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Do positrons measure atomic and molecular diameters?

  • Jan Franz
  • Kamil FedusEmail author
  • Grzegorz P. Karwasz
Open Access
Regular Article
Part of the following topical collections:
  1. Topical Issue: Advances in Positron and Electron Scattering

Abstract

We report on density functional calculations (DFT) of elastic integral scattering cross-sections for positron collisions with argon, krypton, nitrogen and methane. The long-range asymptotic polarization potential is described using higher-order terms going much beyond an induced dipole potential (−α / r 4) while the short-range interaction is modeled by two different forms of electron – positron correlation potential (Boroński-Nieminen and Quantum Monte Carlo potentials). The results of both approaches agree quite well with the recent theoretical and measured values. Based on the present and previous theoretical and experimental data we discuss some systematics observed in integral scattering cross-sections below the positronium formation threshold. In particular we point out on the correlation between the values of scattering cross-sections and atomic dimensions.

Graphical abstract

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Authors and Affiliations

  1. 1.Department of Theoretical Physics and Quantum InformaticsFaculty of Applied Physics and Mathematics, Gdansk University of TechnologyGdańskPoland
  2. 2.Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus UniversityToruńPoland

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