Head-on collisional effects of ion acoustic waves in pair-ion plasma: topological and non-topological solitons

Abstract

The phenomena concerning head-on collision between the two topological and non-topological solitons are investigated in unmagnetized and collisionless plasma system consisting of weakly relativistic cold positive ( $$H^{+}$$ , $${Xe}^{+}$$ and $$K^{+}$$ ) and negative ( $$H^{-}$$ , $${SF}_{6}^{-}$$ , $$O_{2}^{-}$$ and $$C_{7}F_{14}^{-}$$ ) ion species with superthermal electrons. To do this, the two-sided Korteweg–de Vries (KdV) equations are derived using extended Poincare–Lighthill–Kue method. The solutions of KdV equations are obtained by solitary ansatz technique. Productions as well as collisional effects of non-topological and topological solitons are investigated taking the experimentally obtained plasma parameters into accounts. The study reveals that the nonlinearity of non-topological solitons become more pronounced for $$K^{+}-C_{7}F_{14}^{-}$$ plasma as compared to the other ionic species plasmas. The masses and densities of negative ion species play a vital role on the potential profiles of topological solitons. A new type large amplitude wave is produced in the colliding region due to collision depending on plasma parameters.