CN107144360B - 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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- 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 present invention relates to a kind of low-voltage feeble fields to accelerate the small-sized photolysis debris translational velocity spectrometer of ion imaging formula, including source chamber, reaction chamber, vacuum pump, pulse valve, collimator, laser photolysis and ionization laser, low-voltage feeble field ion acceleration and focusing system, microchannel plate, fluorescent screen, data collection system, sequential control system and computer；The application innovatively uses weak electric field (10~30V/cm) to accelerate ion while making ion focusing.Ion flight total distance is only about 12cm.The present invention enables the short axle of the ion newton ball of stationary state to reach the biggish time difference using low-voltage feeble field, this is very beneficial to subsequent isochronous surface operation.The performances such as the application resolution ratio accelerate better than most of strong electrical fields (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 more accurate, more simple and effective laboratory facilities for the research of Photodegradation Dynamic.
Description
Technical field
The present invention relates to a kind of low-voltage feeble fields to accelerate the small-sized photolysis debris translational velocity spectrometer of ion imaging formula, is related to point
Sub- kinetics technical field.
Background technique
Molecular reaction dynamics is studied the molecule dynamic structure in chemical reaction, was reacted on atom, molecular level
Journey, reaction rate and reaction mechanism.Distribution (rate distribution and the angle point of the speed of precise measurement product molecule in three dimensions
Cloth) be molecular reaction dynamics important research content, can disclose molecular chemical reaction reaction channel, energy distribution, produce
The information such as the distribution of object quantum state and reaction transition state understand reaction mechanism and regulation chemical reaction 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, and be photochemically reactive basis.?
In the research of gas molecule Photodissociation dynamics, the VELOCITY DISTRIBUTION (rate distribution and angle distribution) for measuring photolysis debris is very heavy
It wants, reaction channel, the energy distribution, quantum state distribution, reaction transition state and the reaction of photolysis debris of molecular photodissociation 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 solid
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, 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 angle, as shown in Figure 1, still its structure is complicated, again
Need ultrahigh vacuum.1987, Chandler and Houston utilized ion imaging technology while measuring the speed of molecular photodissociation fragment
Rate distribution and angle distribution.Its working principle is that first by a kind of photolysis debris laser ionization at ion, and with strong electrical field accelerate from
Son, then make its free flight, the microchannel plate (MCP) of position sensing is finally flown to, fluorescent screen is set thereafter and CCD camera carries out
Camera shooting record.This two-dimensional annular flat image can be converted into three-dimensional newton ball with Abel's inverse transformation, therefore can simultaneously obtain photodissociation
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 using two-stage electric field acceleration, electrode plate is hollow, and aperture plate is not added, make electrode accelerate ion when also have focusing make
With this significantly improves the spatial discrimination of ion velocity image, and structure is as shown in figure 3, this technology is promoted.In order into
One step improves the resolution of image, and the beginning of this century has again using isochronous surface technology (Slicing), directly measures product ion and is formed
Newton ball middle section method, this measure, which can get, differentiates higher image.
At home, Dalian Inst of Chemicophysics, Chinese Academy of Sciences, Wuhan physics and Institute of Mathematics, Tsinghua University, in
The units such as science and technology university, state, TaiWan, China atom and molecule Science Institute have the translation of ion imaging formula photolysis debris
Energy disperse spectroscopy experimental provision.Ion imaging formula PTS uses high voltage (650V~1800V) to accelerate product ion both at home and abroad at present,
It needs 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 experimental result reported in the literature, only a few experiments spectrogram reaches this index.It is right
In the instrument of measuring speed, stronger extra electric field can adversely affect the accuracy of measurement.
