CN115295393A - Laser ionization method for isotope mass spectrometry detection - Google Patents
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- 238000004949 mass spectrometry Methods 0.000 title claims abstract description 21
- 238000000752 ionisation method Methods 0.000 title claims abstract description 13
- 238000001514 detection method Methods 0.000 title claims abstract description 7
- 238000002536 laser-induced breakdown spectroscopy Methods 0.000 claims abstract description 71
- 238000001819 mass spectrum Methods 0.000 claims abstract description 20
- 238000004458 analytical method Methods 0.000 claims abstract description 17
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract 2
- 230000005284 excitation Effects 0.000 claims description 17
- 239000007787 solid Substances 0.000 claims description 16
- 230000003595 spectral effect Effects 0.000 claims description 9
- 230000005855 radiation Effects 0.000 claims description 8
- 238000001228 spectrum Methods 0.000 claims description 7
- 230000005684 electric field Effects 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 230000001133 acceleration Effects 0.000 claims description 3
- 238000000921 elemental analysis Methods 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 abstract description 36
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000006073 displacement reaction Methods 0.000 abstract description 4
- 150000002500 ions Chemical class 0.000 description 10
- 239000013307 optical fiber Substances 0.000 description 10
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000002679 ablation Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000005014 resonance ionization mass spectroscopy Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000004760 accelerator mass spectrometry Methods 0.000 description 1
- 238000001675 atomic spectrum Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000001095 inductively coupled plasma mass spectrometry Methods 0.000 description 1
- 238000002307 isotope ratio mass spectrometry Methods 0.000 description 1
- 238000004989 laser desorption mass spectroscopy Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000816 matrix-assisted laser desorption--ionisation Methods 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 230000005658 nuclear physics Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001004 secondary ion mass spectrometry Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000000176 thermal ionisation mass spectrometry Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
- G01N27/64—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode using wave or particle radiation to ionise a gas, e.g. in an ionisation chamber
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- H01J49/062—Ion guides
- H01J49/063—Multipole ion guides, e.g. quadrupoles, hexapoles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/26—Mass spectrometers or separator tubes
- H01J49/34—Dynamic spectrometers
- H01J49/42—Stability-of-path spectrometers, e.g. monopole, quadrupole, multipole, farvitrons
- H01J49/4205—Device types
- H01J49/422—Two-dimensional RF ion traps
- H01J49/4225—Multipole linear ion traps, e.g. quadrupoles, hexapoles
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Abstract
The invention discloses a laser ionization method for isotope mass spectrometry detection, which is realized on a laser ion source. The method comprises three steps of LIBS (laser induced breakdown spectroscopy) primary element analysis, SLRI laser wavelength selection and SLRI secondary ionization. The invention has the advantages that based on LIBS laser and secondary laser resonance ionization SLRI, the primary analysis of the composition and the content of elements can be simultaneously carried out when the primary ionization of LIBS is realized; in the second resonance ionization, the resonance wavelength may be preferentially selected based on prior knowledge of atomic energy levels of elemental isotopes analyzed by the first LIBS. The four-path SLRI optical path configuration realizes the tunable laser output from ultraviolet to infrared, and can meet the secondary laser resonance ionization mass spectrum measurement of all isotope displacement and atom hyperfine structures.
Description
Technical Field
The invention relates to a mass spectrum ionization method, in particular to an isotope mass spectrum Laser ionization method based on combination of LIBS (Laser-induced breakdown spectroscopy) and secondary Laser resonance ionization SLRI (Laser-induced breakdown spectroscopy), and belongs to the field of photoelectric detection.
Background
Isotope mass spectrometry requires isotopes of different elements, requires extremely high resolution, is a hot spot and a highest spot in the mass spectrometry field, and belongs to the high-end mass spectrometry field. Isotope mass spectrometry has emerged with the development of nuclear science and nuclear industry. Heretofore, isotope mass spectrometry such as stable isotope mass spectrometry, isotope ratio mass spectrometry, accelerator mass spectrometry, static analysis mass spectrometry, thermal ionization mass spectrometry, secondary ion mass spectrometry, and the like have been developed. It is worth noting that the development of laser technology makes the variety greatly enriched and the performance rapidly improved. A suitable laser source is a mass spectrometry ionization source with excellent performance. Technologies of using Laser as mass spectrometry and ionization means are becoming more and more abundant, and various Laser desorption mass spectrometry technologies such as Matrix assisted Laser desorption ionization (Matrix assisted Laser desorption) mass spectrometry, laser microprobe (Laser microprobe) mass spectrometry, laser resonance ionization (Laser resonance ionization) mass spectrometry, and Laser lift-off inductively coupled plasma mass spectrometry (LA-ICP-MS) have appeared.
