Four-body modified Coulomb-Born calculation for 2 MeV/amu C ⁶⁺ + He fully differential single ionization cross-section

Abstract

The four-body modified Coulomb-Born approximation including the internuclear interaction (MCB-NN) with a full quantum-mechanical method, is applied to investigate single ionization of helium by 2 MeV/amu C 6+ impact. The fully differential cross-sections (FDCS) are calculated for a variety of momentum transfers and ejected electron energies in the scattering plane. The obtained results are compared with the experimental data and the three-body distorted wave-eikonal initial state (3DW-EIS) results and we find that the magnitudes and the angular distribution of the FDCS is well reproduced by the MCB-NN theory for low ejected electron energy. Especially in the recoil region, the present MCB-NN results yield an excellent agreement with experiment.

Effective fully differential cross-section in single ionization of helium by fast ions

“…The FDCS for the single ionization of helium by 2 MeV u −1 C 6+ was measured for electrons ejected into the zx plane [10,12]. The experimental data were analyzed by various theoretical models [12,25,35,[56][57][58][59], where the conventional (unconvoluted) FDCSs were evaluated except in reference [35]. Figure 5 shows FDCSs for ε e =1, 4, and 10 eV and for q′=0.45, 0.65, 1.0, and 1.5.…”

Large discrepancies observed in theoretical studies of ion-impact ionization of the atomic targets at large momentum transfer

“…frame, and k e be the same for the ejected electron. In this frame, the corresponding FDCS is given by [17][18][19]…”