CN107144360A - Low-voltage feeble field accelerates the small-sized photolysis debris translational velocity spectrometer of ion imaging formula - Google Patents
Low-voltage feeble field accelerates the small-sized photolysis debris translational velocity spectrometer of ion imaging formula Download PDFInfo
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- 238000006303 photolysis reaction Methods 0.000 title claims abstract description 96
- 230000015843 photosynthesis, light reaction Effects 0.000 title claims abstract description 60
- 238000003384 imaging method Methods 0.000 title claims abstract description 29
- 239000012634 fragment Substances 0.000 claims abstract description 17
- 230000001133 acceleration Effects 0.000 claims description 23
- 230000000694 effects Effects 0.000 claims description 14
- 238000001514 detection method Methods 0.000 claims description 11
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- 238000002604 ultrasonography Methods 0.000 claims 1
- 238000011160 research Methods 0.000 abstract description 7
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- 238000001782 photodegradation Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 15
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- 101100129591 Schizosaccharomyces pombe (strain 972 / ATCC 24843) mcp6 gene Proteins 0.000 description 11
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- 238000005516 engineering process Methods 0.000 description 8
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- 238000001561 resonance enhanced multiphoton ionisation spectroscopy Methods 0.000 description 7
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- 229910052740 iodine Inorganic materials 0.000 description 1
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- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J7/00—Measuring velocity of light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
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Abstract
The small-sized photolysis debris translational velocity spectrometer of ion imaging formula, including source chamber, reative cell, vavuum pump, pulse valve, collimater, laser photolysis and ionization laser, low-voltage feeble field ion is accelerated to accelerate and focusing system, microchannel plate, fluorescent screen, data collecting system, sequential control system and computer the present invention relates to a kind of low-voltage feeble field；The application innovatively accelerates ion to make ion focusing simultaneously with weak electric field (10~30V/cm).The total distance of ion flight is only about 12cm.The present invention enables the short axle of the ion newton ball of stationary state to reach the larger time difference using low-voltage feeble field, and this is very beneficial to subsequent isochronous surface operation.The performances such as the application resolution ratio accelerate better than most of highfields (100~350V/cm) general at present, over long distances the ion imaging formula photodissolved fragment translational energy spectrometer of (38~105cm) flight.The present invention can provide the more accurate, laboratory facilities of more simple and effective for the research of Photodegradation Dynamic.
Description
Technical field
Accelerate the small-sized photolysis debris translational velocity spectrometer of ion imaging formula the present invention relates to a kind of low-voltage feeble field, be related to point
Sub- kinetics technical field.
Background technology
Molecular reaction dynamics is studied the molecule dynamic structure in chemical reaction, reacted on atom, molecular level
Journey, reaction rate and reaction mechanism.Distribution (rate distribution and the angle point of the speed of accurate measurement product molecule in three dimensions
Cloth) be molecular reaction dynamics important research content, can disclose molecular chemical reaction reaction channel, energy distribution, production
The information such as the distribution of thing quantum state and reaction transition state, understands that reaction mechanism and regulation and control chemically react with deep.Prof Lee Yuan-tseh because
Nobel chemistry Prize is obtained using crossed molecular beam Research on experimental methods molecular collision kinetics.
Molecular photodissociation reaction is also known as half crash response, is important monomolecular reaction, is photochemically reactive basis again.
