CN101752175B - Molecular photodissociation and photoionization based on quantum coherent control and device thereof - Google Patents
Molecular photodissociation and photoionization based on quantum coherent control and device thereof Download PDFInfo
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- CN101752175B CN101752175B CN2009102010100A CN200910201010A CN101752175B CN 101752175 B CN101752175 B CN 101752175B CN 2009102010100 A CN2009102010100 A CN 2009102010100A CN 200910201010 A CN200910201010 A CN 200910201010A CN 101752175 B CN101752175 B CN 101752175B
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Abstract
The present invention discloses molecular photodissociation and photoionization method based on quantum coherent control and a device thereof. The present invention is characterized in that: the method uses ion-velocity imaging to collect the mass spectrum and the three-dimensional spatial distribution information of positive and negative ions and electron as the feedback control signals of a quantum coherent control system. The device comprises a synchronous laser, a blazed grating, a spatial light modulator, a vacuum cavity, an ion lens set, a microchannel plate and a computer. The invention combines a quantum coherent control technique with an ion-velocity imaging technique, uses the information, such as velocity distribution, angular distribution, energy distribution and the like, obtained by an ion-velocity imaging system as the feedback control signals of a quantum coherent control system, is capable of changing the strength ratios of different ions by optimizing laser pulse and the branching ratios of different reaction channels of the same ion signal, and greatly improves the precision and efficiency of the quantum coherent control.
Description
Technical field
The present invention relates to the molecular reaction dynamics technical field, specifically a kind of molecular photodissociation of controlling based on quantum coherent is from photo-ionisation method and device thereof.
Background technology
Since the seventies in 20th century, molecular photodissociation dynamics becomes an important branch of research molecular reaction dynamics.Photodissociation dynamics is not only studied the interaction of monomer molecule and laser, and is the control bimolecular, even the important means of polymolecular system chemical reaction.From eighties of last century the mid-90, the ion velocity imaging technique becomes the dynamic (dynamical) major technique means of research molecular photodissociation gradually.The ion velocity imaging technique is on the basis of traditional time-of-flight mass spectrometry instrument (TOF-MS), introduce the ion lens technology, with diverse location in the space but the identical particle of speed focus on the same point of microchannel plate (MCP), carry out imaging with strengthening CCD camera (ICCD) again, just can obtain the Energy distribution of different particles in reaction by the gained image being carried out mathematical analysis, angular distribution and VELOCITY DISTRIBUTION, and then be finally inversed by molecule and the interactional physical image of femto-second laser pulse.
Eighties of last century eighties, Brumer and Shapiro propose the thought of quantum coherent control for the first time, just experimental results show that up to the nineties in 20th century.Entered since 21 century, ultrafast femtosecond laser is widely used, and the quantum coherent control technology has all played important effect at the aspects such as generation of control chemical reaction, high field laser ionization, high order harmonic component and chirped pulse.By controlling the phase place and the amplitude of femtosecond laser different spectral composition, the quantum coherent control technology can be to the population of molecular photodissociation different excited state particle numbers in process, the output of molecule photodissociation, the branching ratio of the same compound ionization and the passage that dissociates and control with the selection of the differential responses direction of a part.
Summary of the invention
A kind of molecular photodissociation of controlling based on quantum coherent that the objective of the invention is to provide at the deficiencies in the prior art is from photo-ionisation method and device thereof, it combines the quantum coherent control technology with the ion velocity imaging technique, VELOCITY DISTRIBUTION with ion velocity imaging gained, angular distribution, information such as Energy distribution are as the feedback signal of quantum coherent control, by optimizing laser pulse, change the strength ratio of different ions, and the different excitation state of selecting the same ion signal of population, improved the control precision and the efficient of quantum coherent control greatly.
