Ionic plasmas in room-temperature atmospheric-pressure gases

Summary form only given. Ionic plasmas or negative ion plasmas, which have been observed in negative ion sources and in dry etching reactors with fluorinated gases, includes different transport processes from conventional plasmas composed of positive ions and electrons.1–3In comparison with the previous studies, we predict and examine ionic plasmas at atmospheric pressure in the gases very similar to the ambient air, in which electrons should almost diminish and ions suffer from heavy collisions against neutral atoms and molecules.