In the research of gas molecule Photodissociation dynamics, the VELOCITY DISTRIBUTION (rate distribution and angle distribution) for measuring photolysis debris is weighed very much
Will, the reaction channel of molecular photodissociation, energy distribution, quantum state distribution, reaction transition state and the reaction of photolysis debris can be obtained
Mechanism.1970, Wilson et al. built up First molecular beam-laser photolysis fragment translation energy disperse spectroscopy (PTS), and detection one is consolidated
Determine the rate distribution of the photolysis debris in direction.Before and after 1981~1985 years, Prof Lee Yuan-tseh laboratory, University of Manchester and in
The academy of sciences of state chemistry institute, successively builds up the changeable photodissolved fragment translational energy spectrometer in molecular beam direction.Above-mentioned photolysis debris
Translation energy disperse spectroscopy can successively measure the photolysis debris rate distribution in different angles, as shown in figure 1, still its is complicated, again
Need ultrahigh vacuum.1987, Chandler and Houston utilized ion imaging technology while measuring the speed of molecular photodissociation fragment
Rate is distributed and angle distribution.Its operation principle be first by a kind of photolysis debris laser ionization into ion, and with highfield accelerate from
Son, then make its free flight, the microchannel plate (MCP) of position sensing is finally flown to, sets fluorescent screen and CCD camera to carry out thereafter
Shooting record.This two-dimensional annular plane picture, can be converted into three-dimensional newton ball, therefore can obtain photodissociation simultaneously with Abel's inverse transformation
The rate distribution of fragment and angle distribution, the apparatus structure are as shown in Figure 2.1997, Eppink and Parker proposed velocity imaging
Concept, when it uses two-stage electric field acceleration, battery lead plate is hollow, is not added with aperture plate, make electrode accelerate ion when also have focus on make
With this significantly improves the spatial discrimination of ion velocity image, and its structure is as shown in figure 3, this technology is promoted.In order to enter
One step improves the resolution of image, and the beginning of this century has using isochronous surface technology (Slicing) again, and direct measurement product ion is formed
Newton ball center section method, this measure, which can be obtained, differentiates higher image.
At home, Dalian Inst of Chemicophysics, Chinese Academy of Sciences, Wuhan physics and Institute of Mathematics, Tsing-Hua University, in
The units such as science and technology university of state, TaiWan, China atom and molecule Science Institute, have ion imaging formula photolysis debris translation
Energy disperse spectroscopy experimental provision.Ion imaging formula PTS accelerates product ion using high voltage (650V~1800V) both at home and abroad at present,
Need by longer flying distance (38~105cm).Built ion imaging formula PTS, much declares speed resolution capability
Δ v/v ≈ 1% can be reached, but from the point of view of the experimental result of document report, only a few experiments spectrogram reaches this index.It is right
In the instrument of measuring speed, stronger extra electric field can be adversely affected to the accuracy of measurement.
The content of the invention
In view of the above-mentioned problems, accelerating ion using low-voltage feeble field it is an object of the invention to provide one kind, and it can improve
The small-sized photolysis debris translational velocity spectrometer of ion imaging formula of measurement accuracy and instrument resolution capability.
To achieve the above object, the present invention takes following technical scheme：A kind of low-voltage feeble field accelerates ion imaging formula small
Type photolysis debris translational velocity spectrometer, it is characterised in that the translational velocity spectrometer includes source chamber, reative cell, vacuum pump system, arteries and veins
Rush valve, collimater, laser photolysis and ionization laser, low-voltage feeble field ion accelerate and focusing system, microchannel plate, fluorescent screen,
Data collecting system, sequential control system and computer；The sequential control system is used to control the pulse valve, laser photolysis
With ionization laser and the sequential of data collecting system；The vacuum pump system is used for the height for maintaining the source chamber and reative cell
Vacuum, the pulse valve is fixedly installed in the source chamber；The pulse valve sprays to sample molecule to be surpassed in the source chamber
Sound is cooled down, and ultrasonic molecular beam is formed after the configured collimating device collimation in the source chamber of sample molecule after cooling and is reached
The reative cell, is made by the ultrasonic molecular beam of supersonic cooling with being arranged on the laser photolysis in photodissociation region and intersecting vertically
A part of molecular photodissociation, a certain selected fragment of photodissociation molecule by the ionization laser resonant enhancing multiphoton ionization formed from
Son, ion is accelerated and two grades of acceleration of focusing system and the detection focused on before the microchannel plate by the low-voltage feeble field ion
Aperture plate, obtains largely having positional information after the electronics that microchannel plate described in ionic bombardment is produced doubles through the microchannel plate
Secondary electron, fluorescent screen described in secondary electron high-speed impact sends fluorescence and is sent to the calculating through the data collecting system
Machine.
