FIZIKA B 5 (1996) 2, 73-84

EFFECTS OF NEGATIVE IONS ON THE ION-ACOUSTIC SOLITONS AND DOUBLE-LAYERS IN A RELATIVISTIC PLASMA

SAILENDRA N. PAUL, KALYAN K. MONDAL and ASESH ROYCHOWDHURY
Centre for Plasma Studies, Faculty of Science, Jadavpur University, Calcutta - 700032, India

Received 29 August 1995

Korteweg-de Vries equation for a relativistic plasma consisting of electrons, positive ions and negative ions has been derived using the reductive perturbation method for the study of ion-acoustic solitary waves. Near the critical density of negative ions for which the nonlinearity of Korteweg-de Vries equation vanishes, the modified Korteweg-de Vries equation has been derived. Formation of double layers is analysed from the mixed form of Korteweg-de Vries and modified Korteweg-de Vries equations. Profiles of ion-acoustic solitons and double layers are shown for the plasmas having (H⁺, Cl^-) ions, (H⁺, O^-) ions, (H⁺, SF₅^-) ions and (He⁺, SF₅^-) ions.

UDC 530.182
PACS 52.35.Sb, 52.60.+h

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