CN107564797B - A method of product after research ionic light excitation - Google Patents
A method of product after research ionic light excitation Download PDFInfo
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Abstract
The present invention relates to photoelectron and molecular reaction dynamics field, a method of product after research ionic light excitation, ion acceleration is after flight time mass spectrum and mass particle selector, into magnetic shielding cover；It is synchronous with laser pulse to carry out ion fragment, generates ion fragment；Focusing electrode group voltage is set as zero, applies voltage in quality selection electrode group, is incremented by the voltage on electrode according to same slope；After ion beam segment is by focusing electrode group, apply impulse electric field in focusing electrode group；After ion leaves quality selection electrode group, voltage in electrode group is selected to be set as zero quality, ion and laser interaction generate fragment ion and photoelectron；Fragment ion flies to focusing electrode group and is reflected, and selects electrode group to fly to ion detector by quality, and the photoelectron generated after ion beam and laser interaction projects, and reaches electron detector after extracting electrode and beam forming electrode acceleration；Reference ion fragment and optoelectronic information.
Description
Technical field
The present invention relates to photoelectronic imaging technology and molecular reaction dynamics fields, especially a kind of to carry out electronics simultaneously
With a kind of research ionic light of fragment ion imaging, the detectivity for having the electronics of instantaneous transmission and the electronics of delay emission
The method of product after excitation.
Background technique
Particle rapidity imaging technique is a kind of important means of molecular reaction dynamics research, and most important feature is can
To obtain the velocity magnitude and directional spreding of the full three-dimensional of scattering particles simultaneously in a width image, it can while obtaining particle
Spectral information and angle distributed intelligence.Particle rapidity imaging technique can be applied in photic separation synchronous experiments, stable state
Molecular anion in electronics photic separation generate dissociation it is known it is interior can neutral intermediate product.By collecting dissociation process
All neutral fragments of middle generation and by using the detector of time and position sensing by neutral fragment and isolated electronics
Relevant information is mapped, then the momentum of relevant product and energy can be computed.
In certain polyatomic anion systems, according to nonadiabatic coupling, electron energy obtained from being excited as light is with it
Vibrational degrees of freedom distribution；When vibrational energy is re-converted into electron energy, electronics is emitted from system, this process phase
It is to have the delay of musec order for light activated process, still, prior art defect is, in most of existing photoelectrons
In spectrum experiment, the relevant experimental data of instant electron emission can only be obtained, can not but detect delay emission electronics and is obtained
Its relevant information, the method for product can solve problem after a kind of research ionic light excitation.
Summary of the invention
To solve the above-mentioned problems, apparatus of the present invention are able to record polyatomic anion system any time after light excitation
The electron emission of the delay of scale has more stable ion boundling and more accurate ion fragment-laser synchronization effect, to protect
Ion concentration with higher is tested in confirmation, and the ion vibrated is overlapping with incident laser pulse more accurate in time.
The technical scheme adopted by the invention is that:
The method of product after a kind of research ionic light excitation, the device of product mainly includes after research ionic light excitation
Ion source, accelerator, flight time mass spectrum, mass particle selector, magnetic shielding cover, ion beam entrance, by electrode I, electrode II,
Electrode III, electrode IV, electrode V composition focusing electrode group, bundling electrode, photoelectricity subexit, by electrode VI, electrode VII, electricity
Pole VIII, electrode IX, electrode X composition quality selection electrode group, ion outlet, ion detector, electronic background reduce plate, anti-
Penetrate plate, ion revision board, extract electrode, beam forming electrode, electron detector, laser, regenerative amplifier, fiber oscillator device,
FPGA, signal generator, optical signal delay cell, electric signal delay cell, meet unit, computer and cable, intermediate ion
