Effect of Charge Distribution in Out-of-Plane Structure for Excitation-Ionization Collisions

We present fully differential cross sections (FDCS) for electron-impact excitation-ionization of helium when the ionized electron is found outside of the scattering plane. Using our 4-Body Distorted Wave and First Born Approximation models, we show that the shape of the FDCS is largely due to the charge distribution of the He$+$ ion in the final state. We also examine the effects of electron correlation in the target helium atom, and the effects of the projectile interactions with the target.