The laser ionization multiple reflection flight time mass spectrum is taken as a hot spot field in the mass spectrum technology, in an atomic spectrum experiment, due to the selectivity of atomic level stimulated transition, the laser excitation is adopted for the stimulated ionization, so that the ionization efficiency is improved, specific elements or isotopes can be ionized by adopting specific wavelengths, and the laser ionization method has a huge development prospect in the nuclear industry, chemical industry and geological industry. Such as nuclear physics research, including accurate determination of atomic mass, determination of nuclear binding energy and packing curve, determination of the half-life of the radioisotope. The accurate measurement of isotope abundance and atomic weight finds the relationship between the mass and the short-life particles generated by natural reactor, nuclear reaction mechanism and nuclear reaction. Nuclear science and nuclear industry, analysis of ultra-low abundance isotope impurities, burnup and nuclear fuel purity analysis (B, pb, sm, Y, eu, th). Currently, nuclear science and protection put forward deeper requirements for the detection of radioactive elements and isotopes.
Aiming at the requirements, the invention provides an isotope mass spectrum laser ionization method which utilizes LIBS laser primary denudation ionization and ultrafast multiband OPO tuned secondary resonance ionization, and meets the requirement of high-precision isotope mass spectrum analysis.
Disclosure of Invention
The invention aims to provide an isotope mass spectrum laser ionization method, which realizes high-efficiency ionization of elements and isotopes thereof, and preliminarily obtains the element composition and content of an object to be detected by utilizing LIBS spectrum synchronous detection during ionization.
The invention is realized by the following steps:
the isotope mass spectrum laser ionization method provided by the invention is realized on a laser ion source; the laser ion source is used for realizing high-efficiency ion resonance excitation required by isotope high-precision analysis and meeting the requirements of optical mass spectrometry; the ion source consists of a controller, a LIBS subsystem, an SLRI subsystem, a time schedule controller and a sample cabin.
The LIBS subsystem consists of an LIBS laser, a spectrometer, an optical fiber, an LIBS focusing mirror, a total reflection mirror and an optical fiber coupling mirror and is used for carrying out primary ionization excitation on a sample in the same amount and preliminarily obtaining the element composition and content of the sample. The LIBS laser is a semiconductor pump solid laser, LIBS laser emitted by the LIBS laser travels along an emission optical axis, is reflected by a total reflection mirror, turns to a refraction and reflection axis, passes through an upper window by a LIBS focusing mirror and is focused on a sample in a sample cabin, the generated high-temperature ablation strips the gasified sample, and a primary ionized gas mass is generated. And cooling the plasma in the primary ionized air mass to a low level, wherein the radiated light upwards penetrates through the upper window along the main optical axis, is focused and coupled into the optical fiber surface through the optical fiber coupling mirror, and then is transmitted into the spectrometer to be converted into an LIBS spectrum signal.
