TRANSPORT PHENOMENA IN POINT-PLANE GEOMETRY IN DENSE ARGON

We report hereafter some results on experiments on mobility of charge carriers in a point-plane electrode geometry in a wide density range f or Argon gas to liquid. For point anode mobilities of positive ions ar e recovered and agree with the values found in planar geometry. For po int cathode, due to the phenomenon of electron attachment two populati ons of charge carriers (electrons and ions) are coexistent and we stre ssed out a large impurity dependence of mobility. Finally we discuss a bout some optical observations for gas in negative polarity.