摘要
利用时间分辨光谱技术,研究了激光诱导Cu等离子体中激发态4d′4F9/2的形成及其辐射跃迁的瞬态特性。结果表明:电子离子复合、粒子间碰撞、自蚀吸收等过程在等离子体不同演化时刻,对激发态4d′4F9/2原子的制备起着不同作用。粒子间碰撞作用剧烈时,激发态4d′4F9/2原子以相同几率向低能态4p′4Do7/2及4p′4Fo9/2跃迁转移能量;等离子体辐射约500 ns后,粒子间相互作用变弱,激发态4d′4F9/2原子主要通过辐射谱线CuⅠ359.91 nm转移能量。
The formation of copper excited state 4d′ 4F9/2 and its transition in the copper plasma induced by laser are studied by the time-resolved spectra technology.The experimental results indicate that the formation of excited state 4d′ 4F9/2 follows different mechanisms,such as recombination of electrons and ions,collision between the elemental species and self-absorption of atomic lines,during the evolution of plasma.When the collision between particles is severe,the excited state 4d′ 4F9/2 transits to low energy states 4p′ 4Do7/2 and 4p′ 4Fo9/2 with the same probability.After 500 ns of plasma radiation,the collision becomes weak,and the excited state 4d′ 4F9/2 mainly transits to 4p′ 4Do7/2 with emitting the characteristic line Cu Ⅰ 359.91 nm.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2010年第11期2741-2744,共4页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(10974010)
北京市科技创新平台项目(1010005466903)
2009年北京工业大学博士创新计划项目