18 components of source to electron detector are respectively positioned in ultra-high vacuum environment, the electron detector, electric signal delay cell,
Meet unit, computer successively cable connection, the regenerative amplifier and fiber oscillator device are included in inside the laser, institute
Magnetic shielding cover is stated with the ion beam entrance, photoelectricity subexit and ion outlet, the bundling electrode, reflecting plate, ion are repaired
Positive plate, extraction electrode, beam forming electrode are annular, and the focusing electrode group and quality selection electrode group are annular electro
Pole is in series with resistance, electrode I, electrode II, electrode III, electrode IV, electrode V, electrode VI, electrode VII, electricity between adjacent electrode
Pole VIII, electrode IX, electrode X centre bore be circle, the accelerator includes electrode, ion repeller, withdrawal device and connects
Ground electrode, and have metal mesh attachment, the metal mesh is contacted with withdrawal device and grounding electrode, to generate electrostatic lenses effect
Ying Laiqian meets the focused condition of particle rapidity imaging, and ion beam entrance is coaxial successively pacifies described in face on the outside of the magnetic shielding cover
Equipped with the mass particle selector, flight time mass spectrum, accelerator, ion source, light described in face on the outside of the magnetic shielding cover
Electron exit is coaxial to be sequentially installed with the extraction electrode, beam forming electrode, electron detector, and the ion detector is located at described
On the outside of magnetic shielding cover at ion outlet described in face, the ion detector by cable connection to the electric signal delay cell and
Meet between unit, the optical signal delay cell is located at the laser beam exit of the laser, and the electronic background is reduced
Plate, reflecting plate and ion revision board are located between the focusing electrode group and quality selection electrode group and are sequentially located at the magnetic
In shielding case, the bundling electrode is between the electrode V and ion revision board and coaxial with electrode V centre bore, the collection
Beam electrode, signal generator, FPGA, fiber oscillator device, ion source successively cable connection, only electrode in the focusing electrode group
The hole at the center I has metal mesh, and the focusing electrode group gathers the fragment ion generated after ion and laser interaction
Coke, so that ion meets the focused condition of particle rapidity imaging, the quality selection electricity before reaching the ion detector
The hole of five electrode centers of pole group all has metal mesh, will not significantly affect the vertical component of ion beam speed, the quality
Selection electrode group carries out quality selection to the ion for entering magnetic shielding cover from the ion beam entrance, selects electrode in the quality
Apply a voltage in group, the ion with phase homogenous quantities is enabled to reach some position with the smallest Annual distribution；It adjusts
It is applied to the ratio of voltage in focusing electrode group and quality selection electrode group, Voice segment condition can be reached, and thus improve
Mass spectrographic resolution ratio；The ion detector has hole, and the laser that the laser issues can run through the ion detector
Hole it is incident, spatially laser and ion are had bigger overlapping, later laser beam again from the ion outlet into
Enter magnetic shielding cover, pass through quality selection electrode group and forms laser and ion at the ion revision board overcentre
Interaction zone；The output signal of signal generator is locked in the repetitive rate of laser by the FPGA, signal occurs
Device outputs signal to the bundling electrode, by changing the voltage on bundling electrode, so that in the time for having laser pulse emission
Interior ion beam, by bundling electrode, it is synchronous with laser pulse to carry out ion fragment in the form of ion fragment；Pass through the electricity
The electronic signal broadening delay that signal delay unit obtains electron detector, is believed laser by the optical signal delay cell
Number broadening delay, the electronic signal of neutral particle signal, delay that ion detector obtains, the laser signal of delay are inputted
It is described to meet unit, by it is described meet cell processing after obtain synchro measure signal, the synchro measure signal for trigger one
A digital quantizer, the digital quantizer is when there is the triggering of synchro measure signal, by the signal of the electron detector by amplification
Digitlization, and computer is sent it to, the spectral information and angle distributed intelligence of the electronics of delay transmitting are obtained after analysis,
And thus study the reaction mechanism in photoexcitation process.