Summary of the invention
In view of the above-mentioned problems, accelerating ion using low-voltage feeble field the object of the present invention is to provide a kind of, and can be improved
The small-sized photolysis debris translational velocity spectrometer of the 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 acceleration ion imaging formula is small
Type photolysis debris translational velocity spectrometer, which is characterized in that the translational velocity spectrometer includes source chamber, reaction chamber, vacuum pump system, arteries and veins
Rush valve, collimator, laser photolysis and ionization laser, low-voltage feeble field ion acceleration and focusing system, microchannel plate, fluorescent screen,
Data collection system, sequential control system and computer；The sequential control system is for controlling the pulse valve, laser photolysis
With the timing of ionization laser and data collection system；The vacuum pump system is used to maintain the height of the source chamber and reaction chamber
Vacuum degree, the pulse valve are fixed in the source chamber；The pulse valve, which sprays to sample molecule in the source chamber, to be surpassed
Sound is cooling, and sample molecule after cooling, which is set, forms ultrasonic molecular beam arrival after the indoor collimator collimation in the source
The reaction chamber, being intersected vertically by the ultrasonic molecular beam of supersonic cooling with the laser photolysis that photodissociation region is arranged in makes
A part of molecular photodissociation, a certain selected fragment of photodissociation molecule by ionization laser resonant enhancing multiphoton ionization formed from
Son, ion are accelerated by the low-voltage feeble field ion acceleration and focusing system second level and focus on the detection before the microchannel plate
Aperture plate obtains largely having location information after microchannel plate multiplication when ion hits the electronics that the microchannel plate generates
Secondary electron, fluorescent screen described in secondary electron high-speed impact issues fluorescence and is sent to the calculating through the data collection system
Machine.
Further, if the wavelength of the ionization laser corresponding to sample molecule is just in the photodissociation wave of the laser photolysis
In long range, then using the operation for carrying out photodissociation and ionization simultaneously with beam of laser；If the electricity corresponding to sample molecule
From the wavelength of laser not in the range of the photolysis wavelength of the laser photolysis, then photodissociation and electricity are carried out 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 acceleration and focusing system are with holes by a series of centers but aperture plate are not added
Metal polar plate composition, the metal polar plate are respectively repeller electrode, accelerate pole and earthing pole, phase between the repeller electrode and acceleration pole
Away from 14.5 millimeters, the acceleration pole and earthing pole are at a distance of 14.5 millimeters, and the repeller electrode center bore is 2 millimeters, the acceleration
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 resistance connects a fixed resistance, the voltage between the repeller electrode and acceleration pole between acceleration pole and the earthing pole
The U1 and ratio U1/U2 for accelerating the voltage U2 between pole and earthing pole affects the effect of ion focusing, by adjusting institute
The resistance value of variable resistance is stated to change distribution of the total voltage on U1 and U2, and then affects the focusing effect of ion.
Further, the source chamber and reactor chamber overall size are length 60cm × width 30cm × height 40cm.
Further, the distance of photodissociation point to the microchannel plate is 12cm.
The present invention has the advantage that due to taking above technical scheme
1, low-voltage feeble field of the invention accelerates the small-sized photolysis debris translational velocity spectrometer (PTS) of ion imaging formula innovatively
Second level acceleration and focusing are carried out to molecular fragment ion using weak electric field (10~30V/cm), due to using low-voltage feeble field to add
Speed, to the fragment ion speed V of detectionCMIt interferes small, makes to detect that accuracy is 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) reach 2~4%, it can
It is studied with being suitable for small molecule Photodegradation Dynamic.
2, for the present invention due to being accelerated using low-voltage feeble field, the distance of ion flight is only about 12cm, therefore tests cavity only
There is the half or so of high field speeding scheme, volume miniaturization, structure is simplified, convenient for operation.
3, the present invention combines pulse molecular beam technology, laser photolysis technology, laser ionization technology, ion imaging to detect skill
The laboratory facilities such as art and isochronous surface sampling technique can measure the rate distribution and angle distribution of molecular photodissociation fragment simultaneously,
The asymmetric phenomenon of fragment spatial distribution in photolysis is explored conducive to further, it is richer to obtain molecular photodissociation state-state reaction
Information.
4, the present invention is accelerated using low-voltage feeble field, and realizes the effect of ion focusing, fixed compared with strong electrical field accelerates
The short axle time Δ t of the ion newton ball of state, which has, largely to be increased, and is more conducive to time pulse sectioning in this way.
It is studied in conclusion the present invention can satisfy in the parent molecule Photodegradation Dynamic of 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, more accurate, easier, more efficient experiment can be provided for the research of Photodegradation Dynamic
Means.
Detailed description of the invention
Fig. 1 is the rotatable photodissolved fragment translational energy spectrometer structural schematic diagram of molecular beam in the prior art；
Fig. 2 is ion imaging schematic device in the prior art；
Fig. 3 is the velocity imaging schematic device with ion focusing in the prior art；
Fig. 4 is that low-voltage feeble field of the 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 the system knot that low-voltage feeble field of the invention accelerates the small-sized photolysis debris translational velocity spectrometer of ion imaging formula
Structure block diagram；
Fig. 6 is low-voltage feeble field ion acceleration and focusing system schematic diagram of the invention；
Fig. 7 is ion focusing effect simulation figure of the invention；
Fig. 8 is CF of the embodiment of the present invention3Ion imaging schematic diagram of the I in the excitation state iodine of 277.38nm photodissociation.
