摘要
We present a non-contact optical investigation of laser-induced plasma at moderate Ar pressure ranging from 1 to 100 Pa.The significant shock front and spatial fractionation among the different charged ions are demonstrated at the pressure of 20 Pa.The collisions between Si IV ions and ambient Ar atoms generate distinct and excited ArⅡions,fresh SiⅢions,and electrons at the dense layer.The electron density peaks at the position of the shock front,indicating that the collision that yields electrons is dominant over the recombination process in the region of the shock layer and its immediate vicinity.
作者
彭新
陈敏孙
刘昊
Xin Peng;Minsun Chen;Hao Liu(College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,China;State Key Laboratory of Pulsed Power Laser Technology,Changsha 410073,China)
基金
supported in part by the National Natural Science Foundation of China(No.61805279)。