A uniform gas flow laser ablation pool and its application

A laser ablation and uniform technology, applied in the preparation of test samples, instruments, measuring devices, etc., can solve the problems affecting the transmission efficiency of ablation particles and the inability to form uniform airflow, and achieve the elimination of gravity deposition, elimination of dead volume, and elimination of particles The effect of the difference in transmission efficiency

Active Publication Date: 2019-07-02
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current commercial laser ablation pool, different airflow patterns will be formed at different positions, and uniform airflow cannot be formed
When a vortex is formed in the laser ablation pool, most of the ablation particles will follow the flow direction of the vortex, which will affect the transmission efficiency of the ablation particles

Method used

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  • A uniform gas flow laser ablation pool and its application
  • A uniform gas flow laser ablation pool and its application
  • A uniform gas flow laser ablation pool and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1: An experiment to evaluate the transmission efficiency of different ablation positions in a uniform gas flow laser ablation cell.

[0047] In this embodiment, a high-resolution multi-receiving inductively coupled plasma mass spectrometer (MC-ICP-MS) is used to approximate the transmission efficiency of laser ablation particles according to the peak and shape of the isotope signal peak and the pulse response time, and whether there is vortex.

[0048] In order to evaluate the transmission efficiency at different denudation locations, Balma pyrite (standard sample of pyrite with uniform Fe isotopic composition) was used as samples and poured on two epoxy resin plates with a diameter of 1.77 cm and one with a diameter of 2.54 cm. epoxy resin plate, and then polished to obtain three sample targets with a flat and smooth surface suitable for laser ablation analysis, the three sample targets were placed in such as Figure 5 The three sample positioning trays are sh...

Embodiment 2

[0052] Example 2: An experiment to evaluate the reduction of position effect in a uniform gas flow laser ablation cell.

[0053] This embodiment is based on the embodiment 1 to further evaluate the effect of reducing the position effect of the laser ablation pool with uniform gas flow. Since the elemental signal shape and impulse response time are in addition to being affected by position effects, e.g. 56 The Fe signal is also affected by the element concentration and the energy density of the laser beam. Although the composition of Fe isotopes in Balma pyrite grains is uniform, there may be differences in Fe concentration in Balma pyrite grains in different regions of the same sample target or different sample targets. The energy density of the same laser beam may also be different at different ablation positions. For example, in the GeoLasPro 193nm excimer laser ablation system, the energy density of the laser beam is set to 1.5J / cm 2 , its energy density may be 1.3J / cm 2...

Embodiment 3

[0061] Embodiment 3: The application experiment of uniform gas flow laser ablation cell in measuring Fe isotope composition of H1 pyrite (H1pyrite, laboratory internal standard).

[0062] In embodiment 3, using H1 pyrite as a sample, adopting the same method as in embodiment 1 to make a sample target with a diameter of 1.77 cm is placed on the B sample positioning plate, and using Balma pyrite as a standard material to make a diameter of 1.77 cm A sample target of cm was placed in the A sample positioning plate, and the Fe isotope composition in the H1-type pyrite sample was analyzed by laser ablation multi-receiver inductively coupled plasma mass spectrometry and solution method multi-receiver inductively coupled plasma mass spectrometry. The Fe isotope composition results of H1 pyrite samples obtained by these two methods are shown in Table 3 and Figure 8 As shown, the results of laser micro-area analysis and solution method are consistent within the analytical error range,...

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Abstract

The invention relates to a uniform airflow laser denudation tank and application thereof. The laser denudation tank comprises a uniform airflow generator, a sample chamber and a sample guiding portion. The uniform airflow generator comprises a wall, and a generator inner cavity. The generator inner cavity is divided into single-layer buffer sieve plates of a first buffer zone and a second buffer zone, a metal gas pipe is implanted in the first buffer zone, the outer end of the metal gas pipe is a gas inlet, the tube wall of the metal gas pipe is provided with at least 5 gas exhaust holes, theholes open to the upper wall of the generator inner cavity; the sample chamber is in gas communication with the second buffer zone through a multi-layer sieve plate, and the sample guiding portion communicates with the sample chamber in a fluid mode; the sample guiding portion is provided with a lead-out port. The laser denudation tank can provide a uniform airflow to reduce particle transmissionefficiency in different denuding positions, thereby reducing an influence of a position effect on accuracy and precision of isotopic fractionation results, and has important application value in the field of high-precision isotopic composition analysis.

Description

technical field [0001] The invention relates to a uniform gas flow laser ablation cell and its application, and belongs to the technical field of element isotope composition detection. Background technique [0002] In recent years, laser ablation multi-acceptor inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) has been widely used in stable isotope geochemistry, for example, the analysis of Li, B, Mg in minerals, meteorites and glass samples , Si, Ca, Fe, Cu and other elements isotopic composition. Current research shows that the fractionation of stable isotopes in nature is a few thousandths, which provides us with a new way to invert various geological processes, and at the same time puts forward very high requirements for the analytical precision and accuracy of analytical techniques. [0003] Laser ablation multi-receiver inductively coupled plasma mass spectrometry has high spatial resolution and high analysis speed, as well as high accuracy and precision, so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/44G01N27/62
CPCG01N1/44G01N27/62
Inventor 谢烈文
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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