The concrete technical scheme that realizes the object of the invention is: a kind of molecular photodissociation based on quantum coherent control is from the method for photo ionization, be characterized in that this method carries out inverting to the ion velocity slice image that femto-second laser pulse and matter interaction obtain, to obtain the channel branch ratio, the ionizing efficiency of dissociating, angular distribution, VELOCITY DISTRIBUTION, the Energy distribution parameter, then these parameters are fed back to the femto-second laser pulse shaping by the close-loop feedback control program based on genetic algorithm, utilize femto-second laser pulse and interaction of molecules after the shaping, change the branching ratio between the different products, or select the different excitation state of same product to carry out population, the reaction channel that selective exitation is different, accurate control with quantum coherent realizes the selection of molecular reaction passage is improved molecular photodissociation from ionization, and the molecular photodissociation of its quantum coherent control may further comprise the steps from the method for photo ionization:
(a) laser pulse
Centre wavelength is 800nm, and the synchronous femtosecond laser of pulsewidth 50fs enters the femto-second laser pulse shaping;
(b) molecular photodissociation is from photo ionization
Femto-second laser pulse after the shaping and molecular beam interact, the photodissociation photo ionization takes place, the different kinds of ions that produces flies to microchannel plate under the effect of ion lens group, produce the ion velocity slice image on fluorescent plate, by strengthening the CCD camera its image is taken;
(c) sectioning image inverting
The ion velocity slice image is carried out inverting, obtain VELOCITY DISTRIBUTION, angular distribution, parameters such as Energy distribution;
(d) based on the close-loop feedback control of genetic algorithm
Parameter is fed back to the femto-second laser pulse shaping by the close-loop feedback control program based on genetic algorithm, utilize femto-second laser pulse and interaction of molecules after the shaping, change the branching ratio between the different products, or select the different excitation state of same product to carry out population, with the different reaction channel of selective exitation.
A kind of molecular photodissociation of controlling based on quantum coherent is from the photo ionization device, be characterized in that this device is by the femto-second laser pulse orthopedic systems, molecular photodissociation is from the photo ionization system, data acquisition and software systems are formed, molecular photodissociation carries out slice imaging from the photo ionization system with the ion that femto-second laser pulse and matter interaction obtain, image processing program in the operating software system is handled the ion velocity slice image, obtain VELOCITY DISTRIBUTION, angular distribution, the Energy distribution parameter, then these parameters are handled by data acquisition and software systems and fed back to the femto-second laser pulse orthopedic systems, to optimize the strength ratio and different product branching ratios that laser pulse changes different ions, or different excitation state in the same product of selection population, with different reaction channel in the same product of selective exitation, realize the accurate control of molecular photodissociation quantum coherent in ionization;
The femto-second laser pulse orthopedic systems is made up of synchronous femtosecond laser, first balzed grating,, first concave mirror, spatial light modulator, second concave mirror and second balzed grating,, spatial light modulator is arranged between first concave mirror and second concave mirror, first balzed grating, and the corresponding in twos setting of first concave mirror, second concave mirror and the corresponding in twos setting of second balzed grating,, the light path that makes femtosecond laser is on same horizontal plane;
Molecular photodissociation from the photo ionization system by inert gas source, sample cell, vacuum cavity, the dried pump of prime, molecular pump, the two-dimensional adjustment dish is formed, vacuum cavity is last, two cylindrical cavities are inverted "T"-shaped setting down, and two cylindrical cavity axis normal, be provided with the pulse valve that connects the pulse power in the last cylindrical cavity, the below of pulse valve is provided with strainer, be provided with first pole plate that connects first high-voltage DC power supply in the following cylindrical cavity, second pole plate, tri-electrode, the drift utmost point pole plate group of quadripolar plate and ground connection, the side of following cylindrical cavity is provided with the microchannel plate that connects second high-voltage DC power supply, the fluorescent plate that connects the 3rd high-voltage DC power supply, fluorescent plate outside correspondence is provided with and strengthens the CCD camera, photomultiplier, last cylindrical cavity top is provided with the two-dimensional adjustment dish, the one side is provided with the dried pump of prime, molecular pump, following cylindrical cavity is provided with the dried pump of another prime, molecular pump, sample cell is connected with pulse valve through the two-dimensional adjustment dish by the second carrier gas pipe, and sample cell is connected with inert gas source by the first carrier gas pipe;
Data acquisition and software systems are made up of enhancing CCD camera, photomultiplier, computer, data collecting card, and computer is connected with spatial light modulator, enhancing CCD camera respectively, and data collecting card is connected with photomultiplier.
Described spatial light modulator is combined by two liquid crystal boards, is arranged on the focal plane of first concave mirror, the laser pulse of each frequency content is carried out the modulation of phase place and amplitude or pure phase position.
Described strainer and the coaxial setting of pulse valve, and the center between first pole plate and second pole plate.
Described two-dimensional adjustment dish is orthogonal two adjustable screw bars, and the position of fine setting pulse valve makes the center interaction of synchronous laser between first pole plate and second pole plate after pulse molecular beam and the modulation.
