Explosion dynamics of dusty plasma liquids induced by laser ablation on suspended dust particles

摘要

Dusty plasma liquids can be formed by suspending negatively charged micrometer sized dust particles in a low pressure glow discharge. We investigate the dynamical behaviors of the expanding plume generated by the ablation on one of the suspended particles using a focused nanosecond pulsed laser, through monitoring the white light emission intensity and dust particle trajectories. In the initial 10 μs, the diameter of the expanding plume scales as D∝P~(-0.37)t~(0.31), where P is the background pressure. The surrounding dust particles start to be driven away radially after tens of microseconds. The diameter of the expanding cavity (plasma bubble) with dust depletion scales as D∝t~(0.33).