Multi-target-position denudation device for overcoming spatial position effect in laser micro-area in-situ test

Abstract

The invention provides a multi-target-position denudation device for overcoming a spatial position effect in a laser micro-area in-situ test. The device comprises a sample table, a laser head and a denudation pool. The denudation pool is fixed under the laser head through a connecting rod. The denudation pool is of a hollow structure, a transparent window allowing laser to penetrate through is installed at a top opening of the denudation pool in a sealed mode, an inner cavity of the denudation pool is divided into an inner layer and an outer layer through a spacer ring, the inner layer is a denudation cavity, the outer layer is a vacuum cavity, an air inlet pipe and an air outlet pipe are arranged on the two sides of the denudation cavity respectively, and the side wall of the vacuum cavity is provided with a vacuum orifice and is connected with a vacuum generator. The sample table is installed on the three-axis displacement platform and is of a double-layer plate type structure. The multi-target-position denudation device is provided with the multiple target positions, and the target positions are convenient to switch; meanwhile, the denudation pool is sealed through vacuum, and the overall sealing performance of the denudation pool can be guaranteed; and most importantly, the multi-target-position denudation device can overcome the spatial position effect in the laser micro-area in-situ test.

Description

technical field [0001] The invention provides a multi-target laser ablation cell, in particular provides an ablation cell capable of overcoming spatial position effects in laser micro-area in-situ testing, and belongs to the field of laser ablation plasma light / mass spectrometry analysis. Background technique [0002] Laser ablation inductively coupled plasma light / mass spectrometry is one of the most successful and effective techniques for direct element or isotope analysis of solid samples. When performing laser ablation inductively coupled plasma / mass spectrometry, the sample is usually placed in an ablation cell, and the laser ablation sample surface produces analyte aerosol, which is sent to the plasma light / mass spectrometer for detection by the carrier gas. In recent years, laser ablation system combined with mass spectrometry has been widely used in geology, environment, biology, materials, jewelry and other fields, especially in geology. There is a great demand for...

AI Technical Summary

Problems solved by technology

The traditional ablation cell will produce serious problems such as memory effect and element fractionation during the laser ablation process, which will eventually affect the transmission of aerosol and the accuracy of the analysis results

[0003] The interior of the conventional denudation pool is a whole cylindrical or cuboid space with an analysis volume of 100cm 3 -200cm 3 , the cleaning time after single-pulse ablation can be as long as 10s, and the analyte aerosol generated by laser ablation rotates repeatedly in the ablation pool, which is easy to contaminate the surface of other samples

Moreover, the different positions of the samples in a single large denudation cell will also produce inconsistent fractionation effects, which will affect the accuracy of the results.

Reducing the volume of the erosion cell can effectively reduce the cleaning time, but it will also inevitably affect the loading capacity of the sample, increase the frequency of sample replacement in the actual analysis process, and affect the efficiency and stability of the analysis

Although there are many types of denudation pools, the ones used in the testing of geological samples are simple in design, easy to operate, can obtain small position effects and memory effects, and there are still few single-volume denudation pools suitable for fixed-size single-mineral targets.

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