Electron-ion relaxation time dependent signal enhancement in ultrafast double-pulse laser-induced breakdown spectroscopy

被引：35
作者：
Harilal, S. S. [1 ]
Diwakar, P. K. [1 ]
Hassanein, A. [1 ]
机构：
[1] Purdue Univ, Sch Nucl Engn, Ctr Mat Extreme Environm, W Lafayette, IN 47907 USA
来源：
APPLIED PHYSICS LETTERS | 2013年 / 103卷 / 04期
关键词：
ABLATION; LIBS;
D O I：
10.1063/1.4816348
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We investigated the emission properties of collinear double-pulse compared to single-pulse ultrafast laser induced breakdown spectroscopy. Our results showed that the significant signal enhancement noticed in the double pulse scheme is strongly correlated to the characteristic electron-ion relaxation time and hence to the inter-pulse delays. Spectroscopic excitation temperature analysis showed that the improvement in signal enhancement is caused by the delayed pulse efficient reheating of the pre-plume. The signal enhancement is also found to be related to the upper excitation energy of the selected lines, i.e., more enhancement noticed for lines originating from higher excitation energy levels, indicating reheating is the major mechanism behind the signal improvement. (C) 2013 AIP Publishing LLC. [http://dx.doi.org/10.1063/1.4816348]
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页数：4
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