Year: 2021
Type: article
Abstract: We theoretically study the positron elastic scattering by an atom with a multielectron semifilled subshell in its structure. We focus on gaining the initial insight into the specifics of such a process. The positron scattering by the Mn(…3d 5 4s 2 , 6 S) atom with a 3d 5 semifilled subshell (e + + Mn scattering) is chosen as a case study. We account for both the electron correlation and the formation of a e + + e − virtual positronium (Ps) in the intermediate states of the e + + Mn system. Electron correlation is taken into account in the framework of the self-energy part of the scattering positron Green function generalized for the application to semifilled-shell atoms. The influence of the virtual Ps formation on the positron scattering is taken into account by the reduction of the energy of the virtual positron plus atomic-excited-configuration states by the Ps-binding energy, to a reasonable approximation. We unravel the importance and specificity of the influence of both the virtual Ps and electron correlation on e + + Mn elastic scattering. We demonstrate spectacular differences between the electron and positron scattering processes.
Authors: M Ya Amusia, V K Dolmatov, L V Chernysheva
Language: English
Topic: Atomic and Molecular Physics
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W3166979497