The method and step of product after a kind of research ionic light excitation are as follows:
One, ion source generates ion, and applying acceleration voltage on accelerator keeps ion accelerated, and ion passes through flight time matter
After spectrum and the selection of the quality of mass particle selector, enter in magnetic shielding cover from ion beam entrance；
Two, progress ion fragment is synchronous with laser pulse, and the frequency of oscillation 50MHz of fiber oscillator device is divided in advance, divided by
50000 obtained frequencies are the signal of 1000Hz, and to drive regenerative amplifier, the repetitive rate of laser is 1000Hz；It is closed in FPGA
It is the signal of fiber oscillator device frequency 3/5 at frequency, the lockin signal of 30MHz is obtained, by the signal drive signal generator
30.00MHz reference oscillator, so that the output signal of signal generator is locked in the repetitive rate of laser；Signal generator output
Signal changes the voltage on bundling electrode, so that the ion within the time that signal generator has signal to export to bundling electrode
Beam is by bundling electrode, in this way, the optional frequency of 1000 integral multiple of input generator can be automatically in laser weight
Cause ion boundling when the integral multiple of multiple rate, to generate ion fragment；
The voltage of focusing electrode group is set as zero by three, is applied voltage in quality selection electrode group, is made electrode VI, electrode
VII, electrode VIII, electrode IX, the voltage on electrode X are incremented by according to same slope and the voltage on electrode X is higher than and accelerates electrode
On acceleration voltage；
Four, apply impulse electric field in focusing electrode group, make electrode V, electricity after ion beam segment is by focusing electrode group
Pole IV, electrode III, electrode II, voltage is incremented by successively on electrode I, and ion motion is into quality selection electrode group, by reversed electricity
The work of pressure is used as retarded motion and counter motion, so that moving to focusing electrode group；
Quality is selected the voltage in electrode group to be set as zero, then, quilt by five, after ion leaves quality selection electrode group
Forerunner's ion of quality selection electrode group reflection at the ion revision board near interaction zone be irradiated with a laser, ion and
Laser interaction generates fragment ion and photoelectron；
Six, ions and laser interaction and the fragment ion generated flies to focusing electrode group and is reflected, on electrode I
Apply voltage, finally, the fragment ion reflected selects electrode group to fly to ion detector by the quality being grounded；
The photoelectron generated after seven, ion beams and laser interaction is projected from photoelectricity subexit, and by extracting electrode
Electron detector is reached after accelerating with beam forming electrode；
The photoelectronic letter that the information and electron detector for the fragment ion that eight, reference ion detectors obtain obtain
Breath, for carrying out the research of product after ionic light excitation.
The broadening for the electronic signal for being obtained electron detector by the electric signal delay cell postpones 1 microsecond, and leads to
It crosses the optical signal delay cell and sets 1.5 microseconds for laser signal broadening delay, that is, define data acquisition time window,
The synchro measure signal for the measurement in time interval that signal generator has signal to export can be used in analyzing.
Technically it is described as follows:
Reach the detection of delay electronics by electron-neutral synchronous experiments:, will not for the electronics of delay
Generate an individual electronic image similar with the image of instant electronics.Postpone electron emission generally to swash in the photic of anion
Occur in microsecond to millisecond time after hair.During this period of time, anion boundling can select electrode in focusing electrode group and quality
It is vibrated between group.Due to the oscillation back and forth of anion, the velocity component that there is the electronics of transmitting additional both direction to have, this
Sample causes gained image resolution ratio decline.In order to overcome this point, electron-neutral synchronous experiments are used.
Neutral particle is detected by ion detector: since the neutral particle for only having anion to generate has towards ion detection
The speed in device direction, the corresponding electronics for generating the anion transmitting of the above neutral particle only have the speed point in a direction
Amount, i.e., towards ion detector direction, in this way, single electronic image can be obtained from synchronous experiments data.
Anion vibrates between focusing electrode group and quality selection electrode group, has determining kinetic energy, that is, has and determine
Speed, then the flight time that ion moves to ion detector with the neutral particle generated when laser interaction is determining
's.Detect electronics in electron detector and ion detector to detect the time difference of corresponding neutral particle be constant.
Since electron mass is smaller than neutral particle, electronic signal is more early than what the signal of neutral particle occurred, in order to make electricity
The time of signal is detected in sub- detector and ion detector more closely, electronic signal be delayed by with neutral particle signal
Corresponding synchronization.The broadening of electronic signal delays 1 microsecond, determines in photic separation synchronous experiments and acquires neutral particle
Time window, i.e., the neutral particle signal in this period are used for photic separation synchronous experiments.It only is to acquire
In the data of light activating event, laser signal also postpones mutually be overlapped with the electron-neutral synchronization signal in time with delay
It is folded.The laser signal width of delay is set as 1.5 microseconds, i.e. data acquisition time window, the measurement in this time interval
Synchro measure signal be used to analyze.Described in laser signal input by neutral particle signal, the electronic signal of delay, delay
Meet unit, synchro measure signal is having the touching of synchro measure signal for triggering a digital quantizer, this digital quantizer
The signal of the electron detector by amplification is digitized when hair, and sends it to computer.
The beneficial effects of the present invention are:
The present invention can carry out electronics and fragment ion imaging simultaneously, have the electronics of instantaneous transmission and the electricity of delay emission
The detectivity of son has more stable ion boundling and more accurate ion fragment-laser synchronization effect, to guarantee experiment tool
There are higher ion concentration and the ion of oscillation overlapping with incident laser pulse more accurate in time.
