期刊
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
卷 63, 期 10, 页码 999-1005出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.sab.2008.06.003
关键词
Laser Induced Breakdown Spectroscopy (LIBS) microprobe; Atomic Emission Spectrometry; Precision; Drift diagnosis and compensation; Shot-to-shot processing
类别
In order to set up the precision limit that can be reached with laser-induced breakdown spectrometry microprobe, a steel sample was scanned by using a 6-mu m diameter spot. Besides being close to the limit of the technique, such a spot diameter resulted in a small plasma size that minimized self-absorption effects. To minimize shot noise, Cr and Fe were used as test elements because of their high contents. Scan consisted of 25 successive matrices formed by 5 x 6 shots, i.e. a total of 750 shots. Results were studied as a whole, as well as between matrices and within matrices, to search for inhomogeneity. outliers and drift. Except a few outliers, the main contribution in the experimental RSD was the drift either within a matrix or between matrices. Drift attributed to laser warm up could be compensated for either by using a polynomial fitting or by using the other element. %RSD significantly below 2 were then obtained demonstrating that there is no penalty in terms of precision to perform laser microprobe using a series of single shots. (C) 2008 Elsevier B.V. All rights reserved.
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