研究目的
Investigating the spectral characteristic of laser-induced plasma in soil under different time delays and irradiances, and analyzing the time evolution characteristics of plasma temperature and electron density.
研究成果
The spectral intensity of the characteristic lines decayed exponentially with time, with an average lifetime of nearly 1.56 μs. The spectral intensity of Pb Ⅰ: 405.78 nm increased linearly with laser energy, but the slope decreased exponentially with the increase of time delay. The plasma temperature and electron density decreased significantly within the range of 0–5 μs. These findings provide important insights for the determination of time delay in simultaneous measurement of multiple elements and understanding the spectral characteristic of plasma radiation.
研究不足
The study is limited to the spectral characteristic analysis of laser-induced plasma in soil under specific conditions of time delays and irradiances. The influence of other factors such as soil composition and laser parameters on the spectral characteristic is not thoroughly investigated.
1：Experimental Design and Method Selection:
Laser-induced breakdown spectroscopy (LIBS) was used to analyze the spectral characteristic of plasma under different time delays and irradiances. The plasma temperature was calculated by the Boltzmann plot method and the electron density was obtained by inversion of the full width at half maximum (FWHM) of the spectrum.
2：Sample Selection and Data Sources:
Two kinds of national standard soil (GBW-07405, GBW-07408) were used. Samples containing Pb were prepared by mixing the standard solution with national standard soil.
3：List of Experimental Equipment and Materials:
An Nd: YAG pulsed laser was used as the excitation source. The spectral signal was separated by a medium-step grating spectrometer and detected by ICCD.
4：Experimental Procedures and Operational Workflow:
The samples were measured five times under the condition of each time delay (with intervals of 0.5 μs). The spectra of each measurement were accumulated by 10 laser pulses.
5：5 μs). The spectra of each measurement were accumulated by 10 laser pulses.
Data Analysis Methods:
5. Data Analysis Methods: The spectral intensity was analyzed under different time delays and irradiances. The plasma temperature and electron density were calculated and their time evolution characteristics were discussed.
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
