Influence of electron correlations on double-capture process in proton–helium collisions
Ghavaminia Hoda, Ghanbari-Adivi Ebrahim†
       
Angular distributions of the double-electron capture differential cross sections for the collision of fast protons with helium atoms in their ground states. Both cross sections and scattering angles are given in the laboratory frame. The initial bound-state wave function for the helium atoms is the one-parameter Hylleraas wave function, while the final state wave function for the produced negative ion is described by the Shingal et al. [ 34 ] (solid lines), the Löwdin[ 35 ] (dashed lines), and the Hylleraas[ 32 ] (dash-dotted lines) wave functions. Closed circles are results from experiments.[ 17 ] The incident projectile energies are (a) 15 keV, (b) 25 keV, (c) 40 keV, (d) 50 keV, (e) 75 keV, (f) 100 keV, (g) 125 keV, and (h) 150 keV.