Further, if the wavelength of the ionization laser corresponding to sample molecule is just in the photodissociation ripple of the laser photolysis
In long scope, then using the operation for carrying out photodissociation and ionization simultaneously with beam of laser；If the electricity corresponding to sample molecule
From laser wavelength not in the range of the photolysis wavelength of the laser photolysis, then carry out photodissociation and electricity respectively using two beam laser
From the laser photolysis and ionization laser intersect vertically with sample molecule beam respectively.
Further, the low-voltage feeble field ion accelerates and focusing system is with holes but be not added with aperture plate by a series of centers
Metal polar plate is constituted, and the metal polar plate is respectively repeller electrode, accelerates pole and earthing pole, phase between the repeller electrode and acceleration pole
Away from 14.5 millimeters, the acceleration pole is with earthing pole at a distance of 14.5 millimeters, and the repeller electrode center bore is 2 millimeters, described to accelerate
The center bore of pole is 26 millimeters, and the center bore of the earthing pole is 45 millimeters, is connected between the repeller electrode and acceleration pole
One variable resistor, connects a fixed resistance, the voltage between the repeller electrode and acceleration pole between the acceleration pole and earthing pole
The ratio U1/U2 of voltage U2 between U1 and the acceleration pole and earthing pole affects the effect of ion focusing, by adjusting
The resistance of variable resistor is stated to change distribution of the total voltage on U1 and U2, and then affects the focusing effect of ion.
Further, source chamber and the reactor chamber overall size is length 60cm × width 30cm × height 40cm.
Further, the distance of photodissociation point to the microchannel plate is 12cm.
The present invention has advantages below due to taking above technical scheme：
1st, low-voltage feeble field of the invention accelerates the small-sized photolysis debris translational velocity spectrometer (PTS) of ion imaging formula innovatively
Two grades are carried out to molecular fragment ion using weak electric field (10~30V/cm) to accelerate and focus on, due to using low-voltage feeble field adding
Speed, to the fragment ion speed V of detectionCMInterference is small, makes detection accuracy high, and resolution capability is strong, is shown experimentally that the present invention
The speed of photolysis debris ion imaging spectrogram differentiates (Δ v/v) and reaches 1~2%, energy resolution (Δ Et/Et) 2~4% are reached, can
To be studied suitable for small molecule Photodegradation Dynamic.
2nd, the present invention using low-voltage feeble field due to being accelerated, and the distance of ion flight is only about 12cm, therefore experiment cavity is only
There is half of high field speeding scheme or so, volume miniaturization, structure is simplified, and is easy to operation.
3rd, the present invention combines pulse molecular beam technology, laser photolysis technology, laser ionization technology, ion imaging detection skill
The laboratory facilities such as art and isochronous surface Sampling techniques, rate distribution and the angle distribution of molecular photodissociation fragment can be measured simultaneously,
The asymmetric phenomenon of fragment spatial distribution in photolysis is explored beneficial to further, molecular photodissociation state-state reaction is obtained more rich
Information.
4th, the present invention is accelerated using low-voltage feeble field, and realizes the effect of ion focusing, fixed compared with highfield accelerates
The short axle time Δ t of the ion newton ball of state, which has, largely to be increased, and is so more conducive to time pulse sectioning.
In summary, the present invention disclosure satisfy that the parent molecule Photodegradation Dynamic research in ground state or vibration excited state,
In experiment can using single beam (photodissociation photo-ionisation simultaneously), two-beam (photodissociation+photo-ionisation) or three beams (infrared pumping+ultraviolet photolysis+
Ultraviolet light photo from) laser tested, and can provide more accurate, easier, more efficient experiment for the research of Photodegradation Dynamic
Means.
Brief description of the drawings
Fig. 1 is the rotatable photodissolved fragment translational energy spectrometer structural representation of molecular beam of the prior art；
Fig. 2 is ion imaging schematic device of the prior art；
Fig. 3 is the velocity imaging schematic device with ion focusing in the prior art；
The low-voltage feeble field that Fig. 4 is the present invention accelerates the principle of the small-sized photolysis debris translational velocity spectrometer of ion imaging formula to show
It is intended to；
Fig. 5 is that the low-voltage feeble field of the present invention accelerates the system knot of the small-sized photolysis debris translational velocity spectrometer of ion imaging formula
Structure block diagram；
The low-voltage feeble field ion that Fig. 6 is the present invention accelerates and focusing system schematic diagram；
Fig. 7 is the ion focusing effect simulation figure of the present invention；
Fig. 8 is CF of the embodiment of the present invention3Ion imaging schematic diagrames of the I in the excitation state iodine of 277.38nm photodissociation.
