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Positron Scattering from Atoms and Molecules

by Sultana N. Nahar 1,*,† and Bobby Antony 2,†
1
Department of Astronomy, The Ohio State University, Columbus, OH 43210, USA
2
Department of Physics, Indian Institute of Technology (Indian School of Mines) Dhanbad, Jharkhand 826 004, India
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Atoms 2020, 8(2), 29; https://doi.org/10.3390/atoms8020029
Received: 21 March 2020 / Revised: 21 May 2020 / Accepted: 4 June 2020 / Published: 15 June 2020
(This article belongs to the Special Issue Interactions of Positrons with Matter and Radiation)
A review on the positron scattering from atoms and molecules is presented in this article. The focus on positron scattering studies is on the rise due to their presence in various fields and application of cross section data in such environments. Positron scattering is usually investigated using theoretical approaches that are similar to those for electron scattering, being its anti-particle. However, most experimental or theoretical studies are limited to the investigation of electron and positron scattering from inert gases, single electron systems and simple or symmetric molecules. Optical potential and polarized orbital approaches are the widely used methods for investigating positron scattering from atoms. Close coupling approach has also been used for scattering from atoms, but for lighter targets with low energy projectiles. The theoretical approaches have been quite successful in predicting cross sections and agree reasonably well with experimental measurements. The comparison is generally good for electrons for both elastic and inelastic scatterings cross sections, while spin polarization has been critical due to its sensitive perturbing interaction. Positron scattering cross sections show relatively less features than that of electron scattering. The features of positron impact elastic scattering have been consistent with experiment, while total cross section requires significant improvement. For scattering from molecules, utilization of both spherical complex optical potential and R-matrix methods have proved to be efficient in predicting cross sections in their respective energy ranges. The results obtained shows reasonable comparison with most of the existing data, wherever available. In the present article we illustrate these findings with a list of comprehensive references to data sources, albeit not exhaustive. View Full-Text
Keywords: Electron-Positron Scatterings; atoms and molecules; cross sections and spin polarization; theoretical approaches Electron-Positron Scatterings; atoms and molecules; cross sections and spin polarization; theoretical approaches
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Nahar, S.N.; Antony, B. Positron Scattering from Atoms and Molecules. Atoms 2020, 8, 29.

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