Spectroscopic Characteristics of Plasma Plume Induced by Laser Ablation of WO3 Target

We report on the temporal and spatial resolved spectroscopic characteristics of the tungsten tri-oxide (WO3) plasma plume generated by Nd:YAG laser ablation. Emissions are dominated by mono-atomic neutral tungsten (W I), and there are no emission species such as W ions, 0 neutrals and molecular species. W I emission species move with high speed of 8.9 x103 m/s at the delay time (tau d) from 200 to 1000 ns after the laser irradiation. Two-dimentional images of expanding plasma plume were observed trough an ICCD camera.