激光等离子体中铅原子谱线频移的空间演化  

Spatial Evolution of Energy Shift of Lead Atomic Spectrum in Laser Plasma

作　　者：周贤明 尉静 梅策香[1] 曾利霞[1] 张颖 张艳宁 ZHOU Xianming;WEI Jing;MEI Cexiang;ZENG Lixia;ZHANG Ying;ZHANG Yanning(School of Physics and Electronic Engineering,Xianyang Normal University,Xianyang 712000,Shaanxi,China;School of Science,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China)

机构地区：[1]咸阳师范学院物理与电子工程学院,陕西咸阳712000 [2]西安交通大学理学院,陕西西安710049

出　　处：《咸阳师范学院学报》2022年第4期9-14,共6页Journal of Xianyang Normal University

基　　金：国家自然科学基金项目(11505248,11775042,11875096);陕西省科技厅科研计划项目(2021JQ-812);陕西省教育厅科学研究计划项目(20JK0975)。

摘　　要：利用1064 nm的红外激光辐照铅靶,采集了激光能量20 mJ下铅激光等离子体在350~380 nm范围内发射光谱的时空演化谱。根据PbⅠ373.995 nm特征谱线的半高全宽计算了等离子体的电子密度,得到了电子密度随空间位置的演化趋势。分析了铅原子四条特征谱线(Pb I 357.274 nm、Pb I 363.958 nm、Pb I 368.348 nm、Pb I 373.995 nm)的中心波长随着延迟时间和空间位置的变化。结果发现,随着空间距离的增加,谱线的中心波长都向着短波的方向不断地移动。利用等离子体膨胀理论模型,从多普勒效应方面对实验结果进行了解释。The spatiotemporal evolution spectra of the laser induced breakdown spectrum in the range of 350~380 nm were collected for 1064 nm infrared laser irradiating the lead target with the incident energy of 20 mJ.The electron density of the plasma is calculated according to the full width at half maximum(FWHM)of the characteristic spectral line of Pb I 373.995 nm,and the evolution trend of the electron density with the space position is obtained.The central wavelengths of four characteristic spectral lines(Pb I 357.274 nm,Pb I 363.958 nm,Pb I 368.348 nm and Pb I 373.995 nm)of lead atom were analyzed as a result of delay time and space position.The results indicate that with the increase of space distance,the central wavelength of the spectral line moves towards the direction of short wave.The experimental result is explained from the aspect of Doppler effect by using the theoretical model of plasma expansion.

关 键 词：激光等离子体 光谱 电子密度 谱线频移 多普勒效应 

分 类 号：O433.1[机械工程—光学工程]