Kurek Lauren, Najarian Maya L, Cremers David A, Chinni Rosemarie C
Department of Math and Sciences, Alvernia University.
J Vis Exp. 2013 Sep 23(79):e50876. doi: 10.3791/50876.
The dependence of some LIBS detection capabilities on lower pulse energies (<100 mJ) and timing parameters were examined using synthetic silicate samples. These samples were used as simulants for soil and contained minor and trace elements commonly found in soil at a wide range of concentrations. For this study, over 100 calibration curves were prepared using different pulse energies and timing parameters; detection limits and sensitivities were determined from the calibration curves. Plasma temperatures were also measured using Boltzmann plots for the various energies and the timing parameters tested. The electron density of the plasma was calculated using the full-width half maximum (FWHM) of the hydrogen line at 656.5 nm over the energies tested. Overall, the results indicate that the use of lower pulse energies and non-gated detection do not seriously compromise the analytical results. These results are very relevant to the design of field- and person-portable LIBS instruments.
使用合成硅酸盐样品研究了一些激光诱导击穿光谱(LIBS)检测能力对较低脉冲能量(<100 mJ)和时间参数的依赖性。这些样品用作土壤模拟物,包含在土壤中常见的各种浓度的微量元素和痕量元素。在本研究中,使用不同的脉冲能量和时间参数制备了100多条校准曲线;从校准曲线确定检测限和灵敏度。还使用玻尔兹曼图测量了各种能量和测试时间参数下的等离子体温度。在测试的能量范围内,利用656.5 nm处氢线的半高全宽(FWHM)计算等离子体的电子密度。总体而言,结果表明使用较低脉冲能量和非选通检测不会严重影响分析结果。这些结果与现场和便携式LIBS仪器的设计密切相关。