Embodiment
Come to carry out the present invention detailed description below in conjunction with accompanying drawing.It should be appreciated, however, that accompanying drawing has been provided only more
Understand the present invention well, they should not be interpreted as limitation of the present invention.
As shown in Figure 4, Figure 5, the low-voltage feeble field that the present invention is provided accelerates the small-sized photolysis debris translation speed of ion imaging formula
Spend spectrometer, including source chamber 1, reative cell 2, vacuum pump system 3, pulse valve 4, collimater 5, MCP (double-deck microchannel plate) 6, fluorescence
Screen 7, data collecting system 8, sequential control system 9 and computer 10, data collecting system can be CCD camera 8.
Vacuum pump system 3 is used for the high vacuum for maintaining source chamber 1 and reative cell 2, and pulse valve 4 is fixed on source chamber 1 with a sleeve
Inwall on, sample molecule sprays into source chamber 1 and because of rapid expanding under the carrier band of carrier gas (such as argon gas or Krypton) from pulse valve 4
And a part for the sample gas after supersonic cooling, supersonic cooling is passed through shape after the aperture of the collimater 5 on the wall of source chamber 1
Enter reative cell 2 into ultrasonic pulse molecular beam.Ultrasonic pulse molecular beam and the ultraviolet photolysis laser beam for being irradiated to photodissociation region
(Photolysis Laser Beam) intersects vertically, and molecule is occurred photodissociation, and a certain selected fragment of photodissociation molecule is same
Beam or another beam Ultra-Violet Laser (REMPI Laser) Resonant-enhanced multiphoton ionization and form ion, ion is through low-voltage feeble field
Ion accelerates and the detection aperture plate before MCP6 is reached after two grades of acceleration of focusing system and focusing, when ion is added by high voltage pulse again
MCP6 is hit after speed, hits and a large amount of secondary electrons with positional information, secondary electrical is obtained after the electronics produced doubles through MCP6
Sub- high-speed impact fluorescent screen 7 sends fluorescence and recorded by CCD camera 8, and detection obtains rate distribution and the angle of molecular photodissociation fragment
Distribution, and it is sent to computer 10.In addition, sequential control system 9 is used to control pulse valve 4, photodissociation Ultra-Violet Laser
Photolysis Laser and photo-ionisation Ultra-Violet Laser REMPI Laser, isochronous surface pulse and CCD camera 8 sequential, make
Photodissociation area can be reached in synchronization by obtaining molecular beam and laser, complete photodissociation and ionization, and image data acquiring.Computer
10 are used to gathering and handling the digital information transmitted through CCD camera 8, and show final image and data.
In a preferred embodiment, supersonic cooling is due to that the internal pressure of pulse valve 4 is more powerful than vacuum source chamber pressure very
Many, the free path of molecule is much smaller than the nozzle diameter of pulse valve 4, and gaseous sample molecule still sharp impacts after ejection make molecule
Speed reaches unanimity, i.e., the random motion decrease in expansion process and directed movement strengthen, and the reduction of random motion causes
The reduction of translation temperature.
In a preferred embodiment, low-voltage feeble field ion accelerate and focusing system be by a series of centers it is with holes but
The metal polar plate composition of aperture plate is not added with, applies different voltages on each metal polar plate, under appropriate plate potential setting, from
Son reaches the initial velocity V of MCP6 position only with ionCMIt is relevant, and it is unrelated with ion initial position, and fragment ion can be produced
Life greatly reduces the ion number density of unit space, efficiently solves space charge effect band in larger spatial dimension
The scalloping problem come, the ion with identical speed can be focused in MCP6 same point.The ion of the present invention accelerates
Worked with focusing system under low-voltage feeble field, simulated first by simion softwares and Polar plates geometric size is optimized,
Confirm under conditions of low-voltage feeble field, ion acceleration system can also reach good focusing effect.
