Self-absorption effects of laser-induced breakdown spectroscopy under different gases and gas pressures  

作　　者：王崧宁 张殿鑫 陈楠 何亚雄 张红 柯川 许涛 陈永亮 赵勇 Songning WANG;Dianxin ZHANG;Nan CHEN;Yaxiong HE;Hong ZHANG;Chuan KE;Tao XU;Yongliang CHEN;Yong ZHAO(Superconductivity and New Energy R&D Center,Southwest Jiaotong University,Chengdu 610036,People's Republic of China;school of Physical Science and Technology,Southwest Jiaotong University,Chengdu 610036,People's Republic of China;School of Physics and Energy,Fujian Normal University,Fuzhou 350117,People's Republic of China)

机构地区：[1]Superconductivity and New Energy R&D Center,Southwest Jiaotong University,Chengdu 610036,People's Republic of China [2]school of Physical Science and Technology,Southwest Jiaotong University,Chengdu 610036,People's Republic of China [3]School of Physics and Energy,Fujian Normal University,Fuzhou 350117,People's Republic of China

出　　处：《Plasma Science and Technology》2023年第2期155-162,共8页等离子体科学和技术（英文版）

基　　金：National Key Research and Development Program of China(Nos.2017YFE0301306,2017YFE0301300,and 2017YFE0301506);Fujian Province Industrial Guidance Project(No.2019H0011).

摘　　要：The self-absorption effect is one of the main factors affecting the quantitative analysis accuracy of laser-induced breakdown spectroscopy.In this paper,the self-absorption effects of laserinduced 7050 Al alloy plasma under different pressures in air,Ar,and N2have been studied.Compared with air and N2,Ar significantly enhances the spectral signal.Furthermore,the spectral self-absorption coefficient is calculated to quantify the degree of self-absorption,and the influences of gas species and gas pressure on self-absorption are analyzed.In addition,it is found that the spectral intensity fluctuates with the change of pressure of three gases.It can also be seen that the fluctuation of spectral intensity with pressure is eliminated after correcting,which indicates that the self-absorption leads to the fluctuation of spectral intensity under different pressures.The analysis shows that the evolution of optical thin spectral lines with pressure in different gases is mainly determined by the gas properties and the competition between plasma confinement and Rayleigh–Taylor instability.

关 键 词：self-absorption coefficient ambient gases gas pressure laser-induced breakdown spectroscopy 

分 类 号：O657.3[理学—分析化学]