| dc.description.abstract | Dust acoustic wave (DAW) can be self excited at low pressure in the dusty plasma liquid due to some instabilities. Particle motions are directly observed and analyzed in DAW by a high speed micro image system with suitable illumination. We investigate their interactions and dynamics as a connection between macroscopic and microscopic pictures of the longitudinal wave. Various instabilities and collective behaviors can be self generated, such as DAW, or driven externally such as plasma bubble. In experiments, we can measure the global behaviors of the wave including spatiotemporal evolution of the particle number density, the spatial distribution of the power spectrum, phase space portrait, etc. In microscopic viewpoint, individual particle trajectories are traced in DAW to get its displacement and velocity. It is found that when the particle colliding the wave crest, it may be carried by the wave front and travels together for a short time or it may be repelled by the wave front and turns back. Most particles behave as long time aperiodic or quasi periodic chaotic motion instead of the simple harmonic motion. Particles oscillate in their potential wells may have opportunity to jump to nearby potential wells as the hopping motion. Furthermore, all particle trajectories are traced at the same time to study the velocity distribution of the particles in the wave. In another part of the experiment, the same methods are used to observe the spatiotemporal evolution and particle dynamics for pulsed laser ablation induced plasma bubble, i.e., spherical dust cavity. The collapsing plasma bubble can be considered as a downward propagating supersonic dust shock wave. Consequently, we further investigate some interesting phenomena such as the wave-bubble interactions and the induced dust wake field behind the bubble when plasma bubble traveling through DAW. | en_US |