Specific embodiment
Come to carry out detailed description to the present invention below in conjunction with attached drawing.It should be appreciated, however, that attached 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, low-voltage feeble field provided by the invention accelerates the small-sized photolysis debris translation speed of ion imaging formula
Spend spectrometer, including source chamber 1, reaction chamber 2, vacuum pump system 3, pulse valve 4, collimator 5, MCP (the double-deck microchannel plate) 6, fluorescence
Screen 7, data collection system 8, sequential control system 9 and computer 10, data collection system can be CCD camera 8.
Vacuum pump system 3 is used to maintain the high vacuum of source chamber 1 and reaction chamber 2, and pulse valve 4 is fixed on source chamber 1 with a sleeve
Inner wall on, sample molecule sprays into source chamber 1 and because of rapid expanding from pulse valve 4 under the carrier band of carrier gas (such as argon gas or Krypton)
And supersonic cooling, a part of the sample gas after supersonic cooling are passed through shape after the aperture of the collimator 5 on 1 wall of source chamber
Enter reaction chamber 2 at 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 makes molecule that photodissociation occur, and a certain selected fragment of photodissociation molecule is same
Beam or another beam ultraviolet laser (REMPI Laser) Resonant-enhanced multiphoton ionization and form ion, ion is through low-voltage feeble field
Ion acceleration and focusing system second level accelerate and reach after focusing the detection aperture plate before MCP6, when ion is added by high voltage pulse again
MCP6 is hit after speed, the electronics for hitting generation obtains the secondary electron largely with location information, secondary electrical after MCP6 doubles
Sub- high-speed impact fluorescent screen 7 issues fluorescence and is 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 for controlling pulse valve 4, photodissociation ultraviolet laser
The timing of Photolysis Laser and photo-ionisation ultraviolet laser REMPI Laser, isochronous surface pulse and CCD camera 8, make
Photodissociation area can be reached in synchronization by obtaining molecular beam and laser, complete photodissociation and ionization and image data acquiring.Computer
10 for acquiring and handling the digital information transmitted through CCD camera 8, and shows final image and data.
In a preferred embodiment, supersonic cooling is since 4 internal pressure of pulse valve is more powerful than vacuum source chamber pressure very
More, the free path of molecule is much smaller than 4 nozzle diameter of pulse valve, 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 enhance, and the reduction of random motion causes
The reduction for the temperature that is translatable.
In a preferred embodiment, low-voltage feeble field ion acceleration and focusing system be it is with holes by a series of centers but
The metal polar plate composition of aperture plate is not added, applies different voltage on each metal polar plate, under plate potential appropriate setting, from
Son reaches initial velocity V of the position of MCP6 with ionCMIt is related, and it is unrelated with ion initial position, and fragment ion can produce
Life greatly reduces the ion number density of unit space, efficiently solves space charge effect band in biggish spatial dimension
The scalloping problem come, the ion with identical speed can focus in the same point of MCP6.Ion acceleration of the invention
It works under low-voltage feeble field with focusing system, is simulated first by simion software and Polar plates geometric size is optimized,
It confirms 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, acceleration pole E2 and earthing pole E3, repeller electrode E1 and adds
Fast pole E2 accelerates pole E2 and earthing pole at a distance of 14.5 millimeters at a distance of 14.5 millimeters.Long 91 milli of nearly field-free space after earthing pole E3
Rice.Repeller electrode E1 center bore is 2 millimeters, and accelerating the aperture pole E2 is 26 millimeters, and the aperture of earthing pole E3 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, needs high voltage to shorten ion flight time, if ion newton
Ball is too small, not yet in effect to utilize MCP, then needs to reduce voltage to increase ion flight time.
