Recent progress in the study of positronpositron and positroniumpositronium induced
ionizationionization is reviewed within the context of the inert atoms. The focus is on
experimental techniques and results, which comprise both integral and differential cross-
sections. differential cross-sectionsintegrated cross-sections Measurements for positronium
formationpositronium formation and direct ionizationdirect ionization by positron impact,
accompanied by singly-or multiply-charged ions, are compared and discussed. First data …