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Enhancement of Analytical Signal of Laser Induced Breakdown Spectroscopy by Deposition of Gold Nanoparticles on Analyzed Sample
摘要： Efficiency of LIBS signal enhancement by deposition of gold nanoparticles prepared by laser ablation in acetone on the surface of the analyzed sample has been studied. Characteristics of laser plasma generated on steel surface before and after deposition of the nanoparticles are compared. It is found that deposition of nanoparticles increases plasma volume and lifetime, but does not affect erosion of the material. Deposition of nanoparticles results in the enhancement of spectral lines intensities depending on the zone of the plasma plume selected for analysis: signal enhancement grows with distance from the sample.
关键词： nanoparticles,laser-induced breakdown spectroscopy,spectral line intensity
更新于2025-09-12 10:27:22
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Diode laser spectrometer for high-precision measurements
摘要： The issues of the development, calibration and putting into operation of a diode laser spectrometer for high-precision measurements are considered. The tests rely on the use of an isolated P20 line of the 00031 – 00001 band of the 12C16O2 molecule. The spectrometer error budget is analysed. A software programme for the approximation of a spectral line contour is designed and the procedure is analysed. It is shown that, for a baseline with a relative level of 2.3 ′ 10–5, it is optimal to use no more than six fitting parameters in the line contour approximation. The measured integral intensity of the analytical line constitutes 5.3865(85) ′ 10–23 cm per molecule.
关键词： diode laser,spectral line intensity,spectroscopy
更新于2025-09-12 10:27:22