Detailed description of the invention
It is further illustrated below with reference to figure of the invention:
Fig. 1 is schematic structural view of the invention.
In figure, 1. ion sources, 2. accelerators, 3. flight time mass spectrums, 4. mass particle selectors, 5. magnetic shielding covers, 6.
Ion beam entrance, 7. focusing electrode groups, 7-1. electrode I, 7-2. electrode II, 7-3. electrode III, 7-4. electrode IV, 7-5. electrode
V, 8. bundling electrodes, 9. photoelectricity subexits, 10. mass select electrode group, 10-1. electrode VI, 10-2. electrode VII, 10-3. electricity
Pole VIII, 10-4. electrode IX, 10-5. electrode X, 11. ion outlets, 12. ion detectors, 13. electronic backgrounds reduction plate, 14.
Reflecting plate, 15. ion revision boards, 16. extract electrode, 17. beam forming electrodes, 18. electron detectors, 19. lasers, 20. regeneration
Amplifier, 21. fiber oscillator devices, 22.FPGA, 23. signal generators, 24. optical signal delay cells, the delay of 25. electric signals are single
Member, 26. meet unit, 27. computers.
Specific embodiment
If Fig. 1 is schematic structural view of the invention, device mainly includes ion source (1), accelerator (2), flight time mass spectrum
(3), mass particle selector (4), magnetic shielding cover (5), ion beam entrance (6), by electrode I (7-1), electrode II (7-2), electrode
III (7-3), electrode IV (7-4), electrode V (7-5) composition focusing electrode group (7), bundling electrode (8), photoelectricity subexit (9),
The matter being made of electrode VI (10-1), electrode VII (10-2), electrode VIII (10-3), electrode IX (10-4), electrode X (10-5)
Amount selection electrode group (10), ion outlet (11), ion detector (12), electronic background reduce plate (13), reflecting plate (14), from
Sub- revision board (15) extracts electrode (16), beam forming electrode (17), electron detector (18), laser (19), regenerative amplifier
(20), fiber oscillator device (21), FPGA (22), signal generator (23), optical signal delay cell (24), electric signal delay cell
(25), meet unit (26), computer (27) and cable, wherein 18 components of ion source (1) to electron detector (18)
It is respectively positioned in ultra-high vacuum environment, the electron detector (18), electric signal delay cell (25) meet unit (26), calculate
Successively cable connection, the regenerative amplifier (20) and fiber oscillator device (21) are included in the laser (19) machine (27)
Portion, the magnetic shielding cover (5) have the ion beam entrance (6), photoelectricity subexit (9) and ion outlet (11), the boundling
Electrode (8), reflecting plate (14), ion revision board (15), extraction electrode (16), beam forming electrode (17) are annular, the focusing
Electrode group (7) and quality selection electrode group (10) are annular electrode, and resistance, electrode I (7- are in series between adjacent electrode
1), electrode II (7-2), electrode III (7-3), electrode IV (7-4), electrode V (7-5), electrode VI (10-1), electrode VII (10-
2), electrode VIII (10-3), electrode IX (10-4), electrode X (10-5) centre bore be circle, the accelerator (2) includes
Electrode, ion repeller, withdrawal device and grounding electrode, and have metal mesh attachment, the metal mesh and withdrawal device and ground connection electricity
Pole is contact, and to generate the focused condition for meeting particle rapidity imaging before electrostatic lenses effect is come, the magnetic shielding cover (5) is outside
Ion beam entrance (6) described in the face of side is coaxial to be sequentially installed with the mass particle selector (4), flight time mass spectrum (3), adds
Fast device (2), ion source (1), on the outside of the magnetic shielding cover (5) photoelectricity subexit (9) described in face it is coaxial be sequentially installed with it is described
Electrode (16), beam forming electrode (17), electron detector (18) are extracted, the ion detector (12) is located at the magnetic shielding cover
(5) at ion outlet (11) described in the face of outside, the ion detector (12) is postponed single by cable connection to the electric signal
First (25) and meet between unit (26), the optical signal delay cell (24) is located at the laser beam exit of the laser (19)
Place, the electronic background reduce plate (13), reflecting plate (14) and ion revision board (15) and are located at the focusing electrode group (7) and matter
It is sequentially located between amount selection electrode group (10) and in the magnetic shielding cover (5), the bundling electrode (8) is located at the electrode
Between V (7-5) and ion revision board (15) and coaxial with electrode V (7-5) centre bore, the bundling electrode (8), signal occur
Device (23), FPGA (22), fiber oscillator device (21), ion source (1) successively cable connection, in the focusing electrode group (7) only
The hole at the center electrode I (7-1) has a metal mesh, the focusing electrode group (7) to generated after ion and laser interaction from
Sub- fragment is focused, so that ion meets the focusing item of particle rapidity imaging before reaching the ion detector (12)
The hole of part, five electrode centers of quality selection electrode group (10) all has metal mesh, will not significantly affect ion beam speed
The vertical component of degree, quality selection electrode group (10) is to the ion for entering magnetic shielding cover (5) from the ion beam entrance (6)
