Naja, AStaicu-Casagrande, E.M.Lahmam-Bennani, AStevenson, MLohmann, BirgitDal Cappello, CBartschat, Klaus RKheifets, AnatoliBray, IgorFursa, Dmitry V.2015-12-100953-4075http://hdl.handle.net/1885/39489We report new coplanar (e, 2e) results for ionization of the He 1s and Ne 2p and 2s subshells under kinematics which have remained rather unexplored to date and characterized by large energy transfer and close to minimum momentum transfer from the projectile to the target. The experimental results obtained in two laboratories are used as a sensitive test of a number of state-of-the-art available theoretical models for multi-electron atoms. The He results are in excellent agreement with convergent close-coupling predictions as well as with distorted-wave + Gamow and hybrid distorted-wave + R-matrix models. In the Ne case, an overall satisfactory agreement with experiments is obtained for all considered models. The importance of post-collisional interaction effects is demonstrated whereas second-order effects in the projectile-target interaction at small distances are shown to be negligibly small. Remaining discrepancies between theories and experiments are discussed.Keywords: Energy transfer; Ionization of gases; Molecular interactions; Molecular modeling; Momentum transfer; Close-coupling predictions; Post-collisional interactions; Projectile-target interactions; Helium200810.1088/0953-4075/41/8/0852052015-12-09