Two-centre effects in electron emission from the impact of fast multiply charged projectiles on helium

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Abstract
The double differential cross sections (DDCS) for ejection of electrons from helium by p+, He2+, C6+ and O8+ of 1 MeV amu-1 energy have been measured as a function of electron energy and emission angle. The DDCS show deviations from the square of the projectile-charge dependence predicted by the first Born approximation, and the deviations are seen to increase with projectile charge. The data are in agreement with calculations using a continuum-distorted-wave eikonal-initial-state model, describing the simultaneous effect of the projectile and residual target fields. This indicates that two-centre effects are important in the electron emission.