中国激光, 2019, 46 (8): 0802001, 网络出版: 2019-08-13   

激光诱导液相基质等离子体的空间演化特性 下载: 824次

Spatial Evolution Characteristics of Laser-Induced Plasma in Liquid Matrix
作者单位
1 安徽师范大学光电材料科学与技术安徽省重点实验室, 安徽 芜湖 241000
2 巢湖学院电子工程学院, 安徽 巢湖238000
摘要
为了揭示液相基质激光诱导击穿光谱(LIBS)与固相基质LIBS特性差异的产生机理,采用液体射流取样技术,利用脉冲激光烧蚀CrCl3水溶液产生激光等离子体,研究了等离子体中Cr元素发射光谱、等离子体电子温度和电子密度的空间演化特性。结果表明:相对于固相基质等离子体,液相基质激光等离子体存在明显不同的空间演化特性,在激光束传播方向上,等离子体可以沿着激光束传播方向膨胀至距离射流表面0.8 mm处;等离子体羽发光区域的线径较小,约为3.2 mm;离子谱线与原子谱线的峰值强度出现在不同位置,分别距离射流表面0.8 mm和0.4 mm;等离子体的电子温度低,电子密度值小,在激光束传播方向上两者的变化范围分别为2939~3611 K和0.0149×10 14~4.86×10 14 cm -3,且在离射流表面0.8 mm处达到最大值;与固相基质等离子体类似,液相基质等离子体的发射光谱、电子温度和电子密度的空间演化特性具有较好的空间对称性。
Abstract
In order to reveal the generation mechanistic of laser-induced breakdown spectroscopy characteristic difference between liquid and solid matrices, spatial evolution characteristics of Cr-element emission spectra, electron temperature, and electron density of the plasma generated via the pulsed laser ablation of a CrCl3 aqueous solution using liquid jet sampling technology are investigated. Results show that the laser-induced plasma in the liquid matrix has distinctly different spatial evolution characteristics compared with that in the solid matrix. Along the direction of the laser beam, the plasma can expand up to 0.8 mm away from the jet surface and the plasma plume has a small linear diameter of approximate 3.2 mm. Further, the maximum intensities of ionic and atomic spectral lines appear 0.8 mm and 0.4 mm away from the jet surface, respectively. Simultaneously, the electron temperature and electron density of the plasma are small and slightly vary within 2939-3611 K and (0.0149-4.86)×10 14 cm 3, respectively, along the laser beam direction. Maximum values are observed at 0.8 mm away from the jet surface. Similar to the solid-matrix plasma, the spatial evolution characteristics of plasma emission spectra, electron temperature, and electron density of the liquid-matrix plasma have good spatial symmetry.

余建立, 李乘, 姚关心, 杨新艳, 张先燚, 郑贤锋, 崔执凤. 激光诱导液相基质等离子体的空间演化特性[J]. 中国激光, 2019, 46(8): 0802001. Jianli Yu, Cheng Li, Guanxin Yao, Xinyan Yang, Xianyi Zhang, Xianfeng Zheng, Zhifeng Cui. Spatial Evolution Characteristics of Laser-Induced Plasma in Liquid Matrix[J]. Chinese Journal of Lasers, 2019, 46(8): 0802001.

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