CN115711935A - Laser micro-area in-situ oxygen isotope analysis device - Google Patents

Laser micro-area in-situ oxygen isotope analysis device Download PDF

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CN115711935A
CN115711935A CN202211311285.1A CN202211311285A CN115711935A CN 115711935 A CN115711935 A CN 115711935A CN 202211311285 A CN202211311285 A CN 202211311285A CN 115711935 A CN115711935 A CN 115711935A
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laser
ablation
oxygen
pulse
sample
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CN115711935B (en
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吕涛
范博文
尼洋
刘勇胜
陈力飞
陈海红
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China University of Geosciences
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China University of Geosciences
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Abstract

The invention discloses a laser micro-area in-situ oxygen isotope analysis device, which comprises an ablation pool, a short pulse ablation laser, a long pulse heating laser, a pulse delay control generator and an isotope analysis device, wherein the ablation pool is provided with a plurality of ablation holes; an oxygen-containing isotope sample is arranged in the denudation pool and is filled with reducing gas; the short pulse ablation laser is used for generating short pulse ablation laser, and the short pulse ablation laser is focused on the surface of the sample to generate plasma; the long pulse heating laser is used for focusing or collimating parallel light to act on denudation feathers (containing plasma) generated by short pulse denudation laser above the surface of the sample; the pulse delay control generator is used for controlling the relative delay of two laser pulses, so that the pulse width value of the long pulse heating laser is larger than the service life of the ablation plume, the ablation plume is heated to be fully reacted with reducing gas to generate oxygen, and the oxygen is conveyed to a gas mass spectrometer or other devices for analysis. The invention is suitable for micro-area in-situ oxygen isotope analysis.