Described drift utmost point pole plate group is made up of the stainless steel plectane that the several piece center that connects successively is provided with circular hole, along cylindrical cavity axis setting down.
Ion lens group and microchannel plate, the coaxial setting of fluorescent plate that described first pole plate, second pole plate, tri-electrode, quadripolar plate and drift utmost point pole plate group constitute.
Described data collecting card is binary channels sampling, high sampling rate 2GS/s, 8 vertical resolutions, Memory256MB.
It is integrated that described computer is provided with the software of the close-loop feedback control program, open loop ACTIVE CONTROL program and the image processing program that comprise based on genetic algorithm.
The present invention compared with prior art has precision and the efficient that has improved quantum coherent control greatly, it develops the single argument of traditional fluorescence intensity, ionization signal and intensity and is the multivariable FEEDBACK CONTROL of channel branch ratio, the ionizing efficiency of dissociating, angular distribution, VELOCITY DISTRIBUTION, Energy distribution, accurate record to VELOCITY DISTRIBUTION, angular distribution and Energy distribution in molecule and the laser pulse interaction process, the precision of processes of molecular reactions controlled realizing, to be selected different reaction channel in the branching ratio of different products or the same product.
Description of drawings
Fig. 1 is a structural representation of the present invention
Fig. 2 is an operational flowchart of the present invention
Embodiment
Consult accompanying drawing 1, the present invention is by femto-second laser pulse orthopedic systems 34, molecular photodissociation is from photo ionization system 35, data acquisition and software systems 33 are formed, molecular photodissociation carries out slice imaging from photo ionization system 35 with the ion that femto-second laser pulse and matter interaction obtain, image processing program in service data collection and the software systems 33 carries out inverting to the ion velocity slice image, obtain VELOCITY DISTRIBUTION, angular distribution, the Energy distribution parameter, handle by data acquisition and software systems 33 by these parameters then and feed back to femto-second laser pulse orthopedic systems 34, to optimize laser pulse, change the strength ratio of different ions and the branching ratio between the different product, or select the different excitation state of same ion signal to carry out population, with the different reaction channel of selective exitation, realize the accurate control of molecular photodissociation quantum coherent in ionization.
Above-mentioned femto-second laser pulse orthopedic systems 34 is made up of synchronous femtosecond laser 1, first balzed grating, 2, first concave mirror 3, spatial light modulator 4, second concave mirror 5 and second balzed grating, 6, spatial light modulator 4 is arranged between first concave mirror 3 and second concave mirror 5, first balzed grating, 2 and the corresponding in twos setting of first concave mirror 3, second concave mirror 5 and the corresponding in twos setting of second balzed grating, 6, the light path that makes femtosecond laser is on same horizontal plane.
Above-mentioned molecular photodissociation is made up of inert gas source 7, sample cell 10, vacuum cavity 12, the dried pump 13 of prime, molecular pump 14, two-dimensional adjustment dish 30 from photo ionization system 35, vacuum cavity 12 is inverted "T"-shaped setting for upper and lower two cylindrical cavities 37,38, and two cylindrical cavity axis normal; Be provided with the pulse valve 15 that connects the pulse power 24 in the last cylindrical cavity 37, the below of pulse valve 15 is provided with strainer 16; Be provided with the drift utmost point pole plate group 21 of first pole plate 17, second pole plate 18, tri-electrode 19, quadripolar plate 20 and the ground connection that connect first high-voltage DC power supply 25 in the following cylindrical cavity 38, constitute the ion lens group by first pole plate 17, second pole plate 18, tri-electrode 19, quadripolar plate 20 and drift utmost point pole plate group 21, the side of following cylindrical cavity 38 is provided with the microchannel plate 22 that connects second high-voltage DC power supply 26, the fluorescent plate 23 that connects the 3rd high-voltage DC power supply 27; Microchannel plate 22 is forward and backward arrangement setting with fluorescent plate 23, is provided with in fluorescent plate 23 outside correspondences to strengthen CCD camera (ICCD) 28, photomultiplier (PMT) 29.Last cylindrical cavity 37 tops are provided with two-dimensional adjustment dish 30, and the one side is provided with the dried pump 13 of prime, molecular pump 14; Following cylindrical cavity 38 is provided with the dried pump 13 of another prime, molecular pump 14; Sample cell 10 is connected with pulse valve 15 through two-dimensional adjustment dish 30 by the second carrier gas pipe 11, sample cell 10 is connected with inert gas source 7 by the first carrier gas pipe 9, the first carrier gas pipe 9 is connected under the liquid level with sample cell 10, and the second carrier gas pipe 11 is connected on the liquid level with sample cell 10.