The SLRI subsystem consists of a first path of OPO, a first path of ultrafast pump laser, a second path of OPO, a solid laser, a proportion beam splitter, a twin dye laser A, a full-reflection mirror A, a twin dye laser B, a frequency doubling module, a full-reflection mirror B, a bicolor slice A, a bicolor slice B, a bicolor slice C and an SLRI collecting lens; the SLRI subsystem adopts multi-channel laser to ionize the sample by the LIBS subsystem to obtain a primary ionized air mass, and selective secondary resonance excitation and ionization are carried out. The first path of ultrafast pump laser and the second path of ultrafast pump laser are the same solid laser, and the laser emitted by the first path of ultrafast pump laser and the laser emitted by the second path of ultrafast pump laser pump the first path of OPO and the second path of OPO along the first ionization optical axis and the second ionization optical axis respectively. After being pumped, the first path of OPO reserves the signal light part, is the first path of SLRI laser, and travels upwards along the main optical axis after being reflected by the dichroic filter C; and after being pumped, the second path of OPO reserves an idle frequency light part, is a second path of SLRI laser, travels upwards along a main optical axis after being reflected by the bicolor sheet B, passes through the bicolor sheet C and then is converged with the first path of SLRI laser. Laser emitted by the solid laser passes through the proportional beam splitter, pumps the twin dye laser A along the third ionization optical axis, generates visible near-red band laser with tunable wavelength, is a third SLRI laser, travels upwards along the main optical axis after being reflected by the dichroic beam splitter A, passes through the dichroic beam splitter B and the dichroic beam splitter C, and then is converged with the first two SLRI lasers; laser emitted by the solid laser is reflected by the proportional beam splitter and the full reflector A, then the laser is pumped by the twin dye laser B along the fourth ionization optical axis, and the generated tunable visible near-infrared band laser is frequency-doubled by the frequency doubling module to generate ultraviolet band tunable laser which is a fourth path SLRI laser, and after being reflected by the full reflector B, the fourth path SLRI goes upwards along the main optical axis, and then passes through the dichroic beam A, the dichroic beam B and the dichroic beam C to be converged with the first two three paths SLRI laser. The four-path SLRI optical path configuration realizes tunable laser output from ultraviolet to infrared, and can meet secondary laser resonance ionization mass spectrometry measurement of all isotope displacement and atom hyperfine structures. The merged four paths of SLRI laser pass through an SLRI focusing lens and a lower window, and are focused on a primary ionized air mass obtained by ionizing a sample by an LIBS subsystem to carry out selective secondary resonance excitation and ionization.
The sample cabin is provided with a sample electrode, and a sample is arranged on the sample electrode. The sample electrode can apply a certain direct current bias voltage, and a direct current electric field is formed between the sample electrode and the sample injection electrode of the rear-end mass spectrum system so as to attract ionized ions to enter the rear-end mass spectrum system for analysis. The sample cabin is provided with a lower window and an upper window, so that the ionization laser emitted by the LIBS subsystem and the SLRI subsystem can enter conveniently, and the LIBS can induce the plasma radiation light to pass out conveniently.
And the time sequence controller is used for starting and controlling the time sequence relation of starting the LIBS laser, the spectrometer, the first path of ultrafast pump laser, the second path of ultrafast pump laser and the solid laser.
The controller is used for starting the time schedule controller and receiving LIBS spectral data of the spectrometer for analysis. The controller is also used for tuning four SLRI output wavelengths of the first path of OPO, the second path of OPO, the twin dye laser A and the twin dye laser B.
The laser ionization method for isotope mass spectrometry provided by the invention comprises the following steps:
(1) LIBS preliminary elemental analysis
The controller sends out an instruction to start the time schedule controller. The time schedule controller controls to start the LIBS laser and starts the spectrometer to receive signals after a certain time delay. The LIBS laser emitted by the LIBS laser is focused onto the sample, producing a primary ionized air mass, along with LIBS radiation. The radiation light is transmitted into the spectrometer and converted into LIBS spectrum signals which are received by the spectrometer. The spectrometer sends LIBS spectral signals to a controller, which analyzes the elemental composition of the sample according to the spectral signals.
(2) SLRI laser wavelength selection
The controller obtains the element composition of the sample according to the first step, and calculates the optimal resonance excitation wavelength set corresponding to the isotopes of the elements according to the isotope atomic spectral parameters. The controller then tunes four SLRI output wavelengths, including all wavelengths in the optimal excitation wavelength set. And the time schedule controller controls to simultaneously start the first path of ultrafast pump laser, the second path of ultrafast pump laser and the solid laser.
(3) SLRI secondary ionization
After four paths of SLRI laser are converged, the converged laser passes through an SLRI focusing lens and a lower window, and is focused on a primary ionized air mass obtained by ionizing a sample by an LIBS subsystem, selective secondary resonance excitation is carried out, so that particles, particularly isotopes, which are insufficiently ionized for the first time are sufficiently ionized for the second time, and then the particles enter a rear-end mass spectrum system along a sample introduction axis for analysis under the acceleration of a direct current electric field between a sample electrode and a sample introduction electrode of the rear-end mass spectrum system.
