On the characteristics of the head-on collision between two ion thermal waves in isothermal pair-ion plasmas containing charged dust grains

The head-on collisions between two ion thermal solitary waves in isothermal pair-ion plasmas containing charged dust grains is investigated. Using the extended Poincaré–Lighthill–Kuo (PLK) method, the Korteweg–de Vries (KdV) equations and the analytical phase shifts after the head-on collision of two- solitary waves are derived. The results show that the number densities of positive and negative dust grains to the density of positive ion ratios and the negative-to-positive ion temperature ratio have strong effects on the phase shifts.

► The head-on collisions between two ion thermal solitary waves are investigated. ► The opposite polarities of charged dust grains modify the collision property of ITWs. ► The negative-to-positive ion temperature ratio has a significant influence on the phase shift.