激光诱导击穿铜特征谱线自吸收特性研究

发布时间：2018-06-29 14:48

本文选题：LIBS + 自吸收　；参考：《光谱学与光谱分析》2016年04期

【摘要】：应用Nd∶YAG脉冲激光器(532nm)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30~110mJ激光能量范围和触发后211~230μs时间范围内对Cu(Ⅰ)特征谱线324.754,327.396,510.554,515.324和521.320nm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5~20μs逐步消失;在50~100mJ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324.754,327.396nm和515.324,521.320nm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(324.754nm,1/2-3/2;521.320nm,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510.554nm(3d~(10)4p-3d~94s~2)在能量小于80mJ时自吸程度较低,持续时间较短;能量在80~100mJ范围内时自吸程度加大,持续时间变长。
[Abstract]:ND: YAG pulsed laser (532nm) was used as a light source to excite the TU0Cu sample. With grating spectrometer and ICCD as spectral line separation and detector, the self-absorption characteristics of Cu (I) characteristic line 324.754327.396510.554515.324 and 521.320nm are compared in the energy range of 30g 110mJ laser and 211230 渭 s after trigger. The results show that the self-absorption of the characteristic lines decreases with time, and disappears gradually after 50 渭 s, and in the energy range of 50 ~ 100mJ, the self-absorption degree increases and the duration becomes longer with the increase of laser energy. At the same time, the self-absorption characteristics of the characteristic lines are different due to the different transition energy levels of the spectral lines. The self-absorption degree of 324.754327.396nm and 515.324521.320nm lines with the same atomic configuration shows similar characteristics with the evolution of time and laser energy, and the self-absorption duration with energy, respectively. Moreover, the total angular momentum J is larger (324.754 nmg ~ (-1 / 2 / 2) / 521.320nmN ~ (2 / 2). The self-absorption degree of the spectrum line is relatively obvious, the duration is longer, and it is sensitive to the change of energy, and the degree of self-absorption is also larger with the change of energy. The spectral line 510.554nm (3d10 4p-3d~94s~2) has a lower degree of self-priming and a shorter duration when the energy is less than 80mJ, and when the energy is in the range of 80mJ, the self-priming degree increases and the duration becomes longer.
【作者单位】：沈阳理工大学理学院;
【基金】：国家自然科学基金项目(61378042)资助
【分类号】：TN249;O433

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