On the other hand, the voltage between the voltage U1 between repeller electrode E1 and acceleration pole E2 and acceleration pole E2 and earthing pole E3
The ratio U1/U2 of U2 affects the effect of ion focusing.In repeller electrode E1 and accelerate to connect a variable resistance R between the E2 of pole1(0
~3M ohm), accelerate to be connected and fixed resistance R between pole E2 and earthing pole E32(3M ohm).By adjusting variable resistance 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, dry cell batteries can be used, not only easy but also stable.Generally using voltage (5~
100V), the voltage value used is decided by the size of laboratory sample molecule and institute's photometric solution molecular fragment translation energy.This voltage is than existing
The acceleration high voltage (650~1800V) for having imaging type PTS to use wants much more convenient, also much more accurate.Adjust variable resistance R1's
The voltage ratio that two-stage accelerates can be changed in resistance value, thus adjustable to have identical VcmThe focus level of the ion of speed, to mention
The clarity and resolution ratio of hi-vision.Simulated by Simion software it can be concluded that, when total voltage be 45V, R1For the Europe 470.5K
When nurse, the focusing effect of ion is best, at this point, U1/U2=1:6.38, analog result is as shown in Figure 7.
The prior art generallys use high voltage (650V~1800V) high field and accelerates to ion, average acceleration field strength one
As in (100~350V/cm) range, the distance of ion flight is also longer (38cm~105cm).With C.Y.NG seminar 2006
Year develop instrument for, 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, biggish acceleration voltage
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
Add the distance of ion flight, the total distance of ion flight is 72.5cm, and it is larger to allow for instrument in this way.
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 simulating it is found that in the comprehensive of two parts electric field
Under cooperation is used, ion has reached preferable focusing effect, this is that low pressure feeble field is applied in ion acceleration and gathered for the first time in the world
Jiao Shang, and preferable experimental result has been obtained, it lays a good foundation for the miniaturization of instrument.
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, photodissociation ultraviolet laser Photolysis Laser and/or photo-ionisation are ultraviolet sharp
Timing between light REMPI Laser and data collection system 8.Digital delay impulse generator is according to inceptive impulse (T0) definition
The delay time of all trigger assemblies, and can arbitrarily adjust the delay time of pulse, i.e. channel A, B, C and D can independent or group
It closes and uses.The specifically road the A trigger data acquisition system acquisition flight time matter of such as digital delay impulse generator DG535
DG645 is triggered on spectrum, the road B, and xenon lamp of laser is triggered on the road C, and laser Q switch, the A of DG645 are triggered in the road D1Road trigger pulse high pressure
Power supply carries out sectioning, B1Road is arranged high voltage pulse and is sliced duration (i.e. slice width), C1Trigger CCD camera work, D1Setting
CCD camera exposure time.By the parameter on each road of adjusting, molecular beam and laser can be made while reaching photodissociation area, it is successively complete
At photodissociation and ionization, and sectioning can be made just to cut in the middle part of ion newton ball, this is for being entirely imaged
Experiment is highly beneficial.
In a preferred embodiment, the cavity overall size of source chamber 1 and reaction chamber 2: length 60cm × width 30cm ×
Height 40cm, the distance of ion flight are only about 12cm, and experiment cavity only has the half or so of high field speeding scheme.
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 the high vacuum of source chamber 1 and reaction chamber 2.When pulse valve 4 is closed, the vacuum pressure of source chamber 1 is about 5 × 10- 5Pa, the vacuum pressure of reaction chamber 2 are about 2 × 10-5Pa；When pulse valve 4 supplies, the vacuum pressure of source chamber 1 increase it is very much, to 5 ×
10-3The vacuum pressure of Pa or higher, reaction chamber 2 increase seldom, still about 2 × 10-5Pa。
In a preferred embodiment, since MCP6 needs certain high voltage that could work normally, when using slice
When technology samples, the voltage applied on MCP6 is made 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 of electronics and work normally.Design in this way keeps DC voltage normal in an experiment
, when newton ball bosom slicing layer part ion reach MCP6 when, moment unbalanced pulse voltage, can thus measure from
Son greatly improves the resolution capability of detection, here it is sectionings in the distributed image of newton ball center part.The present invention is to figure
As the signal reception working method that the MCP6 of detection is amplified using short time voltage, 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 that neutral molecular fragment atom or free radical need first to be ionized into ion since it is not easy to detect,
If the wavelength of this ionization laser REMPI Laser is just in the range of the photolysis wavelength of laser photolysis Photolysis Laser
It is interior, it can be used with a branch of ultraviolet laser while carrying out photodissociation+ionization operation, if the wave of this ionization laser REMPI Laser
Length then needs two beam ultraviolet lasers to carry out light respectively not in the range of the photolysis wavelength of laser photolysis Photolysis Laser
Solution and ionization, ultraviolet laser Photolysis Laser and ionize laser REMPI Laser respectively with sample molecule Shu Chuizhi phase
It hands over, ultraviolet laser Photolysis Laser photodissociation molecule, ionizes the photolysis debris of laser REMPI Laser ionized molecule.
