Highly Charged Effect For Fully Differential Cross Sections For Single Ionization Of Helium By Ions

We present fully differential cross sections（FDCS） within four-body coulomb wave（4CW） for the single ionization of helium by highly charged ions. Comparisons are made among 4CW and the experimental data and such other predictions as three-distorted-wave-eikonal-initial state approach（3DW-EIS） and the first-Born-approximation-Hartree-Fock（FBA-HF） calculations. The angular distribution and relative heights of the present FDCS is found to qualitatively reproduce the reported experimental data for Au²⁴⁺and U⁹²⁺.The experiment displays unique forward peak structures in the FDCS that was not seen for Au⁵³⁺.It is shown that for highly charged effect of large perturbations are significant, but small perturbations are opposite. Furthermore, differently weighting of various scattering amplitudes to the FDCS are examined. It is found that the structure of the FDCS is determined by the interference pattern of these amplitudes. We also have studied the influence of the interactions between different particles.