Experimental observation of dust ion acoustic wave propagation in a negative ion rich dusty plasma

In the present work nonlinear propagation of dust ion-acoustic (DIA) solitary waves (SWs) in a negative ion rich dusty plasma is experimentally investigated. The effect of negative ions on the formation of rarefactive solitary wave in a dusty double plasma device is observed and its characteristics are analyzed. The important observation in this work is that; for the present dusty plasma condition, the applied electric perturbation cannot form a train of rarefactive solitons while propagating, until a sufficient amount of negative ions is introduced into the dusty plasma. It is also observed that the viscosity in the dusty plasma plays a crucial role in the formation and dissipation of solitary waves. The velocity and width of the solitary waves are measured and compared with numerical results obtained from the Korteweg--de Vries (K-dV) Burgers equation.