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Atoms
Volume 13
Issue 5
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Atoms, Volume 13, Issue 5 (May 2025) – 3 articles

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20 pages, 1096 KiB  
Article
Elastic e-Atom Scattering Using Multi-Configuration Dirac–Fock Partial Wave Analysis
by R. Aiswarya and Jobin Jose
Atoms 2025, 13(5), 39; https://doi.org/10.3390/atoms13050039 - 30 Apr 2025
Abstract
A novel scattering formalism, the multi-configuration Dirac–Fock partial wave analysis (MCDF-PWA), is presented in this study. This approach extends the conventional Dirac partial wave analysis by incorporating multiple atomic configurations of the target scatterer. The newly formulated methodology is employed to compute the [...] Read more.
A novel scattering formalism, the multi-configuration Dirac–Fock partial wave analysis (MCDF-PWA), is presented in this study. This approach extends the conventional Dirac partial wave analysis by incorporating multiple atomic configurations of the target scatterer. The newly formulated methodology is employed to compute the cross-sections in elastic e-atom scattering. The analysis is performed for a few atomic targets like Mg, Ca, and Ba. Full article
(This article belongs to the Special Issue Many-Particle Dynamics in Collisions of Electrons, Positrons and Photons, 2nd Edition)
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13 pages, 1058 KiB  
Article
A Novel Approach to Calculate the Range of High-Energy Charged Particles Within a Medium
by Ioannis Psychogios, Stylianos Vasileios Kontomaris, Anna Malamou and Andreas Stylianou
Atoms 2025, 13(5), 38; https://doi.org/10.3390/atoms13050038 - 27 Apr 2025
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Abstract
The determination of energy loss of charged particles as they pass through a medium and consequently the calculation of their range within the medium are of tremendous importance in various areas of physics from both theoretical and practical perspectives. Previous works have derived [...] Read more.
The determination of energy loss of charged particles as they pass through a medium and consequently the calculation of their range within the medium are of tremendous importance in various areas of physics from both theoretical and practical perspectives. Previous works have derived approximate equations regarding the range of ions within a medium, focusing on providing simple solutions for practitioners in the radiotherapy field that do not require significant computational cost, unlike traditional Monte Carlo methods. These solutions focus on radiotherapy and are limited to specific ions’ initial speeds, which should be up to 0.65c (where c is the speed of light in vacuum). In this paper, solutions for significantly larger initial velocities are explored. A new analytical equation for determining the range of charged particles within a medium for initial velocities between 0.6c and 0.9c is presented. This equation provides excellent results when compared to the accurate numerical solution. Beyond its theoretical and mathematical interest, this solution is also reliable for radiotherapy applications. It provides excellent results for protons with initial energies between 200 MeV and 350 MeV and has the major advantage of being expressed in terms of elementary functions, making its use more straightforward compared to other approaches. Full article
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15 pages, 570 KiB  
Article
Electron and Positron Collision with Plasma Wall Coating Elements
by Balajee R, Yurekha S.P., Snigdha Sharma and Dhanoj Gupta
Atoms 2025, 13(5), 37; https://doi.org/10.3390/atoms13050037 - 26 Apr 2025
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Abstract
The investigation of integral elastic cross-section (ICS), momentum transfer cross-section (MTCS), viscosity cross-section (VCS), absorption cross-section (ABSCS), and total cross-section (TCS) of atoms by electron (e−) and positron (e+) impact is very crucial and essential for understanding [...] Read more.
The investigation of integral elastic cross-section (ICS), momentum transfer cross-section (MTCS), viscosity cross-section (VCS), absorption cross-section (ABSCS), and total cross-section (TCS) of atoms by electron (e−) and positron (e+) impact is very crucial and essential for understanding fundamental atomic processes and their applications in various fields such as plasma physics, molecular physics, and astrophysics. This study investigates and analyses the ICS, MTCS, VCS, ABSCS, and TCS of the atoms, Li, Be, B, Ti, and W, over a wide energy range. By employing the computational Optical Potential Method (OPM) and quantum scattering integrated in a computational package, ELSEPA (Elastic scattering of electrons and positrons by atoms, positive ions and molecules), the cross-sections of atoms by electron and positron impact are calculated. The present results shows good agreement with all the experimental and theoretical data available in the literature. The obtained cross-sections may facilitate the development of accurate models for plasma simulations and fusion research. Full article
(This article belongs to the Special Issue Many-Particle Dynamics in Collisions of Electrons, Positrons and Photons, 2nd Edition)
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