COLLISIONAL INSTABILITIES IN A DUSTY PLASMA WITH RECOMBINATION AND ION-DRIFT EFFECTS

Instabilities of dust acoustic waves in a plasma with a significant ba ckground pressure of neutrals have been investigated. A long wavelengt h mode is found to be unstable due to recombination of electrons and i ons on the surface of dust particles. At short wavelengths, a dissipat ive instability driven by relative drift between ions and the dust par ticles is found to be important. Nonlinearly, the short wavelength mod es lead to the formation of K - dV solitons whereas the long wavelengt h end is dominated by modulational instabilities.