The invention has the advantages that based on LIBS laser and secondary laser resonance ionization SLRI, the initial analysis of the composition and content of elements can be simultaneously carried out when the primary ionization of LIBS is realized; in the second resonance ionization, the resonance wavelength may be preferentially selected based on the prior knowledge of the atomic energy levels of the elemental isotopes from the first LIBS analysis. The four-path SLRI optical path configuration realizes the tunable laser output from ultraviolet to infrared, and can meet the secondary laser resonance ionization mass spectrum measurement of all isotope displacement and atom hyperfine structures.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention, in which: 1-a controller; 2-LIBS laser; 3-sample electrode; 4-time schedule controller; 5-first OPO; 6-first path ultrafast pump laser; 7-first ionization optical axis; 8-second path ultrafast pump laser; 9-second ionization optical axis; 10-second OPO; 11-third ionization axis; 12-solid state laser; 13-fourth ionization optical axis; 14-proportional beam splitter; 15-twin dye laser I; 16-total reflection mirror A; 17-twin dye laser B; 18-frequency doubling module; 19-total reflection mirror B; 20-two-color chip A; 21-two color chip B; 22-two-color chip C; 23-SLRI concentrating lens; 24-lower window; 25-sample chamber; 26-sample; 27-sample introduction shaft; 28-primary ionized air mass; 29-upper window; 30-folding axis; 31-LIBS focusing mirror; 32-emission optical axis; 33-total reflection mirror C; 34-LIBS subsystem; 35-fiber coupled mirror; 36-spectrometer; 37-main optical axis; 38-optical fiber; SLRI subsystem 39.
Note: OPO, optical parametric oscillator; SLRI, secondary laser resonance ionization, SLRI for short.
Detailed Description
The specific embodiment of the present invention is shown in fig. 1.
The isotope mass spectrum laser ionization method provided by the invention is realized on a laser ion source; the laser ion source is used for realizing high-efficiency ion resonance excitation required by isotope high-precision analysis and meeting the requirements of optical mass spectrometry; the ion source consists of a controller 1, a LIBS subsystem 34, an SLRI subsystem 39, a timing controller 4, and a sample chamber 25.
The LIBS subsystem 34 is composed of a LIBS laser 2, a spectrometer 36, an optical fiber 38, a LIBS focusing mirror 31, a total reflection mirror 33 and an optical fiber coupling mirror 35, and is used for carrying out primary ionization excitation on the sample 26 with the same quantity, and preliminarily obtaining the element composition and content of the sample 26. The LIBS laser 2 is a semiconductor pump solid laser, the LIBS laser (emission wavelength 1064nm, repetition frequency 300Hz, pulse width 400ps in this embodiment) emitted by the LIBS laser travels along an emission optical axis 32, is reflected by a total reflection mirror 33, turns to a catadioptric axis 30, passes through an upper window 29 by a LIBS focusing mirror 31, is focused on a sample 26 in a sample chamber 25, and generates a high-temperature ablation stripping gasified sample and a primary ionized air mass 28. The plasma in the primary ionized air mass 28 is cooled and transited to a low level, and the radiation light upwards penetrates through the upper window 29 along the main optical axis 37, is focused and coupled into the end face of the optical fiber 38 through the optical fiber coupling mirror 35, and then is transmitted into the spectrometer 36 to be converted into an LIBS spectral signal.