As shown in fig. 6, above-mentioned metal polar plate is respectively repeller electrode E1, accelerates pole E2 and earthing pole E3, repeller electrode E1 is with adding
Fast pole E2 accelerates pole E2 with earthing pole at a distance of 14.5 millimeters at a distance of 14.5 millimeters.The milli of nearly field-free space length 91 after earthing pole E3
Rice.Repeller electrode E1 center bores are 2 millimeters, and it is 26 millimeters to accelerate pole E2 apertures, and earthing pole E3 aperture is 45 millimeters.In repulsion
Total voltage is accessed between pole E1 and earthing pole E3 to accelerate ion, the numerical value of total voltage determines ion newton ball on MCP6
Size, if the excessive MCP that flown out of ion newton ball is, it is necessary to which high voltage shortens ion flight time, if ion newton
Ball is too small, utilization MCP not yet in effect, then needs to reduce voltage to increase ion flight time.
On the other hand, the voltage between voltage U1 and acceleration pole E2 and earthing pole E3 between repeller electrode E1 and acceleration pole E2
U2 ratio U1/U2 affects the effect of ion focusing.A variable resistor R is connected between repeller electrode E1 and acceleration pole E21(0
~3M ohm), accelerate to be connected resistance R between pole E2 and earthing pole E32(3M ohm).By adjusting variable resistor R1Resistance
Value, thus it is possible to vary distribution of the total voltage on U1 and U2, and then affect the focusing effect of ion.It is on repeller electrode E1 plus adjustable
Low-voltage, this accelerates the DC low-voltage of ion, can use dry cell batteries, not only easy but also stably.It is general using voltage (5~
100V), the magnitude of voltage used is decided by the size of laboratory sample molecule and institute's photometric solution molecular fragment translation energy.This voltage ratio shows
The acceleration high voltage (650~1800V) for having imaging type PTS to use is much more convenient, also much more accurate.Adjust variable resistor R1's
Resistance, can change the voltage ratio of two-stage acceleration, can thus adjust with identical VcmThe focus level of the ion of speed, to carry
The definition and resolution ratio of hi-vision.It can be drawn by the simulation of Simion softwares, when total voltage is 45V, R1For 470.5K Europe
During nurse, the focusing effect of ion is best, now, U1/U2=1：6.38, analog result is as shown in Figure 7.
Prior art is generally accelerated using high voltage (650V~1800V) high field to ion, average accelerating field strength one
As in the range of (100~350V/cm), the distance of ion flight is also longer (38cm~105cm).With C.Y.NG seminars 2006
Year develop instrument exemplified by, its repeller electrode E1 and accelerate pole E2 between voltage U1'=378V, accelerate pole E2 and earthing pole E3 it
Between voltage U2'=780V, total voltage reaches 1158V, and the average field-strength of acceleration region is 193V/cm, larger accelerating potential
Cause flying speed very fast, in order to have enough time so that the expansion of ion newton ball to reach the requirement of measurement, must just increase
Plus the distance of ion flight, total distance of its ion flight is 72.5cm, so allows for instrument larger.
In the present invention, repeller electrode E1 and accelerate pole E2 between voltage U1=6.1V, accelerate pole E2 and earthing pole E3 between
Voltage U2=38.9V.The average field-strength of acceleration region is about 15.5V/cm.By simulation, in the comprehensive of two parts electric field
Under cooperation is used, ion has reached preferable focusing effect, and this is first to apply low pressure feeble field in ion to accelerate with gathering in the world
Jiao Shang, and preferable experimental result has been obtained, it is that the miniaturization of instrument is laid a good foundation.
