摘要
Carbon is hard to be sensitively detected in laser-induced breakdown spectroscopy(LIBS).The optical emission can be significantly enhanced by resonantly exciting CN radicals in the plasma center using LIBS assisted with laser-induced fluorescence(LIBS-LIF).However,the nitrogen source for CN formation is provided by ambient gas.Therefore,we propose a new approach of periphery excitation in plasma to improve CN fluorescence.The optical and spatial characteristics of CN radicals in plasma were discussed.A fluorescence map was established by combining focal point location and fluorescent intensity,demonstrating that plasma periphery had 4.2 times stronger fluorescence than the center.
作者
Nan Zhao
Jiaming Li
Qiongxiong Ma
Liang Guo
Qingmao Zhang
赵楠;李嘉铭;马琼雄;郭亮;张庆茂(Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices,South China Normal University,Guangzhou 510631,China;Guangzhou Key Laboratory for Special Fiber Photonic Devices,South China Normal University,Guangzhou 510631,China;Guangdong Provincial Key Laboratory of Industrial Ultrashort Pulse Laser Technology,Shenzhen 518055,China)
基金
supported by the National Key Research and Development Program of China(No.2017YFB-1104500)
Key-Area Research and Development Program of Guangdong Province(No.2020B090922006)
Guangdong Basic and Applied Basic Research Foundation(No.2019A1515111120)
Science and Technology Program of Guangzhou(No.202002030165)
Featured Innovation Project of Guangdong Education Department(No.2019KTSCX034)
Young Innovative Talents Project in Universities of Guangdong Province(No.2018KQNCX057)
Young Scholar Foundation of South China Normal University(No.19KJ13)。
