Laser-Induced Breakdown Spectroscopy
Laser-Induced Breakdown Spectroscopy
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DOI：
10.1201/b11497-5
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
H. Telle;Á. G. Ureña
中科院分区：
文献类型：
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作者：
H. Telle;Á. G. Ureña
激光诱导击穿光谱（LIBS）是一种原子发射光谱。当原子处于高能状态时，原子会从低能级激发到高能级。常规的激发能源可以是热火焰、光或高温等离子体。将原子保持在较高能级的激发能将被释放，原子最终返回到基态。特定激发原子的释放能量是明确定义的，并且该特征过程利用发射光谱法进行分析。 LIBS 利用激光脉冲使样品原子化并导致原子发射。与传统的火焰发射光谱法相比，LIBS 通过聚焦激光脉冲仅雾化样品的一小部分，从而在样品上产生微小的火花。由于火花发射的寿命很短，捕获瞬时光是收集足够强度的发射物质的一项主要技能。 LIBS 系统的三个主要部分是脉冲激光器、样品和光谱仪。通常需要控制系统来管理定时和频谱捕获。图 1 说明了传统 LIBS 中的这三个主要组件和一台计算机。
Laser-induced breakdown spectroscopy (LIBS) is an atomic emission spectroscopy. Atoms are excited from the lower energy level to high energy level when they are in the high energy status. The conventional excitation energy source can be a hot flame, light or high temperature plasma. The excited energy that holds the atom at the higher energy level will be released and the atom returns to its ground state eventually. The released energy is welldefined for the specific excited atom, and this characteristic process utilizes emission spectroscopy for the analytical method. LIBS employs the laser pulse to atomize the sample and leads to atomic emission. Compared to the conventional flame emission spectroscopy, LIBS atomizes only the small portion of the sample by the focused laser pulse, which makes a tiny spark on the sample. Because of the short-life of the spark emission, capturing the instant light is a major skill to collect sufficient intensity of the emitting species. Three major parts of the LIBS system are a pulse laser, sample, and spectrometer. Control system is usually needed to manage timing and the spectrum capturing. Figure 1 illustrates those three major components and a computer in the conventional LIBS.