Do positrons measure atomic and molecular diameters?

Jan Franz; Kamil Fedus; Grzegorz P. Karwasz

doi:10.1140/epjd/e2016-70100-3

Do positrons measure atomic and molecular diameters?

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.

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Authors (3)

Jan Franz dr hab.
Kamil Fedus Dr.
- Nicolaus Copernicus University, Toruń Institute of Physics, Faculty of Physics, Astronomy and Informatics
Grzegorz P. Karwasz
- Nicolaus Copernicus University, Toruń Institute of Physics, Faculty of Physics, Astronomy and Informatics

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DOI:: Digital Object Identifier (open in new tab) 10.1140/epjd/e2016-70100-3
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Category:: Articles
Type:: artykuł w czasopiśmie wyróżnionym w JCR
Published in:: EUROPEAN PHYSICAL JOURNAL D no. 70, pages 1 - 7,
ISSN: 1434-6060
Language:: English
Publication year:: 2016
Bibliographic description:: Franz J., Fedus K., Karwasz G.: Do positrons measure atomic and molecular diameters?// EUROPEAN PHYSICAL JOURNAL D. -Vol. 70, nr. 245 (2016), s.1-7
DOI:: Digital Object Identifier (open in new tab) 10.1140/epjd/e2016-70100-3
Verified by:: Gdańsk University of Technology