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Observation of different regimes of the grain size effect on plasma emission induced by laser ablating granular materials
Journal of Analytical Atomic Spectrometry ( IF 3.4 ) Pub Date : 2021-07-15 , DOI: 10.1039/d1ja00115a
Yaju Li 1, 2 , Xiaolong Li 1, 2 , Songting Li 3 , Maoji Zhou 1, 2 , Dongbin Qian 1, 2 , Liangwen Chen 1, 2 , Jie Yang 1, 2 , Shaofeng Zhang 1, 2 , Xinwen Ma 1, 2
Affiliation  

The grain size effect on the plasma emission, induced by a 1064 nm laser pulse of 7 ns duration ablating the surface of a randomly packed granular (RPG) copper material in air at atmospheric pressure, was experimentally investigated in the laser fluence range of 12.4 to 35.4 J cm−2. Four sieved granular copper samples with discrete grain sizes of 297 ± 20, 218 ± 15, 132 ± 10, and 109 ± 5 μm were used in this study. The measured trends of the spectral line intensity emitted by copper versus the laser fluence for the four samples suggest the identification of three laser fluence ranges, where the size effect plays a different role. Combining the plasma parameters calculated through spectroscopic analysis, we interpreted the phenomenon of plasma emission by introducing one new kind of size effect stemming from the mechanical performance of RPG materials to support the shock pressure imparted by the energetic processes of plasma generation and expansion. Such an interpretation was also supported by additional photographic measurements of the particle ejecta and granular crater after laser ablation. The study has practical significance in developing the technology for direct analysis of RPG materials using laser-induced breakdown spectroscopy.

中文翻译:

观察晶粒尺寸对激光烧蚀颗粒材料引起的等离子体发射的不同机制

在 12.4 到 12.4 的激光能量密度范围内实验研究了由持续时间为 7 ns 的 1064 nm 激光脉冲在大气压力下烧蚀随机堆积的粒状 (RPG) 铜材料表面引起的等离子体发射的晶粒尺寸效应。 35.4焦厘米-2。本研究中使用了四个筛分的颗粒状铜样品,其离散粒度分别为 297 ± 20、218 ± 15、132 ± 10 和 109 ± 5 μm。铜发射的谱线强度的测量趋势四个样品的激光能量密度表明确定了三个激光能量密度范围,其中尺寸效应起着不同的作用。结合通过光谱分析计算的等离子体参数,我们通过引入一种源自 RPG 材料机械性能的新型尺寸效应来解释等离子体发射现象,以支持等离子体产生和膨胀的高能过程所赋予的冲击压力。这种解释也得到了激光烧蚀后粒子喷射物和粒子坑的额外摄影测量的支持。该研究对于开发利用激光诱导击穿光谱直接分析RPG材料的技术具有实际意义。
更新日期:2021-08-07
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