激光诱导击穿光谱技术是一种新型的原子光谱分析技术,具有实时快速、多元素同时分析和样品预处理简单等特点,从一出现便受到研究人员的广泛关注,但分析灵敏度差一直是限制该技术发展的重要因素.基于共振激发的激光诱导击穿光谱技术将原子荧光光谱技术和激光诱导击穿光谱技术结合,对目标元素进行选择性激发,可以大幅提高激光诱导击穿光谱技术的分析灵敏度,极大地拓展了LIBS技术在痕量元素检测领域的应用.本文综述了基于共振激发的激光诱导击穿光谱技术的研究进展,介绍了激光诱导等离子体中荧光光谱的产生过程以及基于共振激发的激光诱导击穿光谱技术的基本类型和基础原理,详细分析了烧蚀激光能量、共振激发激光能量和波长、烧蚀激光和共振激发激光之间的延时以及光谱采集门宽对光谱增强效果的影响,阐述了其在冶金、环境监测、同位素检测等领域的应用现状和存在的问题,并对其未来发展前景进行了展望。

Laser-induced breakdown spectroscopy(LIBS),a new kind of atomic spectrum analysis technology,has attracted much attention of the researchers due to its characteristics of real-time,simultaneous multi-element analysis,and no sample preparation.However,the poor analytical sensitivity has been an important factor that restricts the development of this technology.LIBS based on resonance excitation combines atomic fluorescence spectroscopy and laser-induced breakdown spectroscopy and selectively excites the target elements.In this way,the analytical sensitivity of LIBS can be improved substantially and its application for trace elements detection is greatly expanded.In this paper,the research development of LIBS based on resonance excitation is summarized.The generation of atomic fluorescence spectrum in laser-induced plasma,the typical classification and the basic principle of LIBS based on resonance excitation are introduced.The influence of ablation laser energy,resonant laser energy and wavelength,delay between the ablation laser and the resonant laser,and the gate width on spectral enhancement are analyzed in detail.The application status and deficiencies of LIBS based on resonance excitation in the fields of metallurgy,environmental monitoring and isotope detection are elaborated.Future prospects of LIBS based on resonance excitation are also described.