激光诱导铜等离子体中激发态4d′~4F_(9/2)的瞬态特性

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。

Instantaneous characteristics of atomic excited state 4d'4F9/2 in copper plasma induced by laser

The formation of copper excited state4d′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 state4d′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 state4d′4F9/2 transits to low energy states4p′4Do7/2 and4p′4Fo9/2 with the same probability. After 500 ns of plasma radiation, the collision becomes weak, and the excited state4d′4F9/2 mainly transits to4p′4Do7/2 with emitting the characteristic line Cu Ⅰ 359.91 nm.