光谱学与光谱分析, 2016, 36 (4): 1175, 网络出版: 2016-12-20   

激光诱导击穿铜特征谱线自吸收特性研究

Study on Self-Absorption Properties in Laser Induced Breakdown Spectroscopy from Copper Sample
作者单位
沈阳理工大学理学院, 辽宁 沈阳 110159
摘要
应用Nd∶YAG脉冲激光器(532 nm)作为光源, 诱导激发TU0Cu样品。 以光栅光谱仪和ICCD为谱线分离与探测器件, 在30~110 mJ激光能量范围和触发后211~230 μs时间范围内对Cu(Ⅰ)特征谱线324.754, 327.396, 510.554, 515.324和521.320 nm的自吸收特性进行比较研究。 研究表明, 特征谱线自吸现象随时间增加逐渐减弱, 经过5~20 μs逐步消失; 在50~100 mJ能量范围内, 随着激光能量的增大, 谱线的自吸收程度增加, 持续时间变长。 同时特征谱线的自吸收特性因谱线跃迁能级状态不同而存在差异, 具有相同原子组态的324.754, 327.396 nm和515.324, 521.320 nm两组谱线的自吸收程度随时间和激光能量的演变以及自吸持续时间随能量的变化都分别表现出相似的特征, 且总角动量J较大(324.754 nm, 1/2-3/2; 521.320 nm, 3/2-5/2)的谱线自吸收程度相对明显, 持续时间较长, 受能量变化影响敏感, 自吸收程度随能量变化幅度也较大。 谱线510.554 nm(3d104p-3d94s2)在能量小于80 mJ时自吸程度较低, 持续时间较短; 能量在80~100 mJ范围内时自吸程度加大, 持续时间变长。
Abstract
In this paper, a Nd∶YAG laser with an operating wavelength of 532 nm was employed to generate plasmas of TU0 copper sample on the surface. With grating spectrograph and intensified charge coupled device(ICCD) as spectroscopy analysis detection equipment, self-absorption properties of five atomic lines of Cu(Ⅰ) with wavelengths of 324.754, 327.396, 510.554, 515.324 and 521.320 nm have been studied and compared with observation time from 211 to 300 μs after the trigger and laser energy from 30 to 100 mJ. The result indicates that the extents of self-absorption of atomic lines decrease with increasing observation time and after a period of time of 5 to 20 μs the self-absorption cannot be observed; with the increase of laser energy ranging from 50 to 100 mJ, the self absorption shows an increase of extents and duration. Meanwhile the self-absorption properties differ due to different energy-level states of atomic spectrum line transition. Changes of self-absorption extents with observation time and energy and of self-absorption duration with energy exhibit similar characteristics for the two groups of lines range from 324.754 to 327.396 nm and 515.324 to 521.320 nm, respectively, with the same atomic configuration. Moreover, the extents of self-absorption at spectral lines with large angular momentum (324.754 nm, 1/2-3/2 and 521.320 nm, 3/2-5/2) are more sensitive to change of the laser energy with a higher value of extent change and a longer duration. In comparison, the self-absorption of spectral line 510.554 nm (3d104p-3d94s2) has low extent and short duration when laser energy is below 80 mJ, and the extent increases and the duration becomes longer for the energy range from 80 to 100 mJ.

徐送宁, 段文钊, 宁日波, 李倩, 艾卓, 姜冉. 激光诱导击穿铜特征谱线自吸收特性研究[J]. 光谱学与光谱分析, 2016, 36(4): 1175. XU Song-ning, DUAN When-zhao, NING Ri-bo, LI Qian, AI Zhuo, JIANG Ran. Study on Self-Absorption Properties in Laser Induced Breakdown Spectroscopy from Copper Sample[J]. Spectroscopy and Spectral Analysis, 2016, 36(4): 1175.

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