Electron capture in pseudo-two-electron systems:Ar8++He

Molecular-structure calculations using the pseudopotential method have been performed on the (ArHe${)}^{8+}$ system. The cross section for single-electron capture in ${\mathrm{Ar}}^{8+}$+He collisions was calculated for energies from 20 eV to 10 keV/amu. The perturbed-stationary-state method [M. Kimura, H. Sato, and R. E. Olson, Phys. Rev. A 28, 2085 (1983)], modified to include electron translation factors appropriate to two-electron systems, was used. The total cross section is relatively energy independent with a value of approximately 2.5×${10}^{\mathrm{-}15}$ ${\mathrm{cm}}^2$. The n=4 level of ${\mathrm{Ar}}^{7+}$ is found to be preferentially populated, with the 4f level being dominant.