Description

Laser micro-area in-situ oxygen isotope analysis device
Technical Field
The invention belongs to the field of geochemical analysis, and particularly relates to a laser micro-area in-situ oxygen isotope analysis device.
Background
Oxygen is a major component of crust and mantle rock and fluids, and isotopes of oxygen are considered to be effective tools for studying many geological processes. The conventional oxygen isotope analysis method mainly aims at whole rock and single mineral powder samples, the required sample amount is large, and the method can be only applied to a few minerals, so the method is adopted less and less. The laser probe BrF5 method and the ion probe analysis method developed in recent years have the advantages and the disadvantages respectively, the precision of the laser probe BrF5 method and the ion probe analysis method is high, the laser probe BrF5 method and the ion probe analysis method are suitable for various rock-making minerals and refractory side minerals, and the defect is that in-situ analysis cannot be carried out; the latter is suitable for analyzing minerals with nuclear structures, such as \30814stoneand olivine, but the accuracy of analysis is slightly lower.
In recent years, the combination of laser ablation sample introduction technology and mass spectrometry technology has made great progress in-situ analysis of light element isotopes, so whether the isotope analysis of oxygen in a solid sample can be performed by using LA-MC-ICP-MS (laser ablation multi-receiving plasma mass spectrometer) becomes a topic of interest. In rock, oxygen is usually present in the form of silicate, etc., and the oxygen is converted into gas to be conveyed to a gas mass spectrum for analysis. Therefore, it is necessary to invent a laser in-situ micro-area oxygen isotope analysis sampling-sampling device to realize the purpose of changing oxygen in solid oxygen-containing compounds (such as silicon dioxide) into gas and conveying the gas into a gas mass spectrum for analysis.
Disclosure of Invention
The invention aims to provide a laser micro-area in-situ oxygen isotope analysis device, which realizes the analysis of a sample micro-area in-situ oxygen isotope.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a laser micro-area in-situ oxygen isotope analysis device comprises an ablation pool, a short pulse ablation laser, a long pulse heating laser, a pulse delay control generator and an isotope analysis device;
an oxygen-containing isotope sample is filled in the denudation pool and is filled with reducing gas;
the short pulse ablation laser is used for generating short pulse ablation laser, and the short pulse ablation laser is focused on the surface of a sample to generate ablation plume;
the long pulse heating laser is used for focusing or collimating parallel light to act on denudation feathers (containing plasma) generated by short pulse denudation laser above the surface of the sample;
the pulse delay control generator is connected with the long pulse heating laser and the short pulse ablation laser and is used for controlling the relative delay of two laser pulses, so that the pulse width of the long pulse heating laser is greater than the service life of the ablation plume, the ablation plume is heated to be fully reacted with reducing gas to generate oxygen, and the oxygen is conveyed to the isotope analysis device for analysis.
Further, the pulse delay control generator synchronously or asynchronously controls the long pulse heating laser and the short pulse ablation laser.
Furthermore, the device also comprises a first beam expander and a first focusing lens, wherein the first beam expander and the first focusing lens are sequentially arranged at a light outlet of the short pulse ablation laser so as to expand and focus the short pulse ablation laser.
Furthermore, the device still includes second beam expander and second focusing mirror, and second beam expander and second focusing mirror set gradually in the light-emitting window of long pulse heating laser instrument to expand and focus long pulse heating laser.
Furthermore, the long pulse heating laser utilizes the chemical bond combined with oxygen in the oxygen-containing isotope sample to strongly absorb light of a certain wave band, so that the denudation plume is heated to be fully reacted with reducing gas to generate oxygen.
Furthermore, the isotope analysis device is a gas mass spectrometer, and the content and the ratio of the oxygen isotope are detected by the gas mass spectrometer, so that the analysis of the sample micro-area in-situ oxygen isotope is realized.
Furthermore, the device also comprises a gas purification device, so that a plurality of non-oxygen gases generated by the reaction in the denudation pool are filtered, and pure oxygen enters the isotope analysis device.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention adopts a pulse delay control generator to synchronously or asynchronously control two lasers, namely a short pulse ablation laser and a long pulse heating laser, wherein the short pulse laser is responsible for in-situ ablation of a micro-area oxygen-containing isotope sample to generate ablation plume; by utilizing the strong absorption of chemical bonds in the oxygen-containing isotope sample to the long-pulse heating laser, the aim of heating the sample denuded plume generated by denudation to fully react with reducing gas and reduce the oxygen isotope fractionation is fulfilled. The invention can be used in the fields of geochemical analysis and the like, is suitable for micro-area in-situ oxygen isotope analysis at present, and can be used for analyzing the content of other trace elements or trace elements, the isotope composition and the ratio.
Drawings
Fig. 1 is a schematic structural view of a laser micro-area in-situ oxygen isotope analysis apparatus according to the present invention.
In the figure: the method comprises the following steps of 1-an ablation pool, 2-a sample, 3-ablation feather, 4-an air inlet, 5-an air outlet, 6-a pulse delay control generator, 7-a short pulse ablation laser, 71-a first beam expander, 72-a first focusing mirror, 73-a reflector, 8-a long pulse heating laser, 81-a second beam expander, 82-a second focusing mirror, 9-a three-dimensional control platform, 10-a gas purification device and 11-a gas mass spectrometer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The laser micro-area in-situ oxygen isotope analysis device adopts a pulse delay control generator to synchronously or asynchronously control two lasers, namely a short pulse denudation laser and a long pulse heating laser, wherein the short pulse laser is responsible for micro-area in-situ denudation of an oxygen-containing isotope sample to generate denudation plume; the long pulse heating laser utilizes chemical bonds in an oxygen-containing isotope sample to strongly absorb light of a certain waveband, so that sample denudation plumes generated by denudation are heated to fully react with reducing gas to generate oxygen molecules, and the purpose of oxygen isotope detection is achieved; the pulse delay control generator is adopted to control the time delay of the ablation laser pulse and the heating laser pulse, so that the pulse width of the heating laser is larger than the service life of the ablation plume, the full reaction of the ablation plume and the reducing gas is realized, and the oxygen isotope fractionation is reduced. Therefore, the device can be used for micro-area in-situ oxygen isotope analysis, and heating lasers with different wavelengths can be used for analyzing the content of other trace or trace elements and the composition and ratio of isotopes.
