A sample loading device for laser ablation

Abstract

The invention discloses a sample loading device for laser ablation, which comprises a target base, a base, an air channel, an aerosol channel and a sample cavity. surface; the sample chamber is provided with a spring, and the spring is used to limit the sample target to the sample chamber and be pushed against the shrinkage port; the lower surface of the sample chamber is provided with an opening, and the opening is connected to the air outlet through the air channel; the air outlet There is a stop valve, the stop valve is used to open and close the air outlet; one end of the aerosol channel is connected to the carrier gas inlet, and the other end is connected to the aerosol outlet, and the top of the aerosol channel includes a first light-transmitting material to allow the laser The light transmissive material transmits the top of the aerosol channel and ablate the sample target. The invention can be loaded with a plurality of sample targets, improves the stability and reliability during continuous use, improves the consistency of aerosol transmission efficiency, and enables the analysis of different samples to have the same analysis conditions of mass spectrometers.

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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