期刊
TALANTA
卷 79, 期 2, 页码 388-395出版社
ELSEVIER
DOI: 10.1016/j.talanta.2009.03.066
关键词
LIBS; Self-absorption; Internal reference; Calibration-free quantitative analysis; Boltzmann plot
资金
- Chinese Academy of Sciences for Key Topics in Innovation Engineering [KGCX2-YW-126]
- National High-Tech Research and Development Program of China [2009AA04Z160]
A simplified procedure for correcting self-absorption effect was proposed in calibration-free laser-induced breakdown spectroscopy (CF-LIBS). In typical LIBS measurement conditions, the plasma produced is often optically thick, especially for the strong lines of major elements. The selection of self-absorption lines destroys the performance of CF-LIBS, and the familiar correction method based on the curve of growth is complex in implementation. The procedure we proposed, named internal reference for self-absorption correction (IRSAC), first chose an internal reference line for each species, then compared other spectral line intensity of the same species with the reference line to estimate the self-absorption degrees of other spectral lines, and finally achieved an optimal correction by a regressive algorithm. The self-absorption effect of the selected reference line can be ignored, since the reference line with high excitation energy of the upper level is slightly affected by the self-absorption. Through the IRSAC method, the points on the Boltzmann plot become more regular, and the evaluations of the plasma temperature and material composition are more accurate than the basic CF-LIBS. (C) 2009 Elsevier B.V. All rights reserved.
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