Ab Initio Double-Differential Ionization Cross-Section Calculations in Antiproton–Helium Collisions

Barna, Imre Ferenc; Pocsai, Mihály András; Tőkési, K.

doi:10.3390/atoms11040074

Cited by 2 publications

(3 citation statements)

References 54 publications

(84 reference statements)

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“…Using the above equation, Equation (17), namely, u e (T e ) = 1.5 k B T e , can be rewritten in a briefer form as u e (T e )[eV] = 1.5 Ťe [eV]…”

Section: Methodsmentioning

confidence: 99%

“…The topic of the collision cross sections of electrons has received research attention in several studies over many years [7][8][9][10][11][12][13][14][15]. The collision cross section of an electron depends on the kinetic energy of the electron and thus depends on its speed [16,17]. However, such a detailed description can be too cumbersome and time-consuming for practically estimating the electric conductivity of plasma, where finding the electron-neutral collision cross sections is just one stage of several stages of computation needed to find a single electric conductivity value for a plasma gas mixture.…”

Section: Introduction 1backgroundmentioning

confidence: 99%

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Temperature-Dependent Functions of the Electron–Neutral Momentum Transfer Collision Cross Sections of Selected Combustion Plasma Species

Marzouk

2023

Applied Sciences

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The collision cross sections (CCS), momentum transfer cross sections (MTCS), or scattering cross sections (SCS) of an electron–neutral pair are important components for computing the electric conductivity of a plasma gas. Larger collision cross sections for electrons moving freely within neutral particles (molecules or atoms) cause more scattering of these electrons by the neutral particles, which leads to degraded electron mobility, and thus reduced electric conductivity of the plasma gas that consists of electrons, neutral particles, and ions. The present work aimed to identify the level of disagreement between four different methods for describing how electron–neutral collision cross sections vary when they are treated as a function of electron temperature alone. These four methods are based on data or models previously reported in the literature. The analysis covered six selected gaseous species that are relevant to combustion plasma, which are as follows: carbon monoxide (CO), carbon dioxide (CO2), molecular hydrogen (H2), water vapor (H2O), potassium vapor (K), and molecular oxygen (O2). The temperature dependence of the collision cross sections for these species was investigated in the range from 2000 K to 3000 K, which is suitable for both conventional air–fuel combustion and elevated-temperature oxygen–fuel (oxy-fuel) combustion. The findings of the present study suggest that linear functions are enough to describe the variations in the collision cross sections of the considered species in the temperature range of interest for combustion plasma. Also, the values of the coefficient of variation (defined as the sample standard deviation divided by the mean) in the collision cross sections using the four methods were approximately 27% for CO, 42% for CO2, 13% for H2, 39% for H2O, 44% for K, and 19% for O2. The information provided herein can assist in simulating magnetohydrodynamic (MHD) power generators using computational fluid dynamics (CFD) models for combustion plasma flows.

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“…Using the above equation, Equation (17), namely, u e (T e ) = 1.5 k B T e , can be rewritten in a briefer form as u e (T e )[eV] = 1.5 Ťe [eV]…”

Section: Methodsmentioning

confidence: 99%

Section: Introduction 1backgroundmentioning

confidence: 99%

Temperature-Dependent Functions of the Electron–Neutral Momentum Transfer Collision Cross Sections of Selected Combustion Plasma Species

Marzouk

2023

Applied Sciences

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“…For the case of antiproton impact, a comparison with previous calculations was made in [31]. More recent (non-DFT) state-of-the-art studies of antiproton-helium collisions have been presented in [32,49,50]. [36] with different final-state analyses): blue dotted lines, IEM for proton impact; red dashdotted lines, IEM for antiproton impact; blue dashed lines, WB for proton impact; red solid lines, WB for antiproton impact.…”

Section: Single-electron and Double-electron Processes In Collisions ...mentioning

confidence: 99%

Time-Dependent Density Functional Theory for Atomic Collisions: A Progress Report

Kirchner

2024

Atoms

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In this paper, the current status of time-dependent density functional theory (TDDFT)-based calculations for ion–atom collision problems is reviewed. Most if not all reported calculations rely on the semiclassical approximation of heavy particle collision physics and the time-dependent Kohn–Sham (TDKS) scheme for computing the electronic density of the system. According to the foundational Runge–Gross theorem, all information available about the electronic many-body system is encoded in the density; however, in practice it is often not known how to extract it without resorting to modelling and approximations. This is in addition to a necessarily approximate implementation of the TDKS scheme due to the lack of precise knowledge about the potential that drives the equations. Notwithstanding these limitations, an impressive body of work has been accumulated over the past few decades. A sample of the results obtained for various collision systems is discussed here, in addition to the formal underpinnings and theoretical and practical challenges of the application of TDDFT to atomic collision problems, which are expounded in mostly nontechnical terms. Open problems and potential future directions are outlined as well.

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Ab Initio Double-Differential Ionization Cross-Section Calculations in Antiproton–Helium Collisions

Cited by 2 publications

References 54 publications

Temperature-Dependent Functions of the Electron–Neutral Momentum Transfer Collision Cross Sections of Selected Combustion Plasma Species

Temperature-Dependent Functions of the Electron–Neutral Momentum Transfer Collision Cross Sections of Selected Combustion Plasma Species

Time-Dependent Density Functional Theory for Atomic Collisions: A Progress Report

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