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Evaluation of the self-absorption reduction of minor elements in laser-induced breakdown spectroscopy assisted with laser-stimulated absorption
Journal of Analytical Atomic Spectrometry ( IF 3.4 ) Pub Date : 2017-08-21 00:00:00 , DOI: 10.1039/c7ja00199a
Jiaming Li 1, 2, 3, 4 , Yun Tang 1, 2, 3, 4 , Zhongqi Hao 1, 2, 3, 4 , Nan Zhao 1, 2, 3, 4 , Xinyan Yang 1, 2, 3, 4 , Huiwu Yu 1, 2, 3, 4 , Lianbo Guo 1, 2, 3, 4 , Xiangyou Li 1, 2, 3, 4 , Xiaoyan Zeng 1, 2, 3, 4 , Yongfeng Lu 1, 2, 3, 4
Affiliation  

Reducing self-absorption is one of the most important steps in achieving accurate analyses in laser-induced breakdown spectroscopy (LIBS). In this work, LIBS assisted with laser-stimulated absorption (LSA-LIBS) was used to reduce self-absorption effects in LIBS. A wavelength-tunable laser was used to resonantly excite cold atoms and reduce their amount in laser-induced plasmas, and thus fewer cold atoms at the plasma periphery re-absorb light from the plasma center. Accordingly, the self-absorption effect was reduced. Copper (Cu) and chromium (Cr) elements in steels were taken as examples to evaluate and compare the self-absorption effects in LIBS and LSA-LIBS. The results of calculated self-absorption coefficients (SAs) supported the effectiveness in reducing self-absorption and improving analytical linearity using LSA-LIBS.

中文翻译:

辅助激光激发吸收的激光诱导击穿光谱中微量元素的自吸收减少的评估

减少自吸收是在激光诱导击穿光谱法(LIBS)中实现准确分析的最重要步骤之一。在这项工作中,LIBS辅助了激光刺激吸收(LSA-LIBS),以减少LIBS中的自吸收作用。使用波长可调激光器来共振激发冷原子并减少其在激光诱导的等离子体中的数量,因此,等离子体外围处较少的冷原子会重新吸收来自等离子体中心的光。因此,自吸收作用降低。以钢中的铜(Cu)和铬(Cr)元素为例,评估和比较了LIBS和LSA-LIBS中的自吸收效应。计算的自吸收系数(SAs)的结果支持使用LSA-LIBS降低自吸收和改善分析线性的有效性。
更新日期:2017-09-11
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