Guo L B, Zhu Z H, Li J M, Tang Y, Tang S S, Hao Z Q, Li X Y, Lu Y F, Zeng X Y
Opt Express. 2018 Feb 5;26(3):2634-2642. doi: 10.1364/OE.26.002634.
Boron is an essential element for industry, but it is hard to accurately and rapidly determine high boron content with conventional laser-induced breakdown spectroscopy (LIBS), due to the matrix and self-absorption effect. Using molecular emission is an alternative method for boron content analysis, but its weak spectra are major challenges. Here, boron monoxide (BO) radicals were used to establish calibration assisted by LIBS and laser-induced radical fluorescence (LIBS-LIRF). Two types of BO radical excitations, vibrational ground state excitation (LIRFG) and vibrational excited state excitation (LIRFE), were compared. The results showed that LIRFG achieved better sensitivity with a limit of detection of 0.0993 wt.%, while the LIRFE was more accurate with a root mean square error of cross validation of 0.2514 wt.%. In conclusion, this work provided a potential approach for molecular emission analysis with LIBS-LIRF.
硼是工业的必需元素，但由于基体和自吸收效应，用传统的激光诱导击穿光谱法（LIBS）难以准确快速地测定高硼含量。利用分子发射是硼含量分析的一种替代方法，但其光谱较弱是主要挑战。在此，使用一氧化硼（BO）自由基，在LIBS和激光诱导自由基荧光（LIBS-LIRF）辅助下建立校准。比较了两种类型的BO自由基激发，即振动基态激发（LIRFG）和振动激发态激发（LIRFE）。结果表明，LIRFG具有更好的灵敏度，检测限为0.0993 wt.%，而LIRFE更准确，交叉验证的均方根误差为0.2514 wt.%。总之，这项工作为LIBS-LIRF分子发射分析提供了一种潜在方法。