The SLRI subsystem 39 is composed of a first path of OPO5, a first path of ultrafast pump laser 6, a second path of ultrafast pump laser 8, a second path of OPO10, a solid laser 12, a proportion beam splitter 14, a twin dye laser A15, a full-reflection mirror A16, a twin dye laser B17, a frequency doubling module 18, a full-reflection mirror B19, a double-color slice A20, a double-color slice B21, a double-color slice C22 and an SLRI focusing lens 23; the SLRI subsystem 39 employs multiple lasers to selectively excite and ionize secondary resonances in the primary ionized air mass 28 obtained by ionizing the sample 26 with the LIBS subsystem 34. The first ultrafast pump laser 6 and the second ultrafast pump laser 8 are the same solid laser, and the laser emitted by them (the wavelength is 1064nm, the repetition frequency is 80MHz, and the pulse width is 15ps in this embodiment) respectively pumps the first optical path OPO5 and the second optical path OPO10 along the first ionization optical axis 7 and the second ionization optical axis 9. After being pumped, the first optical fiber loop 5 retains a signal light part (the tunable wavelength range of the embodiment is 1400 to 2000nm, and the pulse width is 15 ps), is a first SLRI laser, and travels upward along the main optical axis 37 after being reflected by the dichroic filter 22; after being pumped, the second optical path OPO10 retains an idler frequency part (the tunable wavelength range of the second optical path OPO is 2200 to 4200nm, and the pulse width is 20ps in this embodiment), and is the second path SLRI laser, which travels upward along the main optical axis 37 after being reflected by the dichroic plate b 21, and then joins with the first path SLRI laser after passing through the dichroic plate c 22. Laser (the wavelength of 532nm, the repetition frequency of 20kHz and the pulse width of 50ps in the embodiment) emitted by the solid laser 12 passes through the proportional beam splitter 14, the twin dye laser A15 is pumped along the third ionization optical axis 11 to generate laser (the wavelength of 450-850nm in the embodiment) with tunable wavelength in a visible near-red band, the laser is a third SLRI laser, the third SLRI laser is reflected by the dichroic plate A20, travels upwards along the main optical axis 37, passes through the dichroic plate B21 and the dichroic plate C22 and then is converged with the first second SLRI laser; after being reflected by the proportional beam splitter 14 and the total reflection mirror a 16, the laser emitted by the solid laser 12 is pumped along the fourth ionization optical axis 13 to the twin dye laser b 17 (the twin dye laser b 15 and the pumped twin dye laser b 17 are dye lasers with the same parameters), and the laser of the generated tunable visible near-infrared band is frequency-doubled by the frequency doubling module 18 to generate tunable laser of an ultraviolet band (wavelength range 225-425nm in this embodiment), which is a fourth-path SLRI laser, and after being reflected by the total reflection mirror b 19, the laser travels upwards along the main optical axis 37, passes through the dichroic mirror a 20, the dichroic mirror b 21 and the dichroic mirror c 22, and then is merged with the first two three-path SLRI lasers. The four-path SLRI optical path configuration realizes tunable laser output from ultraviolet to infrared (the wavelength range of 225-4200nm in the embodiment), and can meet the secondary laser resonance ionization mass spectrometry measurement of all isotope displacement and atom hyperfine structures. The merged four-path SLRI laser passes through an SLRI focusing lens 23 and a lower window 24, and is focused on a primary ionized air mass 28 obtained by ionizing a sample 26 by an LIBS subsystem 34, so as to perform selective secondary resonance excitation and ionization.
The sample chamber 25 is provided with a sample electrode 3, and a sample 26 is mounted on the sample electrode 3. The sample electrode 3 can apply a certain direct current bias voltage, and a direct current electric field is formed between the sample electrode and a sample injection electrode of the rear-end mass spectrum system so as to attract ionized ions to enter the rear-end mass spectrum system for analysis. The sample chamber 25 has a lower window 24 and an upper window 29 to facilitate entry of the ionizing laser light emitted by the LIBS subsystem 34 and the SLRI subsystem 39, and exit of the LIBS-induced plasma radiation light.
The time sequence controller 4 is used for starting and controlling the time sequence relation of the start of the LIBS laser 2, the spectrometer 36, the first ultrafast pump laser 6, the second ultrafast pump laser 8 and the solid laser 12.
The controller 1 is configured to turn on the timing controller 4, and receive LIBS spectrum data of the spectrometer 36 for analysis. The controller 1 is also used for tuning four paths of SLRI output wavelengths of the first path of OPO5, the second path of OPO10, the first twin dye laser 15 and the second twin dye laser 17.
The isotope mass spectrum laser ionization method provided by the invention comprises the following steps:
(1) LIBS preliminary elemental analysis
The controller 1 issues a command to start the timing controller 4. The timing controller 4 controls to turn on the LIBS laser 2, and after a certain delay (10 microseconds in this embodiment), turns on the spectrometer 36 to expose the received signal. LIBS laser light emitted by the LIBS laser 2 is focused onto the sample 26 to produce a primary ionized air mass 28, along with LIBS radiation. The radiated light is transmitted into the spectrometer 36 and converted into LIBS spectral signals that are received by the spectrometer 36. The spectrometer 36 sends LIBS spectral signals to the controller 1, from which the controller 1 analyses the elemental composition of the sample 26.