Carry out quality selection, apply a voltage in quality selection electrode group (10), enable to have phase homogenous quantities from
Son reaches some position with the smallest Annual distribution；Adjusting is applied in focusing electrode group (7) and quality selection electrode group (10)
The ratio of voltage can reach Voice segment condition, and thus improve mass spectrographic resolution ratio；The ion detector (12) has
Hole, the laser that the laser (19) issues can be through the hole incidences of the ion detector (12), so that spatially swashing
Light and ion can have bigger overlapping, and laser beam enters magnetic shielding cover (5) from the ion outlet (11) again, passes through institute later
It states quality selection electrode group (10) and forms the interaction of laser and ion at ion revision board (15) overcentre
Region；The output signal of signal generator (23) is locked in the repetitive rate of laser, signal generator by the FPGA (22)
(23) bundling electrode (8) are outputed signal to, by changing the voltage on bundling electrode (8), so that there is laser pulse hair
It is synchronous with laser pulse to carry out ion fragment by bundling electrode in the form of ion fragment for ion beam in the time penetrated；It is logical
The electronic signal broadening delay that the electric signal delay cell (25) obtains electron detector (18) is crossed, the optical signal is passed through
Delay cell (24), which broadens laser signal, to be postponed, the electronics of neutral particle signal, delay that ion detector (18) is obtained
Signal, delay laser signal input described in meet unit (26), by it is described meet unit (26) processing after synchronized
Measuring signal, the synchro measure signal are having the touching of synchro measure signal for triggering a digital quantizer, the digital quantizer
When hair, the signal of the electron detector by amplification is digitized, and send it to computer (27), obtained after analysis
Postpone the spectral information and angle distributed intelligence of the electronics of transmitting, and thus studies the reaction mechanism in photoexcitation process.
The method and step of product after a kind of research ionic light excitation are as follows:
One, ion source (1) generates ion, and applying acceleration voltage on accelerator (2) keeps ion accelerated, and ion is by flight
After the selection of the quality of time mass spectrum (3) and mass particle selector (4), enter in magnetic shielding cover (5) from ion beam entrance (6)；
Two, progress ion fragment is synchronous with laser pulse, and the frequency of oscillation 50MHz of fiber oscillator device (21) is divided in advance,
The frequency obtained divided by 50000 is the signal of 1000Hz, and to drive regenerative amplifier (20), the repetitive rate of laser is 1000Hz；
Frequency synthesis is the signal of fiber oscillator device frequency 3/5 in FPGA (22), obtains the lockin signal of 30MHz, which is driven
The 30.00MHz reference oscillator of signal generator (23), so that the output signal of signal generator (23) is locked in the weight of laser
Multiple rate；Signal generator outputs signal to bundling electrode (8), changes the voltage on bundling electrode (8), so that in signal generator
(23) ion beam in time for having signal to export is by bundling electrode (8), in this way, 1000 integer of input generator
Optional frequency again automatically can cause ion boundling in the integral multiple of laser repetition rate, to generate ion fragment；
The voltage of focusing electrode group (7) is set as zero by three, is applied voltage in quality selection electrode group (10), is made electrode VI
(10-1), electrode VII (10-2), electrode VIII (10-3), electrode IX (10-4), the voltage on electrode X (10-5) are according to same
Slope is incremented by and the voltage on electrode X is higher than the acceleration voltage accelerated on electrode；
Four, apply impulse electric field on focusing electrode group (7), make electricity after ion beam segment is by focusing electrode group (7)
Pole V (7-5), electrode IV (7-4), electrode III (7-3), electrode II (7-2), voltage is incremented by successively on electrode I (7-1), ion fortune
It moves into quality selection electrode group (10), the work by backward voltage is used as retarded motion and counter motion, so as to electricity is focused
Pole group (7) movement；
Five, select the voltage on electrode group (10) to be set as zero after ion leaves quality selection electrode group (10), by quality,
Then, the forerunner's ion reflected by quality selection electrode group (10) at ion revision board (15) near interaction zone quilt
Laser irradiation, ion and laser interaction generate fragment ion and photoelectron；
Six, ions and laser interaction and the fragment ion generated flies to focusing electrode group (7) and is reflected, in electrode
Apply voltage on I (7-1), finally, the fragment ion reflected flies to ion spy by quality selection electrode group (10) of ground connection
It surveys device (12)；
The photoelectron generated after seven, ion beams and laser interaction is projected from photoelectricity subexit (9), and by extracting electricity
Pole (16) and beam forming electrode (17) reach electron detector (18) after accelerating；
The photoelectricity that the information and electron detector (18) for the fragment ion that eight, reference ion detectors (12) obtain obtain
The information of son, for carrying out the research of product after ionic light excitation.
