Abstract
The dynamics of ns → n′s excitations of hydrogen by positron impact with exponential cosine-screened Coulomb potentials (ECSCPs) has been investigated using a distorted-wave theory in momentum space. Making use of a simple variationally determined wave function for the hydrogen atom, it has been possible to obtain the distorted-wave scattering amplitude in a closed analytical form. A detailed study has been made on differential and total cross sections in the energy range 20–250 eV. To the best of our knowledge, such a study on the differential and total cross sections for inelastic positron–hydrogen collisions with ECSCPs is the first reported in the literature.
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