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In an unbounded, collisionless and unmagnetized plasma consisting of positive and negative ions together with non-thermal electrons, first and second order amplitudes and widths of the ion-acoustic solitary waves are discussed here properly along with the effect of the concentration of negative ion and temperature of both positive and negative ions.

In single and two-temperature non-isothermal electron plasma along with warm positive ion, warm negative ion and warm positron, propagation of non-linear ion-acoustic solitary waves are investigated under the variation of different plasma parameters. In this paper, we have studied the first, second and third order compressive non-linear solitary wave solutions along with their respective amplitudes by a very familiar approach known as 'tanh -method' with existence condition for solitary wave solutions. Again we are trying to compare the amplitudes between isothermal and non-isothermal two-temperature electron plasma. In addition to this, for two-temperature non-isothermal electron plasma -variation of energy connected with those amplitudes, fast and slow ion-accoustic phase velocity and profiles of Sagdeev potential for temperature variation of positive and negative ions are critically discussed. All the results obtained are represented graphically.

In an unbounded, collisionless and unmagnetized plasma consisting of positive and negative ions together with non-thermal electrons, first and second order amplitudes and widths of the ion-acoustic solitary waves are discussed here properly along with the effect of the concentration of negative ion and temperature of both positive and negative ions.