It is micro- that the broadening for the electronic signal for being obtained electron detector (18) by the electric signal delay cell (25) postpones 1
Second, and 1.5 microseconds are set for laser signal broadening delay by the optical signal delay cell (24), that is, it defines data and adopts
Collect time window, the synchro measure signal for the measurement in time interval that signal generator (23) has signal to export can be used in point
Analysis.
Technically it is described as follows:
Reach the detection of delay electronics by electron-neutral synchronous experiments:, will not for the electronics of delay
Generate an individual electronic image similar with the image of instant electronics.Postpone electron emission generally to swash in the photic of anion
Occur in microsecond to millisecond time after hair.During this period of time, anion boundling can be in focusing electrode group (7) and quality selection electricity
Pole group vibrates between (10).Due to the oscillation back and forth of anion, the speed that there is additional both direction to have for the electronics of transmitting
Component, in this way, causing gained image resolution ratio decline.In order to overcome this point, it is real to use electron-neutral synchro measure
It tests.
Neutral particle is detected by ion detector (12): since the neutral particle for only having anion to generate has towards ion
The speed in detector (12) direction, the corresponding electronics for generating the anion transmitting of the above neutral particle only have a direction
Velocity component, i.e., towards ion detector (12) direction, in this way, single electricity can be obtained from synchronous experiments data
Subgraph.
Anion vibrates between focusing electrode group (7) and quality selection electrode group (10), has determining kinetic energy, that is, has
There is determining speed, then when ion moves to the flight of ion detector (12) with the neutral particle generated when laser interaction
Between be determining.Electronics is detected in electron detector (18) and ion detector (12) detects corresponding neutral particle
Time difference is constant.
Since electron mass is smaller than neutral particle, electronic signal is more early than what the signal of neutral particle occurred, in order to make electricity
The time of signal is detected in sub- detector (18) and ion detector (12) more closely, electronic signal be delayed by with neutrality
The corresponding synchronization of particle signal.The broadening of electronic signal delays 1 microsecond, determines and acquires in photic separation synchronous experiments
Neutral particle time window, i.e., the neutral particle signal in this period are used for photic separation synchronous experiments.In order to adopt
Collect and only be from the data of light activating event, laser signal also postpones synchronous with the electron-neutral in time with delay
Signal overlaps.The laser signal width of delay is set as 1.5 microseconds, i.e. data acquisition time window, in this time interval
The synchro measure signal of interior measurement be used to analyze.By neutral particle signal, the electronic signal of delay, delay laser signal
Meet unit described in input, synchro measure signal is having same pacing for triggering a digital quantizer, this digital quantizer
The signal of the electron detector (18) by amplification is digitized when measuring signal triggering, and sends it to computer (27).
