Experiments on the propagation and collision of a Korteweg-deVries soliton in a positive ionnegative ion plasma are described. Both a one-dimensional overtaking collision and a twodimensional resonant collision are examined. Soliton propagation into a steady-state plasma sheath created by an additional biased metal plate in such a plasma is large enough that the detailed soliton motion in the locally inhomogeneous plasma can be easily studied. A partial reflection and partial transmission of the soliton at a critical density within the sheath is observed and interpreted.

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Experimental observations that may have general interest are presented concerning a low micrometre size dust panicles pressure plasma ("lo-' Torr) that consists of three components: positively charged ions, negatively charged ions and electrons ('negative ion plasmas'). These ObSeNatiOnS include Langmuir probe characteristics and sheaths that are germane to such a plasma. Properties of plasma waves in a negative ion plasma such as phase velocity, dispersion and soliton propagation are described.

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