Electrostatic solitary waves in dusty pair-ion plasmas

Abstract

The propagation of electrostatic waves in an unmagnetized collisionless pair-ion plasma with immobile positively charged dusts is studied for both large- and small-amplitude perturbations. Using a two-fluid model for pair-ions, it is shown that there appear two linear ion modes, namely the "fast" and "slow" waves in dusty pair-ion plasmas. The properties of these wave modes are studied with different mass $(m)$ and temperature $(T)$ ratios of negative to positive ions, as well as the effects of immobile charged dusts $(\delta )$. For large-amplitude waves, the pseudopotential approach is performed, whereas the standard reductive perturbation technique (RPT) is used to study the small-amplitude Korteweg-de Vries (KdV) solitons. The profiles of the pseudopotential, the large amplitude solitons as well as the dynamical evolution of KdV solitons are numerically studied with the system parameters as above. It is found that the pair-ion plasmas with positively charged dusts support the propagation of solitary waves (SWs) with only the negative potential. The results may be useful for the excitation of SWs in laboratory dusty pair-ion plasmas, electron-free industrial plasmas as well as for observation in space plasmas where electron density is negligibly small compared to that of negative ions.

14 pages, 11 figures; To appear in Physics of Plasmas (2013); Citations for figures 8 to 11 are rectified in the revised version

References in corpus (1)

• Ion-acoustic solitary waves and shocks in a collisional dusty negative ion plasma

Cited by in corpus (7)

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• Oblique propagation of dust ion-acoustic solitary waves in a magnetized dusty pair-ion plasma
• Landau damping effects on dust-acoustic solitary waves in a dusty negative-ion plasma
• Landau damping of Gardner solitons in a dusty bi-ion plasma
• Complex Korteweg-de Vries equation and Nonlinear dust-acoustic waves in a magnetoplasma with a pair of trapped ions
• Large amplitude electromagnetic solitons in a fully relativistic magnetized electron-positron-pair plasma