| 光谱学与光谱分析 |
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| Time-Resolved Evaluation of Self-Absorption in Laser Induced Plasma from Nickel Sample |
| HOU Hua-ming, LI Ying, LU Yuan, WANG Zhen-nan, ZHENG Rong-er* |
| Optics & Optoelectronics Laboratory, Ocean University of China, Qingdao 266100, China |
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Abstract Laser induced breakdown spectroscopy (LIBS) has been shown to be a promising technique for element analysis. However, self-absorption effect deeply influences the LIBS measurements. In the present paper, a Q-switched Nd∶YAG laser operated at 1 064 nm was used to generate nickel plasmas in air. Four atomic lines Ni Ⅰ 341.476/351.034/351.505/352.454 nm which belong to the same electronic configuration (3d9(2D)4p—3d9(2D)4s) of Ni were chosen for self-absorption investigation. Self-absorption of Ni Ⅰ 351.034 nm corresponding to the highest energy level 3D1 of 3d9(2D)4s was not observed in the plasma emission investigated. While for the other three lines, a strong self-absorption appeared at the prophase of the plasma and tended to weaken. The self-absorption at Ni Ⅰ 352.454 nm was the most serious and still visible at the delay of 1 100 ns, compared with the lines of Ni Ⅰ 341.476/351.505 nm whose self-absorption duration is 900 and 500 ns respectively. It was also found that the self-absorption effect had power dependence and decreased with the increase in laser pulse energy. The obtained results suggest that the self-absorption effect could be alleviated by suitable atomic line selection, operating at a higher pulse energy and detecting with a longer delay. The possible reasons for the self-absorption duration difference for different lines were also discussed.
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Received: 2010-02-26
Accepted: 2010-05-29
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Corresponding Authors:
ZHENG Rong-er
E-mail: rzheng@ouc.edu.cn
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