研究目的
To investigate the influence of laser wavelength on the detection of metals in Artemisia annua using laser-induced breakdown spectroscopy (LIBS).
研究成果
The 1064 nm laser induced plasmas with higher signal-to-background ratios and temperatures but lower electron densities compared to the 532 nm laser. The spectral intensities of ions were stronger than those of atoms for both laser wavelengths. The findings provide insights into the choice of experimental parameters for LIBS analysis of Artemisia annua and the mechanisms of laser-induced plasma formation.
研究不足
The study was conducted in open air at atmospheric pressure, which may affect plasma characteristics. The absence of certain spectral lines at longer delay times for the 532 nm laser limited the analysis of plasma temperature changes.
1：Experimental Design and Method Selection:
The study employed pulsed lasers operating at wavelengths of 1064 nm and 532 nm for LIBS to generate plasma. The spectral lines of Mg (II), CN, Ca (II), and Fe (II) were used to evaluate optical emission at various delay times.
2：Sample Selection and Data Sources:
Artemisia annua samples were purchased from the Chinese herbal medicine market in Chongqing, dried, ground, and pressed into pellets for analysis.
3：List of Experimental Equipment and Materials:
Q-switched Nd: YAG lasers (Q-smart 450 and Ultra 100), dual-order Nd:YAG laser mirror, dichroic mirror, quartz lenses, two-dimensional translation stage, Czerny–Turner spectrograph (Andor model SR-750A), and an ICCD camera.
4：Experimental Procedures and Operational Workflow:
The laser beams were focused onto the target, and the emitted light was collected and analyzed. The effects of data acquisition delay time on line intensity, signal-to-background ratio, and plasma characteristics were investigated.
5：Data Analysis Methods:
The plasma temperature and electron density were calculated using Boltzmann plots and Stark broadening of emission spectra, respectively.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
