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An alternative explanation to the mechanism behind self-sustainedoscillations of ions in direct current (DC) glow discharges is provided. Suchdescription is distinguished from the one provided by the fluid models, whereoscillations are attributed to the positive feedback mechanism associated withphotoionization of particles and photoemission of electrons from the cathode.Here, oscillations arise as consequence of interaction between an ion and thesurface charges induced by it at the bounding electrodes. Such mechanismprovides an elegant explanation to why self-sustained oscillations occur onlyin the negative resistance region of the voltage-current characteristic curvein the DC glow discharges. Furthermore, this alternative description providesan elegant explanation to the formation of plasma fireballs in the laboratoryplasma. It has been found that oscillation frequencies increase with ion'ssurface charge density, but at the rate which is significantly slower than itdoes with the electric field. The presented mechanism also describesself-sustained oscillations of ions in dusty plasmas, which demonstrates thatself-sustained oscillations in dusty plasmas and DC glow discharges involvecommon physical processes.

Mechanism behind self-sustained oscillations in direct current glow discharges and dusty plasmas