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Electronic, Photonic and Ionic Interactions with Atoms and Molecules

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Dear Colleagues,

The special issue on inelastic collisions between photons, electrons, and ions with atoms and molecules explores fundamental interactions in atomic, molecular, and plasma physics. Inelastic collisions, where energy is transferred between colliding particles and atoms or molecules, play a crucial role in various physical processes, from astrophysical phenomena to fusion energy research.

This topic covers the study of photon-atom interactions (such as photoionization and photon-induced dissociation), electron-atom and ion-atom collisions (including ionization, excitation, and charge exchange processes). These interactions are critical for understanding the fundamental behavior of matter under different energetic conditions.

This special issue collects cutting-edge studies aimed at enhancing our understanding of inelastic collision dynamics, which has implications for fields like space science, radiation physics, and industrial applications like material processing and radiation therapy.

Prof. Dr. Antonio Carlos Fontes dos Santos
Prof. Dr. Karoly Tokesi
Guest Editors

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Research

18 pages, 2145 KiB

Open AccessArticle

Modified Ji-Huan He’s Frequency Formulation for Large-Amplitude Electron Plasma Oscillations

by Stylianos Vasileios Kontomaris, Anna Malamou, Ioannis Psychogios and Gamal M. Ismail

Atoms 2024, 12(12), 68; https://doi.org/10.3390/atoms12120068 - 12 Dec 2024

Viewed by 283

Abstract

This paper examines oscillations governed by the generic nonlinear differential equation

{u^{″} = ω}_{p 0}^{2} (1 - u \mp \frac{2 β^{2}}{u^{γ}}),

where

ω_{p 0}, β

and

γ

are positive constants. The aforementioned differential [...] Read more.

This paper examines oscillations governed by the generic nonlinear differential equation

{u^{″} = ω}_{p 0}^{2} (1 - u \mp \frac{2 β^{2}}{u^{γ}}),

where

ω_{p 0}, β

and

γ

are positive constants. The aforementioned differential equation is of particular importance, as it describes electron plasma oscillations influenced by temperature effects and large oscillation amplitudes. Since no analytical solution exists for the oscillation period in terms of

ω_{p 0}, β, γ

and the oscillation amplitude, accurate approximations are derived. A modified He’s approach is used to account for the non-symmetrical oscillation around the equilibrium position. The motion is divided into two parts:

u_{m i n} \leq u < u_{e q}

and

u_{e q} < u \leq u_{m a x}

, where

u_{m i n}

and

u_{m a x}

are the minimum and maximum values of

u

, and

u_{e q}

is its equilibrium value. The time intervals for each part are calculated and summed to find the oscillation period. The proposed method shows remarkable accuracy compared to numerical results. The most significant result of this paper is that He’s approach can be readily extended to strongly non-symmetrical nonlinear oscillations. It is also demonstrated that the same approach can be extended to any case where each segment of the function

f (u)

in the differential equation

u^{″} + f (u) = 0

(for

u_{m i n} \leq u < u_{e q}

and for

u_{e q} < u \leq u_{m a x}

) can be approximated by a fifth-degree polynomial containing only odd powers. Full article

(This article belongs to the Special Issue Electronic, Photonic and Ionic Interactions with Atoms and Molecules)

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17 pages, 1138 KiB

Open AccessArticle

Charge Transfer Excitation of NeAr⁺ Ions in Collisions with Electrons

by Alexander Narits, Konstantin Kislov and Vladimir Lebedev

Atoms 2024, 12(12), 67; https://doi.org/10.3390/atoms12120067 - 12 Dec 2024

Viewed by 194

Abstract

We study the resonant processes of the excitation of weakly bound

{NeAr}^{+}

We study the resonant processes of the excitation of weakly bound

{NeAr}^{+}

ions in collisions with the free electrons of Ne/Ar mixture plasma under conditions typical of the active media of gas lasers and plasma-based UV radiation sources. The transitions leading to the population of charge transfer electronic terms are considered. Using an original theoretical approach developed recently, we study the dependences of the cross-sections of several competing resonant processes on the incident electron energy and the gas temperature of the plasma. The role of the continuous states of internuclear motion is discussed. We highlight the specific features of the processes considered that stem from the low binding energy of

{NeAr}^{+}

ions and demonstrate that, in the weakly bound systems, the efficiencies of different charge transfer excitation channels differ greatly from those obtained for ions with moderate dissociation energies. Full article

(This article belongs to the Special Issue Electronic, Photonic and Ionic Interactions with Atoms and Molecules)

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