In order to examine low-voltage feeble field of the 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 results are shown in figure 8, can be very straight from Fig. 8
Find out that the angular distribution information in this photolysis step, the shape of newton ball meet typical parallel transition characteristics with seeing, while
The ring structure of different vibrational states can be told, this illustrates translational velocity spectrometer of the invention resolution capability with higher,
Use translational velocity spectrometer of the invention that can provide accurate, easy, efficient laboratory facilities for the research of Photodegradation Dynamic.
The various embodiments described above are merely to illustrate the present invention, wherein the structure of each component, connection type and manufacture craft etc. are all
It can be varied, all equivalents and improvement carried out based on the technical solution of the present invention should not exclude
Except protection scope of the present invention.
Claims (4)
1. a kind of low-voltage feeble field accelerates the small-sized photolysis debris translational velocity spectrometer of ion imaging formula, which is characterized in that the translation
Velocity spectrograph includes that source chamber, reaction chamber, vacuum pump system, pulse valve, collimator, laser photolysis and ionization laser, low-voltage are weak
Field ion accelerates and focusing system, microchannel plate, fluorescent screen, data collection system, sequential control system and computer；When described
Sequence control system is used to control the timing of the pulse valve, laser photolysis and ionization laser and data collection system；
The vacuum pump system is used to maintain the condition of high vacuum degree of the source chamber and reaction chamber, and the pulse valve is fixed at described
In source chamber；The pulse valve sprays to sample molecule by supersonic cooling in the source chamber, and sample molecule after cooling is set
Ultrasonic molecular beam is formed after the indoor collimator collimation in source and reaches the reaction chamber, by the ultrasound of supersonic cooling
Molecular beam and the laser photolysis that photodissociation region is arranged in intersect vertically and make a part of molecular photodissociation, a certain choosing of photodissociation molecule
Determine fragment and ion formed by ionization laser resonant enhancing multiphoton ionization, ion by the low-voltage feeble field ion acceleration and
Focusing system second level accelerates and focuses on the detection aperture plate before the microchannel plate, when ion hits what the microchannel plate generated
Electronics obtains secondary electrons largely with location information after microchannel plate multiplication, glimmering described in secondary electron high-speed impact
Optical screen issues fluorescence and is sent to the computer through the data collection system；
The low-voltage feeble field ion acceleration and focusing system are a series of metal polar plate groups with holes by centers but that aperture plate is not added
At the metal polar plate is respectively repeller electrode, accelerates pole and earthing pole, at a distance of 14.5 millis between the repeller electrode and acceleration pole
At a distance of 14.5 millimeters, the repeller electrode center bore is 2 millimeters for rice, the acceleration pole and earthing pole, the center for accelerating pole
Aperture is 26 millimeters, and the center bore of the earthing pole is 45 millimeters, and connection one can power transformation between the repeller electrode and acceleration pole
Resistance, connects a fixed resistance between accelerations pole and the earthing pole, the voltage U1 between the repeller electrode and acceleration pole with it is described
Accelerate the ratio U1/U2 of the voltage U2 between pole and earthing pole to affect the effect of ion focusing, by adjusting it is described can power transformation
The resistance value of resistance affects the focusing effect of ion to change distribution of the total voltage on U1 and U2.
2. a kind of low-voltage feeble field as described in claim 1 accelerates the small-sized photolysis debris translational velocity spectrometer of ion imaging formula,
It is characterized in that, if the wavelength of the ionization laser corresponding to sample molecule is just in the photolysis wavelength of the laser photolysis
In range, 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 using two beam laser not in the range of the photolysis wavelength of the laser photolysis respectively,
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 or 2 accelerates the small-sized photolysis debris translational velocity spectrum of ion imaging formula
Instrument, which is characterized in that the source chamber and reactor chamber overall size are length 60cm × width 30cm × height 40cm.
4. a kind of low-voltage feeble field as claimed in claim 1 or 2 accelerates the small-sized photolysis debris translational velocity spectrum of ion imaging formula
Instrument, which is characterized in that the distance of photodissociation point to the microchannel plate is 12cm.
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