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H (n=2 and 3) density matrices produced in proton-helium collisions at intermediate energies

Density matrices for the excited H (n=2 and 3) atoms produced in the electron transfer collisions between protons and helium atoms have been calculated for impact energies between 15 and 100 keV. The multichannel semiclassical impact parameter model with straight-line trajectories and an expansion in travelling atomic orbitals was used. The helium atom was approximated by a single electron moving in an effective potential. The calculated density matrices, the electric dipole moment and the first moment of the electron current density distribution are compared with experimental data of Ashburn et al. (1990).