期刊
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
卷 74-75, 期 -, 页码 38-45出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.sab.2012.06.034
关键词
Laser Induced Breakdown Spectroscopy; Local Thermodynamic Equilibrium; Calibration-free method; Copper-based alloy; Archeological finding
类别
The excitation temperature of Laser Induced Plasmas (LIPs) of copper-based alloys was determined with an alternative approach, which reverses the procedure of calibration-free methods for quantitative analysis through Laser Induced Breakdown Spectroscopy (LIBS). The inverse method here proposed is based on the Local Thermodynamic Equilibrium (LTE) equations, which were applied to simulate the elemental composition of certified samples at different temperatures, assuming that the actual plasma temperature was the one providing the best agreement with certified data. This procedure was validated for a set of bronze and brass standard samples and in different experimental conditions, by changing laser pulse width (7 ns and 250 fs) and laser wavelength (1064 nm, 532 nm and 355 nm). The temperature determined with the inverse method was then employed to determine the elemental composition of archeological findings of different copper-based alloys from Southern Italy sites (from VII century B.C. to VII A.D.), in order to test its validity for the analysis of actual unknown samples. The obtained weight percentages showed a good correlation with those obtained with the calibration line method, which provided a further confirmation of the assumptions made. (C) 2012 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据