DOUBLE IONIZATION WITH POSITRONIUM FORMATION IN POSITRON - ATOM COLLISIONS

H. Bluhme, H. Knudsen#, J.P. Merrison and K. A. Nielsen

Institute of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark


In a recent series of measurements, we have shown that, surprisingly, for
positron impact on He and Ne the channel which leads to double ionization of
the target atom together with the formation of positronium is strongly
suppressed. In this poster, we compare these results with similar
experimental results obtained on Ar, Kr and Xe, as well as with the
analogue process of fragmentation of molecules accompanied by positronium
formation.