Above-mentioned data acquisition and software systems 33 are by strengthening CCD camera (ICCD) 28, photomultiplier (PMT) 29, computer 31, data collecting card 32 is formed, computer 31 respectively with spatial light modulator 4, strengthening CCD camera (ICCD) 28 connects, data collecting card 32 is connected with photomultiplier (PMT) 29, computer 31 is provided with the close-loop feedback control program that comprises based on genetic algorithm, the software of open loop ACTIVE CONTROL program and image processing program is integrated, data collecting card 32 is the binary channels sampling, high sampling rate 2GS/s, 8 vertical resolutions, Memory 256MB.
Above-mentioned spatial light modulator 4 is by two forward and backward being arranged in a combination of liquid crystal board, spatial light modulator 4 is arranged on the focal plane of first concave mirror 3, every liquid crystal board is made up of 128 liquid crystal cell, and apply voltage independently for each liquid crystal cell by computer 31, the transmittance of different frequency is through different liquid crystal cell, different variations takes place in its propagation rate, thereby influences the phase place and the amplitude of incident laser pulse.
Above-mentioned strainer 16 and pulse valve 15 coaxial settings, and the center between first pole plate 17 and second pole plate 18.
Above-mentioned two-dimensional adjustment dish 30 is orthogonal two adjustable screw bars, and the position of fine-tuning pulse valve 15 makes the center interaction of synchronous laser between first pole plate 17 and second pole plate 18 after pulse molecular beam and the modulation.
Above-mentioned drift utmost point pole plate group 21 is made up of the stainless steel plectane that the several piece center that connects successively is provided with circular hole, along the axis setting of last cylindrical cavity 37.
The above-mentioned ion lens group and microchannel plate 22, fluorescent plate 23 coaxial settings that constitutes by first pole plate 17, second pole plate 18, tri-electrode 19, quadripolar plate 20 and drift utmost point pole plate group 21.
Consult accompanying drawing 1, accompanying drawing 2, the present invention is work like this:
(1), laser pulse
Centre wavelength is 800nm, the synchronous femtosecond laser 1 of pulsewidth 50fs enters femto-second laser pulse orthopedic systems 34, first balzed grating, 2 is opened each frequency content chromatic dispersion spatially of laser pulse, the laser pulse that first concave mirror 3 is opened chromatic dispersion focuses on its focal plane, convert the angle dispersion of grating on the concave mirror focal plane apart, incident laser pulse is transformed into frequency domain by time domain, finishes the Fourier conversion.Spatial light modulator 4 is placed on the focal plane of first concave mirror 3, by computer 31 by self-editing close-loop feedback control program based on genetic algorithm, voltage file output is loaded on each liquid crystal cell of spatial light modulator 4, the laser pulse of each frequency content is carried out phase modulated and amplitude modulation(PAM).Second concave mirror 5 focuses on the laser pulse of modulating once more, carries out contrary Fourier conversion, makes laser pulse be transformed into time domain by frequency domain, and second balzed grating, 6 spatially merges each frequency content laser again, obtains the laser pulse after the shaping.
(2), photodissociation photo ionization
Laser pulse after the shaping enters molecular photodissociation and guarantees that from the operation of dried pump 13 of photo ionization system 35, two primes and two molecular pumps 14 vacuum degree of vacuum cavity 12 is 10
-6More than the mbar, the gas of inert gas source 7 enters sample cell 10 through after the decompression of pressure-reducing valve 8 by the first carrier gas pipe 9, in the sample cell 10 is the testing liquid sample, when the first carrier gas pipe 9 below being positioned at liquid level is emitted gas, the testing sample of part vaporization is carried out and deliver to pulse valve 15 by the second carrier gas pipe 11, after the calibration through two-dimensional adjustment dish 30, the ultrasonic molecular beam of pulse valve 15 ejections will fly to the centre position of first pole plate 17 and second pole plate 18 behind strainer 16 collimations, the ultrasonic molecular beam of synchronous laser after the shaping and pulse valve 15 ejections interacts, dissociate, ionization, dissociating, the different kinds of ions that produces in the ionization process flies to microchannel plate 22 under the effect of ion lens group, and on fluorescent plate 23, produce image, strengthening CCD camera (ICCD) 28 takes the image on the fluorescent plate 23, the same position of the ion incidence that different spatial but speed are identical in the ion cluster to the microchannel plate 22 simultaneously, regulate the sweep interval and the scanning gate-width that strengthen CCD camera (ICCD) 28, will gather the sectioning image information of different ions signal behind the image integration on the fluorescent plate 23 one by one by capture card 32.
