Electron-electron interaction in the electron loss of He+ on H2 and He

Abstract The simultaneous ionization of the projectile and the target is studied in He + +{H 2 ,He} collisions. The energy dependence of the cross section for this process is analyzed through experimental results obtained by coincidence measurements and theoretical calculations considering the antiscreening and two-center double-ionization mechanisms. The excellent agreement obtained between theory and experiment allows one to obtain a good understanding of the dynamics of this projectile loss mechanism.