Claims (2)
1. a kind of method of product after research ionic light excitation, the device of product mainly includes ion source after research ionic light excitation
(1), accelerator (2), flight time mass spectrum (3), mass particle selector (4), magnetic shielding cover (5), ion beam entrance (6), by
The focusing electrode group of electrode I (7-1), electrode II (7-2), electrode III (7-3), electrode IV (7-4), electrode V (7-5) composition
(7), bundling electrode (8), photoelectricity subexit (9), by electrode VI (10-1), electrode VII (10-2), electrode VIII (10-3), electricity
Quality selection electrode group (10) of pole IX (10-4), electrode X (10-5) composition, ion outlet (11), ion detector (12), electricity
Sub- background reduces plate (13), reflecting plate (14), ion revision board (15), extracts electrode (16), beam forming electrode (17), electron detection
Device (18), laser (19), regenerative amplifier (20), fiber oscillator device (21), FPGA (22), signal generator (23), light letter
Number delay cell (24), electric signal delay cell (25) meet unit (26), computer (27) and cable, wherein ion source (1)
18 components to electron detector (18) are respectively positioned in ultra-high vacuum environment, and the electron detector (18), electric signal prolong
Slow unit (25) meets unit (26), computer (27) successively cable connection, the regenerative amplifier (20) and fiber oscillator device
(21) it is included in the laser (19) inside, the magnetic shielding cover (5) has the ion beam entrance (6), photoelectricity subexit
(9) and ion outlet (11), the bundling electrode (8), ion revision board (15), extract electrode (16), pack at reflecting plate (14)
Electrode (17) is annular, and the focusing electrode group (7) and quality selection electrode group (10) are annular electrode, adjacent electricity
Be in series with resistance between pole, electrode I (7-1), electrode II (7-2), electrode III (7-3), electrode IV (7-4), electrode V (7-5),
Electrode VI (10-1), electrode VII (10-2), electrode VIII (10-3), electrode IX (10-4), the centre bore of electrode X (10-5) are equal
For circle, the accelerator (2) includes electrode, ion repeller, withdrawal device and grounding electrode, and has metal mesh attachment, institute
It states metal mesh to contact with withdrawal device and grounding electrode, meets the poly- of particle rapidity imaging before electrostatic lenses effect is come to generate
Burnt condition, ion beam entrance (6) is coaxial is sequentially installed with the mass particle selection described in face on the outside of the magnetic shielding cover (5)
Device (4), flight time mass spectrum (3), accelerator (2), ion source (1), photoelectron described in face goes out on the outside of the magnetic shielding cover (5)
Mouthful (9) are coaxial is sequentially installed with the extraction electrode (16), beam forming electrode (17), electron detector (18), the ion detection
Device (12) is located on the outside of the magnetic shielding cover (5) at ion outlet (11) described in face, and the ion detector (12) is by cable
It is connected to the electric signal delay cell (25) and meets between unit (26), the optical signal delay cell (24) is located at described
At the laser beam exit of laser (19), the electronic background reduces plate (13), reflecting plate (14) and ion revision board (15) position
It selects between electrode group (10) and to be sequentially located in the magnetic shielding cover (5) in the focusing electrode group (7) and quality, it is described
Bundling electrode (8) is between the electrode V (7-5) and ion revision board (15) and coaxial with electrode V (7-5) centre bore, institute
State bundling electrode (8), signal generator (23), FPGA (22), fiber oscillator device (21), ion source (1) successively cable connection, institute
Stating the hole for only having the center electrode I (7-1) in focusing electrode group (7) has metal mesh, and the focusing electrode group (7) is to ion and swashs
The fragment ion generated after light interaction is focused, so that ion meets grain before reaching the ion detector (12)
The hole of the focused condition of sub- velocity imaging, five electrode centers of quality selection electrode group (10) all has metal mesh, no
Can significantly affect the vertical component of ion beam speed, quality selection electrode group (10) to from the ion beam entrance (6) into
The ion for entering magnetic shielding cover (5) carries out quality selection, applies a voltage in quality selection electrode group (10), can make
There must be the ion of phase homogenous quantities to reach some position with the smallest Annual distribution；Adjusting is applied to focusing electrode group (7) and matter
The ratio of voltage, can reach Voice segment condition, and thus improve mass spectrographic resolution ratio in amount selection electrode group (10)；It is described
Ion detector (12) has hole, and the laser that the laser (19) issues can enter through the hole of the ion detector (12)
It penetrates, spatially laser and ion is had bigger overlapping, laser beam enters from the ion outlet (11) again later
Magnetic shielding cover (5) passes through quality selection electrode group (10) and is formed at ion revision board (15) overcentre sharp