The laser micro-area in-situ oxygen isotope analysis device mainly comprises a delayed double-pulse laser ablation heating-micro reaction unit and a special laser sample ablation pool, wherein the time sequence of ablation laser and heating laser is controlled to promote the dissociated reducing gas and the oxygen-containing isotope sample to perform sufficient chemical reaction in the laser ablation process so as to generate oxygen molecules capable of being detected by a gas mass spectrometer and reduce oxygen isotope fractionation. Wherein, the pulse delay control generator synchronously or asynchronously controls the two lasers to work, and after the long pulse heating laser is expanded, the long pulse heating laser focuses on the denudation plume (containing plasma) generated by the short pulse laser above the surface of the sample; the short pulse ablation laser is expanded and vertically focused on the surface of a sample to form an ablation pit and generate ablation feathers on the surface of the sample. The pulse delay control generator is used for setting the relative delay of two laser pulses, so that the purpose that a sample ablation plume generated by short-pulse laser ablation can be continuously heated by heating laser is achieved, the types, the concentrations and the motion states of active particles are improved, the sufficient chemical reaction between reducing gas and oxygen in a solid sample is realized, oxygen molecules are generated, and then the oxygen molecules are sent into a gas mass spectrometer for detection by carrier gas with a certain flow rate.
The working principle of the device is as follows: when the energy density of the laser pulse focused on the surface of the sample exceeds the sample ablation threshold value of the oxygen-containing isotope, substances in the focused speckle area can be instantaneously separated from the surface of the sample in the forms of atoms, molecules, ions and the like. When the pulse width of the laser changes in the order of femtosecond, nanosecond and microsecond, substances in the sample are sprayed from denudation to re-condensation and attached to the surface of the sample, and the duration of the whole process is respectively in the order of nanosecond, microsecond or even millisecond. The method comprises the steps of selecting nanosecond, picosecond or even femtosecond short pulse ablation laser with different parameters (including wavelength, energy, frequency and the like) and microsecond long pulse heating laser combination, focusing the ablation laser on the surface of a sample containing oxygen isotopes to generate ablation plumes under the environment condition of reducing gas with a certain flow rate, changing the pressure and temperature of the ablation plumes by using subsequent heating laser, improving the types, the concentrations and the motion states of active particles, promoting the ablated oxygen isotope substances to fully react with the reducing gas to generate oxygen, eliminating other impurity gases after purification, and detecting the content and the ratio of the oxygen isotopes by using a gas mass spectrometer to realize the analysis of the in-situ oxygen isotopes in sample micro-areas.
As shown in fig. 1, the same frequency and a certain relative delay time are set for the two channels of operation of two lasers (a short-pulse ablation laser 7 and a long-pulse heating laser 8) controlled by a pulse delay control generator 6, wherein the pulse width of the short-pulse ablation laser is set by the laser itself and can be controlled without using the pulse delay control generator 6, and the pulse width of the laser pulse of the long-pulse heating laser 8 is set by the pulse delay control generator 6 (several microseconds to several hundred microseconds). The sample 2 containing the oxygen isotope is placed in a closed special ablation tank 1, the ablation tank 1 is placed on a three-dimensional control platform 9, air in the ablation tank 1 is exhausted, and reducing gas is continuously introduced to fill the whole ablation tank 1. After the heating laser pulse is delayed to pass through the second beam expander 81 and the second focusing lens 82, the heating laser pulse is focused on the upper part of the surface of the sample 2 in parallel through the optical glass window to generate a heating area which is changed along with the frequency and the pulse width, and then the ablation laser pulse passes through the first beam expander 71, the reflector 73 and the first focusing lens 72, and is vertically focused on the surface of the sample 2 through the corresponding optical glass window to generate ablation plume 3. Heating a heating area formed by focusing of laser pulses, so that an ablation plume 3 generated by short-pulse laser ablation of an oxygen-containing isotope sample can be continuously heated by the heating laser, the sufficient chemical reaction between reducing gas and oxygen in the ablation plume 3 is realized, the gas generated by the reaction is sent into a gas purification device 10 through a gas outlet 5 by carrier gas blown in at high speed through a gas inlet 4, the filtering of various non-oxygen gases generated by the reaction in an ablation pool is realized, and pure oxygen enters a gas mass spectrometer 11 for analysis. The pulse delay control generator 6 is used for controlling the relative time delay of the ablation laser pulse and the heating laser pulse, so that the pulse width of the heating laser completely covers the service life of the ablation plume 3 when the heating laser is not heated, and the laser wavelength of the heating laser is selected to be a wave band which has strong absorption on a chemical bond combined with oxygen in the oxygen-containing isotope sample, so that the sample 2 can fully react with reducing gas, and the oxygen isotope fractionation is reduced. For example: the gas formed after the bromine pentafluoride liquid is vaporized reacts with a silicon dioxide solid sample, and a silicon-oxygen bond has strong absorption to light in an infrared band, so that the silicon-oxygen bond can be promoted to be broken by heating with laser in the infrared band, and the reaction efficiency with bromine pentafluoride steam is improved.
In conclusion, the invention adopts the pulse delay control generator to synchronously or asynchronously control two lasers, namely the short pulse ablation laser and the long pulse heating laser, wherein the short pulse laser is responsible for micro-area in-situ ablation of the oxygen-containing isotope sample to generate ablation plumes; the long pulse heating laser utilizes chemical bonds in the oxygen-containing isotope sample to strongly absorb light of a certain wave band, so that the sample ablation plume generated by ablation is heated to achieve the purposes of fully reacting with reducing gas and reducing oxygen isotope fractionation. The invention can be used in the fields of geochemical analysis and the like, and is currently suitable for micro-area in-situ oxygen isotope analysis, and the analysis of the content of other trace elements or trace elements and the composition and ratio of isotopes.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the scope of the present invention.