(3), sectioning image inverting
Utilize self-editing image processing program that the ion sectioning image that enhancing CCD camera (ICCD) 28 couples photographs is carried out inverting, obtain VELOCITY DISTRIBUTION, angular distribution, information such as Energy distribution, as the image that strengthens the ion X that CCD camera (ICCD) 28 photographs has 3 rings, ion X just has three different dissociation channels so, we can say that also ion X has 3 different excitation state, the VELOCITY DISTRIBUTION that inverting is come out is as shown in accompanying drawing 2, this VELOCITY DISTRIBUTION contains a, b, three peaks of c, this a, b, c represents different dissociation channel of this ion and different excitation state respectively in three peaks.
(4), based on the close-loop feedback control program of genetic algorithm
Operation is based on the close-loop feedback control program of genetic algorithm, target criteria is the ratio (c/b) of c peak and the intensity at b peak in the velocity contour shown in the accompanying drawing 2, the ratio that also can be described as with the c excited state particle population number of ion X and b excited state particle population number is a target criteria, and laser pulse is carried out shaping:
(i) one group of initial value of picked at random is loaded on the liquid crystal array of spatial light modulator 4 by computer 31 outputs, thereby each spectrum component of laser pulse is carried out phase place and amplitude modulation(PAM).
(ii), differentiate the quality of each initial value, choose some initial values and remain as operand according to target criteria.
(iii) the initial value that keeps is carried out sequence of operations (intersecting or be called hybridization, make a variation or be called sudden change) and obtain value of future generation, be loaded into once more on the array of spatial light modulator 4 each liquid crystal cell by computer 31 output, each spectrum component of laser pulse is carried out phase place and amplitude modulation(PAM).
(iv), differentiate the quality of the value of a new generation once more according to target criteria.
(v) if current generation value meets the demands or evolutionary process reaches certain algebraically, calculate and finish, otherwise again by the (iii) step proceed.
(vi) when finally reaching the requiring of target criteria, the intensity at c peak is enhanced in the velocity contour shown in the accompanying drawing 2, and the intensity at b peak is cut down, also can be described as, c excited state particle population number is optimized, and b excited state particle population number reduces, and can also say so, ion X dissociate or ionization process with choice reaction passage c, and choice reaction passage b not.
Workflow of the present invention is: centre wavelength is 800nm, after the synchronous femtosecond laser 1 of pulsewidth 50fs enters femto-second laser pulse orthopedic systems 34, by first balzed grating, 2 each frequency content chromatic dispersion spatially of laser pulse is opened; The laser pulse that first concave mirror 3 is opened chromatic dispersion focuses on its focal plane, converts the angle dispersion of grating on the concave mirror focal plane apart, and incident laser pulse is transformed into frequency domain by time domain, finishes the Fourier conversion; Spatial light modulator 4 is placed on the focal plane of first concave mirror, by computer 31 voltage file output is loaded on the liquid crystal board of spatial light modulator 4, and the laser pulse of each frequency content is carried out phase place and amplitude modulation(PAM); Second concave mirror 5 focuses on the laser pulse of modulating once more, carries out contrary Fourier conversion, makes laser pulse be transformed into time domain by frequency domain; Second balzed grating, 6 spatially merges each frequency content laser again, obtains the laser pulse after the shaping.Through after the effect of femtosecond laser, COULOMB EXPLOSION will take place molecule in the molecular beam or the ionization of dissociating is ion, ion or electronics for opposed polarity, first pole plate 17, second pole plate 18, tri-electrode 19 will load different positive high voltages or negative high voltage respectively with quadripolar plate 20, guarantee different spatial in the ion cluster but the identical ion incidence of speed to the same position of microchannel plate 22.Because the length of flight cavity is about 1m, ion cluster will be stretched to the hundreds of scope of a nanosecond, can carry out the experiment of two aspects this moment:
First kind, the fragment ion of different charge-mass ratios successively impacts on the channel plate 22 according to time sequencing, photomultiplier 29 is gathered and is sent in the data collecting card 32 after with the mass spectrum information on the fluorescent plate 23 one by one, obtain the mass spectrum information of different ions by its subsidiary capture program, move close-loop feedback control program then based on genetic algorithm, select two different ions fragment (a, b), their ratio (a/b) of intensity is made as target criteria, makes a certain amount of ions increase or reduce even disappear.Also can move the open loop control program, pre-set a certain function (such as: sine, square wave, warble etc.), change a certain parameter in the function within the specific limits, generate a series of voltage files, the voltage file of producing is in advance exported one by one by computer 31, be loaded on the liquid crystal array of spatial light modulator 4, each spectrum component of laser pulse is carried out phase place and amplitude modulation(PAM), obtain the variation tendency of the charge-mass ratio of each ion with laser light field.
