研究目的
To analyze non-matrix matched metallic standards using laser ablation at kilohertz repetition rate coupled to laser-induced breakdown spectroscopy (kHz LA-LIBS) to overcome matrix effects and improve analytical performance.
研究成果
Kilohertz LA-LIBS demonstrated improved analytical performance over traditional LIBS and other LA-LIBS configurations for the analysis of non-matrix matched metallic standards. The technique achieved better signal-to-noise ratios, lower limits of detection, and more linear calibration curves. The use of an internal standard and background normalization further improved the analytical results. The study suggests that kHz LA-LIBS has potential applications in the analysis of geological materials and other samples where matrix effects are a challenge.
研究不足
The repeatability of the measurements was affected by the small sampling and analysis time, leading to higher relative standard deviation values. The design of the ablation and analysis chambers was not optimized for maximum transport efficiency.
1：Experimental Design and Method Selection:
The study utilized kHz LA-LIBS to separate the laser ablation process from the excitation and analysis stages. A kilohertz Nd:YLF laser was used for ablation, and a 5-Hz repetition rate Nd:YAG laser was used to create the analytical plasma.
2：Sample Selection and Data Sources:
Eight standard reference materials (SRMs) including four aluminum alloys, a high temperature alloy, a cupro-nickel alloy, a stainless steel, and a low alloy steel were analyzed.
3：List of Experimental Equipment and Materials:
A kilohertz Nd:YLF laser (527 nm wavelength, 227-ns pulse width), a Nd:YAG laser (1064 nm wavelength, 10 ns pulse width), ablation and analytical chambers, and a Czerny-Turner spectrometer with an ICCD camera for detection.
4：Experimental Procedures and Operational Workflow:
The ablation process was carried out with the kilohertz laser, and the ablated material was transported to the analytical chamber where it was excited by the Nd:YAG laser. LIBS spectra were acquired at steady-state condition.
5：Data Analysis Methods:
The signal-to-noise ratio, relative standard deviation, linearity, and y-intercept of calibration curves were estimated. Calibration plots were constructed using net, peak-to-background, and Fe-normalized intensities.
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