In a preferred embodiment, sequential control system 9 can use digital delay impulse generator such as DG535
And DG645, pulse valve 4 (molecular beam) is controlled respectively, and photodissociation Ultra-Violet Laser Photolysis Laser and/or photo-ionisation are ultraviolet sharp
Sequential between light REMPI Laser and data collecting system 8.Digital delay impulse generator is according to inceptive impulse (T0) definition
The time delay of all trigger assemblies, it is possible to the which arbitrarily time delay of adjustment pulse, i.e. passage A, B, C and D can individually or group
Conjunction is used.Specifically such as digital delay impulse generator DG535 A roads trigger data acquisition system acquisition flight time matter
Spectrum, B roads triggering DG645, C roads triggering xenon lamp of laser, D roads triggering laser Q switch, DG645 A1Road trigger pulse high pressure
Power supply carries out sectioning, B1Road sets high voltage pulse section duration (i.e. slice width), C1Trigger CCD camera work, D1Set
CCD camera exposure time.By adjusting the parameter on each road, molecular beam and laser can be caused while reaching photodissociation area, it is successively complete
Into photodissociation and ionization, and sectioning can be caused just to cut in the middle part of ion newton ball, this is for whole imaging
Experiment is highly beneficial.
In a preferred embodiment, source chamber 1 and the cavity overall size of reative cell 2：Length 60cm × width 30cm ×
Height 40cm, the distance of ion flight is only about 12cm, and experiment cavity only has half of high field speeding scheme or so.
In a preferred embodiment, vacuum pump system 3 includes the first vacuum pump system 31 and the first vacuum pump system
32 are respectively used to maintain source chamber 1 and the high vacuum of reative cell 2.When pulse valve 4 is closed, the vacuum pressure of source chamber 1 is about 5 × 10- 5Pa, the vacuum pressure of reative cell 2 is about 2 × 10-5Pa；When pulse valve 4 is supplied, the vacuum pressure rise of source chamber 1 is a lot, to 5 ×
10-3Pa or higher, the vacuum pressure rise of reative cell 2 is seldom, still about 2 × 10-5Pa。
In a preferred embodiment, because MCP6 needs certain high voltage ability normal work, when using section
When technology is sampled, the voltage applied on MCP6 is made up of two parts：DC voltage and pulse voltage, only when two parts voltage is folded
Added-time, MCP6 can just play the high multiplication effect normal work of electronics.By such design, keep DC voltage normal in an experiment
, when newton ball bosom cut into slices layer segment ion reach MCP6 when, moment unbalanced pulse voltage, can thus measure from
Son greatly improves the resolution capability of detection, here it is sectioning in the distributed image of newton ball center part.The present invention is to figure
As the MCP6 of the detection signals amplified using short time voltage receive working method, to play isochronous surface sampling action.
In a preferred embodiment, using ultraviolet photolysis laser Photolysis Laser by laboratory sample molecule light
Solution, what is obtained is neutral molecular fragment atom or free radical, because it is not easy to detection, it is necessary to be first ionized into ion,
If the scope of this ionization laser REMPI Laser lucky photolysis wavelength in laser photolysis Photolysis Laser of wavelength
It is interior, it can use with a branch of Ultra-Violet Laser while the operation of photodissociation+ionization is carried out, if this ionization laser REMPI Laser ripple
Length does not need two beam Ultra-Violet Lasers to carry out light respectively in the range of laser photolysis Photolysis Laser photolysis wavelength, then
Solution and ionize, Ultra-Violet Laser Photolysis Laser and ionize laser REMPI Laser respectively with sample molecule Shu Chuizhi phases
Hand over, Ultra-Violet Laser Photolysis Laser photodissociation molecules, ionize the photolysis debris of laser REMPI Laser ionized molecules.
In order to examine the low-voltage feeble field of the present invention to accelerate the whole of the small-sized photolysis debris translational velocity spectrometer of ion imaging formula
Body performance, the present invention have studied CF3Photodissociation of the I near 277.38nm, experimental result are as shown in figure 8, can be very straight from Fig. 8
Find out the angular distribution information in this photolysis step with seeing, the shape of newton ball meets typical parallel transition characteristics, while
The loop configuration of different vibrational states can be told, the translational velocity spectrometer of this explanation present invention has higher resolution capability,
Accurate, easy, efficient laboratory facilities can be provided for the research of Photodegradation Dynamic by using the translational velocity spectrometer of the present invention.
