Sample loading device for laser ablation

Abstract

The invention discloses a sample loading device for laser ablation. The sample loading device for the laser ablation comprises a target seat, a base, an air passage, an aerosol passage and a sample cavity, wherein the top of the sample cavity is provided with a shrinkage port, the shrinkage mouth is located at the lower surface of the aerosol passage; a spring is arranged in the sample cavity andused for limiting the sample target in the sample cavity and making the sample seat abut the shrinkage port; the surface of the lower portion of the sample cavity is provided with an opening, and theopening is communicated with an air outlet through the air passage; the air outlet is provided with a stop valve used for opening and closing the air outlet; one end of the aerosol passage is communicated with a carrier gas inlet, the other end of the aerosol passage is communicated with an aerosol outlet, and the top of the aerosol passage comprises a first transparent material so that a laser can pass through the first transparent material to transmit the top of the aerosol passage and ablate the sample target. The sample loading device for the laser ablation has the advantages that a plurality of sample targets can be loaded, the stability and reliability during continuous use are improved, the consistency of the aerosol transport efficiency is improved, and the analysis of different samples has same mass spectrometer analysis conditions.

Description

technical field [0001] The invention relates to the field of sample loading devices, in particular to a sample loading device for laser ablation. Background technique [0002] Laser in-situ analysis technology (including LIBS and LA-ICP-MS) is a technology that can realize in-situ sampling in the micron region. It combines laser ablation with spectroscopy or plasma mass spectrometry to determine the main and trace element content or isotope composition of the sample. analyze. In recent years, this technology has been widely used in earth science, modern technological archaeology, material science, life science and other fields. [0003] Laser in-situ analysis technology is to focus the laser on the surface of the sample through the optical path to ablate the sample, analyze the plasma generated by the ablation to obtain LIBS spectral signals, and analyze the aerosol generated by ablation to obtain ion signals through mass spectrometry. The two can complement each other. In...

AI Technical Summary

Problems solved by technology

The former sample cavity is small in size, and generally only one sample target and a standard target can be loaded at the same time. Moreover, if the position of the sample in the sample cavity is different, it will often affect the aerosol transmission efficiency and cause serious fractionation effects, affecting the accuracy of the analysis results; In the latter, because the main sample chamber is large and the small sample chamber is near the top, it is difficult to completely replace the air in the main sample chamber with carrier gas (usually helium), and the slowly released oxygen in the sample target and carrier gas will gradually accumulate in the In the main sample chamber, the mass spectrometry interference caused by oxygen gradually increases, making the baseline of some elements gradually increase during the analysis (such as 16 o 16 O interference 32 S signal, 16 o 40 Ar interference 56 Fe signal, etc.), affecting the signal-to-noise ratio, and resulting in poor analysis accuracy of the content of the interfered element and isotope ratio, and a decrease in the detection limit

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