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基于正交预烧蚀双脉冲激光诱导击穿光谱(DP-LIBS) 技术对长春市四个地点地表土壤样品中的重金属元素进行了研究, 根据光谱线强度定性分析了重金属元素Mn, Cr, Cu, Pb含量.实验结果发现, 在532和1064 nm激光脉冲能量分别为70和100 mJ的条件下光谱增强随延时的变化出现双峰结构. 脉冲间延时20 μs时, Mn I 406.4 nm光谱增强幅度达到2.75倍, 延时为30 μs时出现第二个尖峰, 增强幅度为2.4倍.最后对正交预烧蚀DP-LIBS光谱增强机理进行了讨论.
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关键词:
- 预烧蚀 /
- 双脉冲激光诱导击穿光谱 /
- 光谱增强 /
- 土壤污染
The heavy metal elements contained in soil samples which are collected from Changchun train station, CUST campus, South Lake and Jingyue Lake park are separately analyzed by using the orthogonal dual laser pulses induced breakdown spectroscopy (DP-LIBS). The elements Mn, Cr, Cu and Pb are qualitatively analyzed according to the LIBS spectral intensity. It is shown that the intensity of the spectrum is greatly enhanced by using the DP-LIBS and the enhancement is closely related to the delay time between the double pulses. Enhancement variation with delay time presents double-peak changing when 532 nm and 1064 nm laser pulse energies are 70 mJ and 100 mJ respectively. The enhancement of Mn I 406.4 nm is 2.75 at a delay time of 20 s and it is 2.4 at a delay time of 30 s when the second peak appears. The enhancement mechanism of orthogonal pre-ablation DP-LIBS is further discussed.-
Keywords:
- pre-ablation /
- dual laser pulses induced breakdown spectroscopy /
- enhancement /
- soils pollution
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[11] Choi S C, Oh M K, Lee Y, Nam S, Ko D K, Lee J 2009 Spectrochim. Acta B 64 427
[12] Miziolek A W, Palleschi V, Schechter I 2006 Laser-Induced Breakdown Spectroscopy (LIBS): Fundamentals and Applications (Cambridge: Cambridge University Press)
[13] Rashid B, Ahmed R, Ali R, Baig M A 2011 Phys. Plasmas 18 073301
[14] Hugo S, Mayo V M, Rafael N G, Alejandro C R 2000 Appl. Phys. Lett. 77 3158
[15] Shen X K, Sun J, Ling H, Lu Y F 2007 Appl. Phys. Lett. 91 081501
[16] Guo L B, Hu W, Zhang B Y, He X N, Li C M, Zhou Y S, Cai Z X, Zeng X Y, Lu Y F 2011 Opt. Express 19 14067
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[1] Breeh F 1962 Appl. Spectrosc. 16 59
[2] Alexander D R, Poulain D E, Ahmad M U, Kubik R D, Cespedes E R 1994 IEEE 2 767
[3] Pandhijia S, Rai N K, Rai A K, Thakur S N 2010 Appl. Phys. B 98 231
[4] Dell’Aglio M, Gaudiuso R, Senesi G S, Giacomo A D, Zaccone C, Miano T M, Pascale O D 2011 J. Environ. Monitor. 13 1422
[5] Zheng Z K, Ma X H, Zhao H F, Yu L, Zhang M, Liao Y B 2009 Spectrosc. Spectr. Anal. 29 3383 (in Chinese) [郑泽科, 马晓红, 赵华凤, 于乐, 张敏, 廖延彪 2009 光谱学与光谱分析 29 3383]
[6] Lu Y, Wu J L, Li Y, Guo J J, Cheng K, Hou H M, Zheng R E 2009 Spectrosc. Spectr. Anal. 29 3121 (in Chinese) [卢渊, 吴江来, 李颖, 郭金家, 程凯, 侯华明, 郑荣儿 2009 光谱学与光谱分析 29 3121]
[7] Lu C P, Liu W Q, Zhao N J, Liu L T, Chen D, Zhang Y J, Liu J G 2011 Acta Phys. Sin. 60 045206 (in Chinese) [鲁翠萍, 刘文清, 赵南京, 刘立拓, 陈东, 张玉钧, 刘建国 2011 60 045206]
[8] Li K X, Zhou W D, Shen Q M, Ren Z J, Peng B J 2010 J. Anal. Atom. Spectrom. 25 1475
[9] Scaffidi J, Michael Angel S, David A 2006 Anal. Chem. 78 24
[10] Ahmed R, Baig A M 2009 J. Appl. Phys. 106 033307
[11] Choi S C, Oh M K, Lee Y, Nam S, Ko D K, Lee J 2009 Spectrochim. Acta B 64 427
[12] Miziolek A W, Palleschi V, Schechter I 2006 Laser-Induced Breakdown Spectroscopy (LIBS): Fundamentals and Applications (Cambridge: Cambridge University Press)
[13] Rashid B, Ahmed R, Ali R, Baig M A 2011 Phys. Plasmas 18 073301
[14] Hugo S, Mayo V M, Rafael N G, Alejandro C R 2000 Appl. Phys. Lett. 77 3158
[15] Shen X K, Sun J, Ling H, Lu Y F 2007 Appl. Phys. Lett. 91 081501
[16] Guo L B, Hu W, Zhang B Y, He X N, Li C M, Zhou Y S, Cai Z X, Zeng X Y, Lu Y F 2011 Opt. Express 19 14067
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