In this paper, the quality assessment of isogams is demonstrated by laser-induced breakdown spectroscopy (LIBS) using the comparative standardization method. Here, the mass concentrations of carbon and hydrogen, as basic elements of tar, relative to that of calcium, as an undesired element, are taken into account as principal parameters to determine the quality of isogams. Hence, the intensity ratios of $${H}_{\alpha }$$ H α line of hydrogen (656.28 nm), the (0, 0) band of CN (388.34 nm), and the (0, 0) band of C 2 (516.52 nm) to the line intensity of once-ionized calcium (317.93 nm) are considered as determinant markers for five different pre-known isogam brands. Qualitatively, classification of the isogams based on this approach is in full agreement with that obtained from the results of Fourier-transform infrared (FTIR) spectroscopy. In FTIR spectra, two stronger transitions of 2849 cm −1 and 2917 cm −1 related to the symmetric and asymmetric stretching vibrations of C–H play the principal role in the analysis of samples. Furthermore, the results obtained from energy-dispersive X-ray (EDX) analysis quantitatively confirm the LIBS outcomes. And finally, to reveal the differences between isogams from various aspects, the linear discriminant analysis (LDA) is exploited as a statistical approach.

中文翻译：

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使用激光等离子体光谱快速评估同色异谱

在本文中，使用比较标准化方法通过激光诱导击穿光谱 (LIBS) 证明了对等角线的质量评估。在这里，作为焦油基本元素的碳和氢的质量浓度，相对于作为不想要的元素的钙的质量浓度，被考虑作为确定等格线质量的主要参数。因此，氢的$${H}_{\alpha }$$ H α 线（656.28 nm）、CN 的（0, 0）带（388.34 nm）和（0, 0）带的强度比C 2 (516.52 nm) 到一次电离钙 (317.93 nm) 的线强度被认为是五种不同的已知isogam 品牌的决定性标记。定性地，基于这种方法的同色异谱分类与从傅里叶变换红外 (FTIR) 光谱的结果中获得的分类完全一致。在 FTIR 光谱中，2849 cm -1 和 2917 cm -1 两个更强的跃迁与 C–H 的对称和非对称伸缩振动相关，在样品分析中起主要作用。此外，从能量色散 X 射线 (EDX) 分析获得的结果定量地证实了 LIBS 的结果。最后，为了从各个方面揭示 isogam 之间的差异，线性判别分析 (LDA) 被用作一种统计方法。