Claims (7)

1. A laser micro-area in-situ oxygen isotope analysis device is characterized by comprising an ablation pool, a short pulse ablation laser, a long pulse heating laser, a pulse delay control generator and an isotope analysis device;
an oxygen-containing isotope sample is filled in the denudation pool and is filled with reducing gas;
the short pulse ablation laser is used for generating short pulse ablation laser, and the short pulse ablation laser is focused on the surface of the sample to generate ablation plumes;
the long pulse heating laser is used for focusing or collimating parallel light on ablation plumes generated by short pulse ablation laser above the surface of a sample;
the pulse delay control generator is connected with the long pulse heating laser and the short pulse ablation laser and is used for controlling the relative delay of two laser pulses, so that the pulse width value of the long pulse heating laser is larger than the service life of the ablation plume, the ablation plume is heated to be fully reacted with reducing gas to generate oxygen, and the oxygen is conveyed to the isotope analysis device for analysis.
2. The laser micro-zone in situ oxygen isotope analysis apparatus of claim 1, wherein the pulse delay control generator synchronously or asynchronously controls the long pulse heating laser and the short pulse ablation laser.
3. The laser micro-area in-situ oxygen isotope analysis device according to claim 1, further comprising a first beam expander and a first focusing lens, wherein the first beam expander and the first focusing lens are sequentially arranged at a light outlet of the short pulse ablation laser to expand and focus the short pulse ablation laser.
4. The laser micro-area in-situ oxygen isotope analysis apparatus according to claim 1, further comprising a second beam expander and a second focusing lens, wherein the second beam expander and the second focusing lens are sequentially disposed at a light outlet of the long pulse heating laser to expand and focus the long pulse heating laser.
5. The laser micro-zone in-situ oxygen isotope analysis apparatus according to claim 1, wherein the long pulse heating laser uses chemical bonds in the oxygen-containing isotope sample that are bonded with oxygen to strongly absorb light of a certain wave band, so as to heat denudation plume to generate oxygen through sufficient reaction between the denudation plume and reducing gas.
6. The laser micro-area in-situ oxygen isotope analysis device of claim 1, wherein the isotope analysis device is a gas mass spectrometer, and the gas mass spectrometer detects the content and ratio of oxygen isotopes to realize analysis of the micro-area in-situ oxygen isotopes of the sample.
7. The laser micro-area in-situ oxygen isotope analysis apparatus according to claim 1, further comprising a gas purification device for filtering out a plurality of non-oxygen gases generated by the reaction in the denudation pool, so that pure oxygen enters the isotope analysis apparatus.
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