Emission spectroscopic monitoring of particle composition, size and transport in laser ablation inductively coupled plasma spectrometry
Emission spectroscopic monitoring of particle composition, size and transport in laser ablation inductively coupled plasma spectrometry
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DOI：
10.1016/j.sab.2006.03.001
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发表时间：
2006-03
期刊：
影响因子：
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通讯作者：
M. Miclea;C. C. Garcia-C.;I. Exius;H. Lindner;K. Niemax
中科院分区：
文献类型：
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作者：
M. Miclea;C. C. Garcia-C.;I. Exius;H. Lindner;K. Niemax
用快速光电倍增管同时测量了由正交预脉冲激光烧蚀黄铜产生的原子化颗粒中铜和锌的光谱线发射，这些原子化颗粒从烧蚀池通过管传输到ICP中。结果表明，同时在线监测的主要元素提供的信息不仅在激光烧蚀ICP光谱的气溶胶传输，但也对小到单个较大的颗粒和它们各自的元素组成的比例，因此，在可能的元素分馏问题。此外，光谱信息可以很容易地用于适当调整激光能量密度，以最大限度地减少大颗粒的产生，以提高传输效率，并减少在激光烧蚀ICP光谱分析的分析信号的噪声。正交预脉冲激光烧蚀黄铜的实验证实了这种双脉冲排列产生主要超细颗粒的最新发现。可以分析直径≤ 250 nm的单个黄铜颗粒。正如预期的那样，它们显示出大量的锌消耗。最后，强积累的气溶胶粒子被发现在烧蚀细胞中使用，即使在低激光脉冲频率。
The spectroscopic line emissions of copper and zinc from atomized particles generated by orthogonal pre-pulse laser ablation of brass and transported from the ablation cell through tubes into an ICP have been simultaneously measured end-on with fast photomultipliers. It was shown that simultaneous line monitoring of major elements provides not only information on the aerosol transport in laser ablation ICP-spectrometry, but also on the ratios of small to single larger particles and their respective elemental compositions and, therefore, on possible elemental fractionation problems. Furthermore, the spectroscopic information can be easily exploited for proper adjustment of the laser fluence in order to minimize the production of large particles, to improve the transport efficiency and to reduce the noise of analytical signals in laser ablation ICP-spectrometry. The present particular experiment on orthogonal pre-pulse laser ablation of brass confirms the recent finding that such kind of double-pulse arrangement produces predominantly ultra-fine particles. Individual brass particles with diameters ≳250 nm could be analyzed. They showed large Zn depletions as expected. Finally, strong accumulations of aerosol particles were found in the ablation cell used even at low laser pulse frequencies.