Abstract
The inelastic collisions of positrons with calcium and strontium positive ions are treated for the first time as a three-channel problem within the framework of the improved coupled-static and frozen-core approximations with the assumption that the elastic, ground positronium and excited-positronium formation channels are open. The calculations of the partial and total cross sections are carried out for eight values of the total angular momentum ℓ (0 ≤ ℓ ≤7), at 20 values of the incident energy lying above the excited positronium formation threshold and extending to a wide region above the ionization threshold of the target ion. The total collisional positronium formation cross sections of e+– Sr+scattering show a peak around the ionization threshold of Sr+but display a peak at 30 eV for e+– Ca+scattering. In both scattering problems the total excited Ps formation cross sections have considerable values in the energy range [Formula: see text].
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