Spectral stability improvement through wide fields of view collection optics in laser-induced breakdown spectroscopy applications

Literature Information

Publication Date 2023-11-01
DOI 10.1039/D3JA00270E
Impact Factor 4.023
Authors

Guangda Wang, Lianbo Guo, Shenglin Li, Zhenlin Hu


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Abstract

The shot-to-shot fluctuation of the line intensity is a significant challenge in LIBS applications. LIBS spectra are obtained by spatially integrating the inhomogeneous plasma emission with the spatial window of the collection optics. The field of view, the radial extent of the spatial window, plays a crucial role in LIBS spectra collection by determining the size of the plasma emission sampling region. However, the impact of the field of view on LIBS spectra remains to be fully understood. In this study, we provide collection models and field of view calculation formulae for three types of light collection optics used in LIBS: bare fiber, imaging, and Köhler. Different collection optics with varying fields of view gradients were designed to investigate the impact of the field of view on spectral signals. Using ray tracing algorithms, we simulated their respective collection geometries. Simulation results revealed an asymmetric diamond-shaped high-efficiency region for imaging, while bare fiber and Köhler exhibited a trapezoidal high-efficiency region with reduced chromatic aberration effects. Additionally, LIBS experiments were conducted with these collection optics. The experimental results demonstrated that the wide field of view collection optics can reduce shot-to-shot fluctuation of line intensity by 30–50% to around 5% compared with the narrow field of view collection optics. Moreover, the novel wide field of view collection method using Köhler optics obtains signals with low shot-to-shot fluctuation and the highest intensity by providing uniform and suitable fields of view across wide wavelength ranges.

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Journal of Analytical Atomic Spectrometry

Journal of Analytical Atomic Spectrometry
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The Journal of Analytical Atomic Spectrometry (JAAS) is the central journal for publishing innovative research on fundamentals, instrumentation, and methods in the determination, speciation and isotopic analysis of (trace) elements within all fields of application. This includes, but is not restricted to, the most recent progress, developments and achievements in all forms of atomic and elemental detection, isotope ratio determination, molecular analysis, plasma-based analysis and X-ray techniques. The journal welcomes full papers, communications, technical notes, critical and tutorial review articles, editorials, and comments, in addition to the Atomic Spectrometry Updates (ASU) literature reviews that are prepared by an expert panel. Submissions are welcome in the following areas, but note this list reflects the current scope and authors are strongly encouraged to contact the Editorial team if they believe that their work offers potentially new and emerging research relevant to the journal remit: Fundamental studies in the following. New and existing sources for atomic emission, absorption, fluorescence and mass spectrometry and those that provide both atomic and molecular information Sample introduction techniques for solids, liquids, gases Improvements in sensitivity, selectivity, precision, accuracy and/or robustness Isotope ratio measurements, including techniques for improving precision and mass bias correction Single channel and multichannel simultaneous detection systems Chemometrics, statistics, calibration techniques and internal standardisation Theoretical and numerical modelling of fundamental processes related to all of the above methodologies Novel or improved methodologies in areas of application including, but not limited to the following. Biosciences, including elemental, speciation and isotopic analysis in biological systems, immunoassays based on metal-labeled antibodies, bio-imaging, and nanoparticle toxicology Geochemistry Environmental science Materials science, including engineered nanoparticles and quantum dots Metrology, including reference materials Forensic analysis Food and agricultural sciences Energy Archaeometry Molecular analysis. Molecular sources for elemental and isotopic analysis Atomic sources for molecular analysis Atomic and molecular techniques simultaneously used for complementary chemical information All contributions are judged on originality and quality of scientific content, and appropriateness of length to content of new science.

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