The interaction zone of light and ion；The output signal of signal generator (23) is locked in laser by the FPGA (22)
Repetitive rate, signal generator (23) output signal to the bundling electrode (8), by changing the voltage on bundling electrode (8), make
It obtains the ion beam within the time for having laser pulse emission and passes through bundling electrode in the form of ion fragment, carry out ion fragment and swash
The synchronization of light pulse；The electronic signal broadening that electron detector (18) obtains is prolonged by the electric signal delay cell (25)
Late, laser signal is broadened by the optical signal delay cell (24) and is postponed, the neutral grain that ion detector (18) is obtained
Subsignal, the electronic signal of delay, delay laser signal input described in meet unit (26), meet unit by described
(26) synchro measure signal is obtained after handling, the synchro measure signal is for triggering a digital quantizer, the digital quantizer
When there is the triggering of synchro measure signal, the signal of the electron detector by amplification is digitized, and send it to computer
(27), the spectral information and angle distributed intelligence of the electronics of delay transmitting are obtained after analysis, and thus study photoexcitation process
In reaction mechanism,
It is characterized in that: a kind of method and step for studying product after ionic light excites are as follows:
One, ion source (1) generates ion, and applying acceleration voltage on accelerator (2) keeps ion accelerated, and ion passes through the flight time
After the selection of the quality of mass spectrum (3) and mass particle selector (4), enter in magnetic shielding cover (5) from ion beam entrance (6)；
Two, progress ion fragment is synchronous with laser pulse, and the frequency of oscillation 50MHz of fiber oscillator device (21) is divided in advance, divided by
50000 obtained frequencies are the signal of 1000Hz, and to drive regenerative amplifier (20), the repetitive rate of laser is 1000Hz；FPGA
(22) frequency synthesis is the signal of fiber oscillator device frequency 3/5 in, the lockin signal of 30MHz is obtained, by the signal drive signal
The 30.00MHz reference oscillator of generator (23), so that the output signal of signal generator (23) is locked in the repetition of laser
Rate；Signal generator outputs signal to bundling electrode (8), changes the voltage on bundling electrode (8), so that in signal generator
(23) ion beam in time for having signal to export is by bundling electrode (8), in this way, 1000 integer of input generator
Optional frequency again automatically can cause ion boundling in the integral multiple of laser repetition rate, to generate ion fragment；
The voltage of focusing electrode group (7) is set as zero by three, is applied voltage in quality selection electrode group (10), is made electrode VI (10-
1), electrode VII (10-2), electrode VIII (10-3), electrode IX (10-4), the voltage on electrode X (10-5) are according to same slope
It is incremented by and the voltage on electrode X is higher than the acceleration voltage accelerated on electrode；
Four, apply impulse electric field on focusing electrode group (7), make electrode V after ion beam segment is by focusing electrode group (7)
(7-5), electrode IV (7-4), electrode III (7-3), electrode II (7-2), voltage is incremented by successively on electrode I (7-1), ion motion
Into quality selection electrode group (10), the work by backward voltage is used as retarded motion and counter motion, so as to focusing electrode
Group (7) movement；
Five, select the voltage on electrode group (10) to be set as zero after ion leaves quality selection electrode group (10), by quality, connect
, by forerunner's ion that quality selection electrode group (10) is reflected at ion revision board (15) near interaction zone swashed
Light irradiation, ion and laser interaction generate fragment ion and photoelectron；
Six, ions and laser interaction and the fragment ion generated flies to focusing electrode group (7) and is reflected, in electrode I (7-
1) apply voltage on, finally, the fragment ion reflected flies to ion detector by quality selection electrode group (10) of ground connection
(12)；
The photoelectron generated after seven, ion beams and laser interaction is projected from photoelectricity subexit (9), and by extracting electrode
(16) and after beam forming electrode (17) acceleration electron detector (18) are reached；
The information and electron detector (18) for the fragment ion that eight, reference ion detectors (12) obtain obtain photoelectronic
Information, for carrying out the research of product after ionic light excitation.
2. the method for product after a kind of research ionic light excitation according to claim 1, it is characterized in that: passing through the telecommunications
The broadening for the electronic signal that number delay cell (25) obtains electron detector (18) postpones 1 microsecond, and passes through the optical signal
Laser signal broadening delay is set 1.5 microseconds by delay cell (24), that is, defines data acquisition time window, and signal occurs
The synchro measure signal for the measurement in time interval that device (23) has signal to export can be used in analyzing.
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