeller, extract pole, earth electrode is all made up of the battery lead plate of three center drillings) comparison diagram of imaging resolution curve (dotted portion) under equal conditions.Resolution non-optimal that traditional velocity of electrons imaging resolution device is obtained can be seen by the curve in Fig. 4, also can be very fuzzy owing to differentiating its image obtained of rate variance, well can not differentiate the electronics in certain limit under each energy, and its energy resolution of electronics adopting this device to focus on can below the high-resolution of 0.6%, which no matter can well realize focusing on for the electronics in energy range, obtain the image that a resolution is high, prove that device of the present invention effectively can improve the resolution of velocity of electrons imaging thus.
Fig. 5 is that the imaging resolution curve chart (bold portion) when laser and molecular beam zone of action size are 1.2mm in the above embodiment of the present invention (comprises vacuum circular tubular cavity with existing apparatus, repeller, extract pole, earth electrode, microchannel plate, fluorescent plate, CCD camera, wherein repeller, extract pole, earth electrode is all made up of the battery lead plate of three center drillings) comparison diagram of imaging resolution curve (dotted portion) under equal conditions, the resolution of we can see in the zone of action by curve in figure when being 1.2mm existing apparatus is below 4%, and can well remain on less than 0.7% in its resolution of this device of employing, its superior resolution capability is again presented intuitively by curve.
Fig. 6 is the energy resolution curve chart of electronics when laser and molecular beam zone of action size are respectively 1.0mm, 1.8mm, 3.0mm in the above embodiment of the present invention.As seen from Figure 6, the zone of action of its energy resolution of electronics adopting this device to focus on no matter laser and molecular beam is either large or small can be remained in a very high level of resolution, even 2.25% also low many also when 1.3% is 0.6mm than the conventional apparatus zone of action of its poorest resolution when the zone of action is 3.0mm.
Above result shows, adopt this velocity of electrons imaging device to Electron Beam Focusing, very well can differentiate the energy of each electronics within the scope of it, its resolution performance is far away higher than existing apparatus.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. one kind is improved the device of velocity of electrons imaging resolution, described device comprises vacuum circular tubular cavity (1) and is positioned over the repeller (2) in vacuum circular tubular cavity (1) successively, extract pole (3), first earth electrode (4), second earth electrode (5), microchannel plate (7), fluorescent plate (8) and CCD camera (9), it is characterized in that, compensating pole (6) is also provided with between described second earth electrode (5) and microchannel plate (7), described second earth electrode (5) and compensating pole (6) form compensation flight range, thus it is vertically parallel with detector panel to make the molecular focal plane of the electricity of different-energy be become from inclination, described repeller (2), extract pole (3), first earth electrode (4), second earth electrode (5), compensating pole (6), microchannel plate (7), the geometric center of fluorescent plate (8) and CCD camera (9) is on a horizontal axis.
2. the device improving velocity of electrons imaging resolution as claimed in claim 1, it is characterized in that, described compensating pole (6) adopts aperture plate, described compensating pole (6) comprises two along the symmetrical curved surface aperture plate of the horizontal center line axis of vacuum circular tubular cavity (1), the arc-shaped aperture plate that described curved surface aperture plate comprises plane aperture plate and is connected with plane aperture plate side, described arc-shaped aperture plate longitudinal profile is quarter circular arc, and described plane aperture plate opposite side is connected with vacuum circular tubular cavity (1) inwall.
3. the device improving velocity of electrons imaging resolution as claimed in claim 2, it is characterized in that, the aperture plate thickness of described compensating pole (6) is 0.01mm-1mm, the quarter circular arc radius that described its longitudinal profile of arc-shaped aperture plate is corresponding is 14mm-38mm, and the length of straigh line that described plane aperture plate longitudinal profile is corresponding is 1mm-20mm.
4. the device improving velocity of electrons imaging resolution as claimed in claim 3, is characterized in that, the long 64mm-178mm of described vacuum circular tubular cavity (1), diameter 30mm-80mm; The zone of action of laser and molecular beam is at distance repeller (2) 1mm-19mm place, and the zone of action is 58mm-168mm apart from the effective length of microchannel plate (7).
5. the device improving velocity of electrons imaging resolution as claimed in claim 4, it is characterized in that, described first earth electrode (4) and the second earth electrode (5) are the circular flat aperture plate that thickness is 0.01mm-1mm, diameter is 30mm-80mm.
6. the device improving velocity of electrons imaging resolution as claimed in claim 5, it is characterized in that, described repeller (2) is 1mm-5mm apart from the distance of vacuum circular tubular cavity (1) inner left wall, the distance extracting pole (3) distance repeller (2) is 5mm-20mm, first earth electrode (4) is 10mm-30mm apart from the distance of extraction pole (3), and the second earth electrode (5) is 25mm-50mm apart from the distance of the first earth electrode (4); Compensating pole (6) farthest is 16mm-48mm apart from the distance of the second earth electrode (5), and the distance the most nearby apart from the second earth electrode (5) is 2mm-10mm; Microchannel plate (7) is 5mm-15mm apart from compensating pole (6) nearest distance.
7. the device improving velocity of electrons imaging resolution as claimed in claim 6, it is characterized in that, described repeller (2), extract pole (3) for external diameter be 30mm-80mm, thickness is the stainless steel plectane of 1mm-4mm, described repeller (2) plectane center has the circular hole that diameter is 1mm-16mm, and the center of described extraction pole (3) has the circular hole that diameter is 5mm-60mm.
8. the device improving velocity of electrons imaging resolution as claimed in claim 7, it is characterized in that, described first earth electrode (4), the second earth electrode (5) voltage are zero; Repeller (2), extraction pole (3), compensating pole (6) load different voltage according to the size of spacing distance each other and electron energy.
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| CN104795305B (en) * | 2015-03-12 | 2017-10-31 | 华中科技大学 | A kind of method and device for compensating particle rapidity image instrument spherical aberration |
| 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 |
| CN107393805B (en) * | 2017-08-02 | 2019-02-15 | 金华职业技术学院 | Photic isolated device is studied under a kind of low temperature |
| CN108037525B (en) * | 2017-11-29 | 2019-06-07 | 厦门大学 | It is a kind of that the device detected jointly being imaged for mass spectrum and optoelectronic speed |
| CN109001117A (en) * | 2018-08-09 | 2018-12-14 | 金华职业技术学院 | A method of research macroion photoelectron spectrum |
| CN108801922A (en) * | 2018-08-09 | 2018-11-13 | 金华职业技术学院 | A kind of device of research macroion photoelectron spectrum |
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| CN101625326A (en) * | 2009-07-21 | 2010-01-13 | 华东师范大学 | Molecular photodissociation ionization velocity imaging device |
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