Second kind, the identical fragment ion of different spatial but speed is on the same position that impacts under the ion lens group effect that is made of first pole plate 17, second pole plate 18, tri-electrode 19, quadripolar plate 20 and drift utmost point pole plate group 21 on the microchannel plate 22, regulate the sweep interval and the scanning gate-width that strengthen CCD camera (ICCD) 28, will gather one by one behind the image integration on the fluorescent plate 23.So just obtained the sectioning image information of different ions signal,, just can obtain the VELOCITY DISTRIBUTION of each ion, parameters such as angular distribution and Energy distribution by the analysis of image processing program to these images.Operation is based on the close-loop feedback control program of genetic algorithm, with the particle population number of two different excitation state of a certain ion ratio be target criteria, different excitation state to ion are selected population, carry out selective exitation with different dissociation channels, material is dissociated or ionization via our specific dissociation channel ion.Also can move the open loop control program, pre-set a certain function (such as: sine, square wave, warble etc.), change a certain parameter in the function within the specific limits, generate a series of voltage files; The voltage file of producing is in advance exported one by one by computer 31, be loaded on the liquid crystal array of spatial light modulator 4, each spectrum component to laser pulse carries out phase place and amplitude modulation(PAM), obtains the variation tendency of the different dissociation channels of a certain ion with laser light field.
More than just the present invention will be further described, is not in order to the restriction this patent, all for the present invention's equivalence enforcement, all should be contained within the claim scope of this patent.
Claims (9)
1. one kind based on the molecular photodissociation of the quantum coherent control method from photo ionization, it is characterized in that this method carries out inverting to the ion velocity slice image that femto-second laser pulse and matter interaction obtain, obtain the channel branch ratio, the ionizing efficiency of dissociating, angular distribution, VELOCITY DISTRIBUTION, the Energy distribution parameter, these parameters are fed back to the femto-second laser pulse shaping by the close-loop feedback control program based on genetic algorithm, utilize femto-second laser pulse and interaction of molecules after the shaping, change the branching ratio between the different products, or select the different excitation state of same product to carry out population, the reaction channel that selective exitation is different, by the selection of the accurate control of quantum coherent to the molecular reaction passage, realize the ionization of Molecular Selection photodissociation, the molecular photodissociation of its quantum coherent control may further comprise the steps from the method for photo ionization:
(a) laser pulse
Centre wavelength is 800nm, and the synchronous femtosecond laser of pulsewidth 50fs enters the femto-second laser pulse shaping;
(b) molecular photodissociation is from photo ionization
Femto-second laser pulse after the shaping and molecular beam interact, the photodissociation photo ionization takes place, the different kinds of ions that produces flies to microchannel plate under the effect of ion lens, produce the ion velocity slice image on fluorescent plate, by strengthening the CCD camera its image is taken;
(c) sectioning image inverting
The ion velocity slice image is carried out inverting, obtain VELOCITY DISTRIBUTION, angular distribution, Energy distribution parameter;
(d) based on the close-loop feedback control of genetic algorithm
Above-mentioned parameter is fed back to the femto-second laser pulse shaping by the close-loop feedback control program based on genetic algorithm, utilize femto-second laser pulse and interaction of molecules after the shaping, change the branching ratio between the different products, or select the different excitation state of same product to carry out population, with the different reaction channel of selective exitation.
