High-energy two-electron transfer in ion-atom collisions

Abstract Two-electron transfer by fast heavy nuclei from heliumlike targets is studied. A detailed sequence of comprehensive computations carried out in a large keV–MeV range the projectile energies. This set illustrated with total cross sections for double capture alpha particles helium atoms using several frequently applied four-body quantum-mechanical distorted wave models correct boundary conditions. The sensitivity obtained examined different choices bound and continuum states. Especially at high energies, influence compactness states investigated reference to mechanism velocity matching kinematic electron capture. Also considered dependence these on electronic screening target nuclear charges impact this shielding assessed corresponding bare Relative all available experimental data (100–6000 keV), found striking model-dependence implies that two-electron sharply associated one-electron involving same colliding particles.