(2) SLRI laser wavelength selection
The controller 1 obtains the elemental composition of the sample 26 according to the first step, and calculates the optimal resonance excitation wavelength set corresponding to the isotopes of these elements according to the isotope atomic spectral parameters. The controller 1 then tunes the four SLRI output wavelengths, which include all wavelengths in the optimal set of excitation wavelengths. The time schedule controller 4 controls to simultaneously start the first path of ultrafast pump laser 6, the second path of ultrafast pump laser 8 and the solid laser 12.
(3) SLRI secondary ionization
After the four paths of SLRI laser are converged, the converged laser passes through an SLRI focusing lens 23 and a lower window 24, is focused on a primary ionized air mass 28 obtained by ionizing a sample 26 by an LIBS subsystem 34, is subjected to selective secondary resonance excitation, so that particles with insufficient ionization for the first time, particularly isotopes, are subjected to sufficient ionization for the second time, and then enters a rear-end mass spectrometry system along a sample introduction shaft 27 for analysis under the acceleration of a direct current electric field between a sample electrode 3 and a sample introduction electrode of the rear-end mass spectrometry system.
Claims (1)
1. A laser ionization method for isotope mass spectrometry detection, which is realized on a laser ion source, the laser ion source consists of a controller (1), a LIBS subsystem (34), a SLRI subsystem (39), a time schedule controller (4) and a sample chamber (25), and is characterized in that the method comprises the following steps:
1) LIBS preliminary elemental analysis
The controller sends out an instruction, a time sequence controller is started, the time sequence controller controls to start the LIBS laser, and a spectrometer light receiving signal is started after a certain time delay; LIBS laser emitted by the LIBS laser is focused on a sample to generate a primary ionized air mass and LIBS radiation light; the radiation light is transmitted into the spectrometer and converted into LIBS spectrum signals which are received by the spectrometer; the spectrometer sends the LIBS spectrum signal to a controller, and the controller analyzes the element composition of the sample according to the spectrum signal;
2) SLRI laser wavelength selection
The controller obtains the element composition of the sample according to the first step, and calculates the optimal resonance excitation wavelength set corresponding to the isotopes of the elements according to the isotope atomic spectral parameters; then, the controller tunes four paths of SLRI output wavelengths, wherein the output wavelengths comprise all the wavelengths in the optimal excitation wavelength set; the time schedule controller controls and simultaneously starts a first path of ultrafast pump laser, a second path of ultrafast pump laser and a solid laser;
3) SLRI secondary ionization
After the four paths of SLRI laser are converged, the converged laser passes through an SLRI focusing lens and a lower window, is focused on a primary ionized air mass obtained by ionizing a sample by an LIBS subsystem, is subjected to selective secondary resonance excitation, so that particles with insufficient ionization for the first time, particularly isotopes, are subjected to sufficient ionization for the second time, and then enters a rear-end mass spectrum system along a sample introduction shaft for analysis under the acceleration of a direct current electric field between a sample electrode and a sample introduction electrode of the rear-end mass spectrum system.
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Citations (3)
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| CN105572216A (en) * | 2015-12-30 | 2016-05-11 | 大连民族大学 | Novel flight time secondary ion mass spectrometer |
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| US20200136338A1 (en) * | 2017-02-24 | 2020-04-30 | National University Corporation Nagoya University | Laser device, method for controlling laser device, and mass spectroscope |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105572216A (en) * | 2015-12-30 | 2016-05-11 | 大连民族大学 | Novel flight time secondary ion mass spectrometer |
| US20200136338A1 (en) * | 2017-02-24 | 2020-04-30 | National University Corporation Nagoya University | Laser device, method for controlling laser device, and mass spectroscope |
| CN107907530A (en) * | 2017-12-15 | 2018-04-13 | 华中科技大学 | A kind of laser ablation secondary resonance laser induced breakdown spectroscopy detection method and device |
Non-Patent Citations (2)
| Title |
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| WAN, XIONG等: "Design, Function, and Implementation of China\'s First LIBS Instrument (MarSCoDe) on the Zhurong Mars Rover", ATOMIC SPECTROSCOPY, 24 November 2021 (2021-11-24) * |
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