2. a use is according to claim 1 based on the molecular photodissociation of the quantum coherent control device from the method for photo ionization, it is characterized in that this device is by the femto-second laser pulse orthopedic systems, molecular photodissociation is from the photo ionization system, data acquisition and software systems are formed, molecular photodissociation carries out slice imaging from the photo ionization system with the ion that femto-second laser pulse and matter interaction obtain, image processing program in the operating software system is handled the ion velocity slice image, obtain VELOCITY DISTRIBUTION, angular distribution, the Energy distribution parameter, then these parameters are handled by data acquisition and software systems and fed back to the femto-second laser pulse orthopedic systems, to optimize the strength ratio and different product branching ratios that laser pulse changes different ions, or different excitation state in the same product of selection population, with different reaction channel in the same product of selective exitation, realize the accurate control of molecular photodissociation quantum coherent in ionization;
The femto-second laser pulse orthopedic systems is made up of synchronous femtosecond laser, first balzed grating,, first concave mirror, spatial light modulator, second concave mirror and second balzed grating,, spatial light modulator is arranged between first concave mirror and second concave mirror, first balzed grating, and the corresponding in twos setting of first concave mirror, second concave mirror and the corresponding in twos setting of second balzed grating,, the light path that makes femtosecond laser is on same horizontal plane;
Molecular photodissociation from the photo ionization system by inert gas source, sample cell, vacuum cavity, the dried pump of prime, molecular pump, the two-dimensional adjustment dish is formed, vacuum cavity is last, two cylindrical cavities are inverted "T"-shaped setting down, and two cylindrical cavity axis normal, be provided with the pulse valve that connects the pulse power in the last cylindrical cavity, the below of pulse valve is provided with strainer, be provided with first pole plate that connects first high-voltage DC power supply in the following cylindrical cavity, second pole plate, tri-electrode, the drift utmost point pole plate group of quadripolar plate and ground connection, the side of following cylindrical cavity is provided with the microchannel plate that connects second high-voltage DC power supply, the fluorescent plate that connects the 3rd high-voltage DC power supply, fluorescent plate outside correspondence is provided with and strengthens the CCD camera, photomultiplier, last cylindrical cavity top is provided with the two-dimensional adjustment dish, the one side is provided with the dried pump of prime, molecular pump, following cylindrical cavity is provided with the dried pump of another prime, molecular pump, sample cell is connected with pulse valve through the two-dimensional adjustment dish by the second carrier gas pipe, and sample cell is connected with inert gas source by the first carrier gas pipe;
Data acquisition and software systems are made up of enhancing CCD camera, photomultiplier, computer, data collecting card, and computer is connected with spatial light modulator, enhancing CCD camera respectively, and data collecting card is connected with photomultiplier.
According to the described molecular photodissociation based on quantum coherent control of claim 2 from the photo ionization device, it is characterized in that described spatial light modulator is combined by two liquid crystal boards, be arranged on the focal plane of first concave mirror, the laser pulse of each frequency content is carried out phase place and amplitude modulation(PAM).
According to the described molecular photodissociation based on quantum coherent control of claim 2 from the photo ionization device, it is characterized in that the coaxial setting of described strainer and pulse valve, and the center between first pole plate and second pole plate.
According to the described molecular photodissociation based on quantum coherent control of claim 2 from the photo ionization device, it is characterized in that described two-dimensional adjustment dish is orthogonal two adjustable screw bars, the position of fine setting pulse valve makes the center interaction of synchronous laser between first pole plate and second pole plate after pulse molecular beam and the modulation.
According to the described molecular photodissociation based on quantum coherent control of claim 2 from the photo ionization device, it is characterized in that described drift utmost point pole plate group is made up of the stainless steel plectane that the several piece center that connects successively is provided with circular hole, along cylindrical cavity axis setting down.
According to the described molecular photodissociation based on quantum coherent control of claim 2 from the photo ionization device, it is characterized in that ion lens group and microchannel plate, the coaxial setting of fluorescent plate that described first pole plate, second pole plate, tri-electrode, quadripolar plate and drift utmost point pole plate group constitute.
According to the described molecular photodissociation based on quantum coherent control of claim 2 from the photo ionization device, it is characterized in that described data collecting card is the binary channels sampling, high sampling rate 2GS/s, 8 vertical resolutions, Memory 256MB.
According to the described molecular photodissociation based on quantum coherent control of claim 2 from the photo ionization device, it is integrated to it is characterized in that described computer is provided with the software of the close-loop feedback control program, open loop ACTIVE CONTROL program and the image processing program that comprise based on genetic algorithm.
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2009
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