The various embodiments described above are merely to illustrate the present invention, wherein the structure of each part, connected mode and manufacture craft etc. are all
It can be varied from, every equivalents carried out on the basis of technical solution of the present invention and improvement should not be excluded
Outside protection scope of the present invention.
Claims (5)
1. a kind of low-voltage feeble field accelerates the small-sized photolysis debris translational velocity spectrometer of ion imaging formula, it is characterised in that the translation
It is weak that velocity spectrograph includes source chamber, reative cell, vacuum pump system, pulse valve, collimater, laser photolysis and ionization laser, low-voltage
Field ion accelerates and focusing system, microchannel plate, fluorescent screen, data collecting system, sequential control system and computer；When described
Sequence control system is used for the sequential for controlling the pulse valve, laser photolysis and ionization laser and data collecting system；
The vacuum pump system is used for the condition of high vacuum degree for maintaining the source chamber and reative cell, and the pulse valve is fixedly installed on described
In source chamber；The pulse valve sprays to sample molecule in the source chamber by supersonic cooling, the sample molecule after cooling it is configured
Ultrasonic molecular beam is formed after the collimating device collimation in the source chamber and reaches the reative cell, by the ultrasound of supersonic cooling
Molecular beam makes a part of molecular photodissociation with being arranged on the laser photolysis in photodissociation region and intersecting vertically, a certain choosing of photodissociation molecule
Determine fragment by it is described ionization laser resonant enhancing multiphoton ionization formation ion, ion by the low-voltage feeble field ion accelerate and
The detection aperture plate that two grades of focusing system accelerates and focused on before the microchannel plate, is produced when microchannel plate described in ionic bombardment
Electronics obtains a large amount of secondary electrons with positional information after doubling through the microchannel plate, glimmering described in secondary electron high-speed impact
Optical screen sends fluorescence and is sent to the computer through the data collecting system.
2. a kind of low-voltage feeble field as claimed in claim 1 accelerates the small-sized photolysis debris translational velocity spectrometer of ion imaging formula,
If characterized in that, the wavelength of the ionization laser corresponding to sample molecule is just in the photolysis wavelength of the laser photolysis
In the range of, then using the operation for carrying out photodissociation and ionization simultaneously with beam of laser；If the ionization corresponding to sample molecule swashs
The wavelength of light then carries out photodissociation and ionization respectively not in the range of the photolysis wavelength of the laser photolysis using two beam laser,
The laser photolysis and ionization laser intersect vertically with sample molecule beam respectively.
3. a kind of low-voltage feeble field as claimed in claim 1 accelerates the small-sized photolysis debris translational velocity spectrometer of ion imaging formula,
Characterized in that, the low-voltage feeble field ion accelerates and focusing system is with holes but be not added with the metal of aperture plate by a series of centers
Pole plate is constituted, and the metal polar plate is respectively repeller electrode, accelerates pole and earthing pole, between the repeller electrode and acceleration pole apart
14.5 millimeters, the acceleration pole is with earthing pole at a distance of 14.5 millimeters, and the repeller electrode center bore is 2 millimeters, the acceleration pole
Center bore be 26 millimeters, the center bore of the earthing pole is 45 millimeters, the repeller electrode and accelerates to connect one between pole
Variable resistor, connects a fixed resistance, the voltage U1 between the repeller electrode and acceleration pole between the acceleration pole and earthing pole
The ratio U1/U2 of voltage U2 between the acceleration pole and earthing pole affects the effect of ion focusing, described by adjustment
The resistance of variable resistor affects the focusing effect of ion to change distribution of the total voltage on U1 and U2.
4. a kind of low-voltage feeble field as described in any one of Claim 1-3 accelerates the small-sized photolysis debris translation of ion imaging formula
Velocity spectrograph, it is characterised in that source chamber and the reactor chamber overall size is length 60cm × width 30cm × height 40cm.
5. a kind of low-voltage feeble field as described in any one of Claim 1-3 accelerates the small-sized photolysis debris translation of ion imaging formula
Velocity spectrograph, it is characterised in that the distance of photodissociation point to the microchannel plate is 12cm.
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