激光Al等离子体电荷态分布诊断研究  

Investigation on the charge-state distribution diagnosis of laser-produced Al plasmas

作　　者：曹世权 苏茂根 赵环昱[2] 张俊杰[2] 敏琦 孙对兄 何思奇 赵红卫[2] 董晨钟 CAO ShiQuan;SU MaoGen;ZHAO HuanYu;ZHANG JunJie;MIN Qi;SUN DuiXiong;HE SiQi;ZHAO HongWei;DONG ChenZhong(Key Laboratory of Atomic and Molecular Physics&Functional Material of Gansu Province,College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou 730070,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]西北师范大学物理与电子工程学院,甘肃省原子分子物理与功能材料重点实验室,兰州730070 [2]中国科学院近代物理研究所,兰州730000

出　　处：《中国科学：物理学、力学、天文学》2020年第6期101-106,共6页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家重点研发计划(编号:2017YFA0402300);国家自然科学基金(编号:11874051,11904293,61965015,11564037)资助项目。

摘　　要：本文分别利用光谱法和飞行时间法对真空环境中激光烧蚀产生的Al等离子体中离子的电荷态分布进行了诊断研究.利用时空分辨的光谱测量装置测量了激光Al等离子体极紫外波段的辐射光谱,通过光谱模拟诊断了等离子体中离子的电荷态分布,并分析了其演化行为.利用飞行时间装置测量获得了激光Al等离子体中离子的飞行时间谱,进一步诊断了等离子体中离子整体的电荷态分布.研究表明,光谱法能够诊断激光等离子体中离子的局部和瞬态的电荷态分布,飞行时间法能够诊断整体的电荷态分布,两种诊断方法相互补充,可以全面和准确地认识激光等离子体中离子的电荷态分布及其演化行为.Laser-produced plasmas(LPP)have been known to possess great application potential under extreme ultraviolet(EUV)lithography,soft X-ray micrography,and heavy ion accelerator,highly charged ion optical frequency standards,pulsed laser deposition,astrophysics and nuclear fusion.The applications in these fields require a clearer understanding of the evolutionary behavior of the LPP.However,LPP is neither homogeneous nor static during their expanding and cooling process,which involves complex physical processes.For a deep understanding of the LPP,many diagnostic methods and techniques have been developed,such as spectroscopy,fast imaging,time-of-flight(TOF),laser interferometry and Thomson scattering.Among these methods,spectroscopy has been the most widely used diagnostic method,which can be used to obtain relatively more state information.However,the diagnosis results of charge-state distribution obtained by spatio-temporally resolved spectroscopy are local and transient,and cannot therefore obtain the overall distribution.In order to have a more comprehensive understanding of charge-state distribution and its evolutionary behavior of the LPP,other diagnostic methods are needed.The TOF method is used for the measurement of highly charged ions of the LPP,which can be used to obtain the overall charge-state distribution information.Therefore,in this work,spectrometry and TOF method were used for the diagnosis of charge-state distribution of the LPP in a vacuum.The EUV emission spectra of laser-produced Al plasmas were measured by using spatio-temporally resolved laser-produced plasmas spectroscopy technique.The charge-state distributions with different delay times at the distance of 2.0 mm from target surface were diagnosed by spectral simulation and their evolution behavior were also analyzed.The TOF spectra of laser-produced Al plasmas were measured by the TOF method,and the overall charge-state distribution of ions in laser-produced Al plasmas was obtained.The results revealed that spectroscopy can diagnose the loc

关 键 词：激光等离子体 电荷态分布 光谱法 飞行时间法 

分 类 号：O53[理学—等离子体物理] TN24[理学—物理]