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首页> 外文期刊>Laser Physics: An International Journal devoted to Theoretical and Experimental Laser Research and Application >Laser-induced breakdown spectroscopic studies of calcite (CaCO3) marble using the fundamental (1064 nm) and second (532 nm) harmonic of a Nd:YAG laser
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Laser-induced breakdown spectroscopic studies of calcite (CaCO3) marble using the fundamental (1064 nm) and second (532 nm) harmonic of a Nd:YAG laser

机译：使用基础（1064nm）和第二（532nm）谐波的光源诱导的方解石（Caco3）大理石的击穿光谱研究：YD：YAG激光器

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摘要

Calcium is the fifth most abundant element in the Earth's crust and finds many applications in different fields of science and technology. Laser-induced breakdown spectroscopy (LIBS) was used for the analysis of naturally occurring calcite (CaCO3) marble at atmospheric pressure using the fundamental (1064 nm) and second (532 nm) harmonic of a Q-switched Nd:YAG laser. The emission spectra consist of neutral and singly ionized spectral lines of Ca and Mg, while traces of Al, Sr, and Na were also detected. The Ca lines were observed to dominate the shorter as well as longer wavelength regions and the 4s4d D-3(2) - 4s4p P-3(2) transition of Ca (I) at 445.74 nm possessed higher intensity than any other spectral line in the observed spectra. An increase in the signal intensity of the spectral lines was noted with the increase in laser pulse energy. The relative abundance of the pertinent elements was determined by integrated intensities of the strongest lines, and integrated intensities of all lines from each element and the result was 79.74% Ca and 15.49% Mg, revealing them as major constituting elements. The results of the LIBS technique agreed with the outcomes of the same sample studied for microchemical analysis using an electron probe micro analyzer coupled with energy dispersive x-ray spectroscopy. Self-absorption was noted for a doublet of singly ionized Ca (II) line at 397.1 nm. The experimentally observed integrated line intensities of six Ca (I) lines at 364.53, 443.80, 458.86, 526.18, 616.83, and 650.04 nm were used to extract the electron temperature (T-e) using the Boltzmann plot method. The electron number density (N-e) was determined from the Stark broadening profile of a neutral Ca (I) line at 504.37 nm. The values of T-e and N-e at a 0.05 mm distance from the target surface with a pulse energy of 40 mJ were found to be 8500 K and 3.53 x 10(16) cm(-3) for the 1064 nm laser. The same parameters were observed to be 6800 K and 3.87 x 10(16) cm(-3) for th
机译：钙是地壳中的第五个最丰富的元素，在不同的科学和技术领域中发现了许多应用。使用基本（1064nm）和Q开关Nd：YAG激光器的基本（1064nm）和第二（532nm）谐波，激光诱导的击穿光谱（Libs）用于在大气压下在大气压下进行天然存在的方解石（CaCO 3）大理石。发射光谱由Ca和Mg的中性和单电离光谱线组成，而Al，Sr和Na的痕量也被检测到。观察到Ca线以缩短较短的波长区域和4S4D D-3（2） - ＆GT; 4S4P P-3（2）Ca（I）的转变在445.74nm处具有比观察到的光谱中的任何其他光谱线更高的强度。随着激光脉冲能量的增加，注意到光谱线的信号强度的增加。相关元素的相对丰度是通过最强线的综合强度确定的，并且来自每个元素的所有线条的整合强度为79.74％Ca和15.49％Mg，揭示它们作为主要构成元素。 Libs技术的结果与使用与能量分散X射线光谱相连的电子探针微分析仪研究了用于微型化学分析的相同样本的结果。在397.1nm处的单独电离Ca（II）管线的双电离Ca（II）管线注明自吸收。通过Boltzmann绘图方法使用实验观察到364.53,443.80,458.86,526.18,616.83和650.04nm的六个Ca（i）线的综合线强度用于提取电子温度（T-E）。电子数密度（N-E）由504.37nm处的中性Ca（I）管线的STARK展现曲线测定。对于1064nm激光，发现距目标表面为0.05mm的距离脉冲能量为0.05mm的脉冲能量为0.05mm的距离为0.05mm，为8500k和3.53×10（16）厘米（-3）。观察到相同的参数为6800 k和3.87×10（16）厘米（-3）

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