Fully-stripped-beryllium-ion collisions with 2lm states of atomic hydrogen: Total and state-selective electron-capture cross sections

Integrated total and state-selective electron-capture cross sections are calculated for bare beryllium ion scattering on atomic hydrogen initially configured in the 2lm states (where n = 2, l, and m are the principal, angular momentum, and magnetic quantum numbers, respectively). This is done using the wave-packet convergent close-coupling approach which solves the three-body Schrodinger equation by employing a two-center expansion for the total scattering wave function. These calculations are performed within a projectile-energy range of 1 to 500 keV/u. The results suggest that at low energies, collisions with hydrogen in each of the 2lm states produce a total electron-capture cross section approximately an order of magnitude larger than for scattering on the ground state. However, as projectile energy increases, the cross section for capture from the excited states falls well below the H(1s) electron capture cross section. A possible reason for this observation could be related with the way the target electron radial densities are distributed in different initial states. The results obtained in this work are compared to previous calculations where available. In terms of the n-resolved charge-exchange cross sections, significant disagreement is found between our results and some preceding calculations available in the literature to warrant further investigations.