Measurement of free-free emission from low-energy-electron collisions with Ar

Yamabe, Chobei; Buckman, Stephen; Phelps, A. V.

doi:10.1103/physreva.27.1345

Cited by 134 publications

(73 citation statements)

References 21 publications

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“…Gas phase electron coefficients were calculated in the following way: argon ionizization, excitation, and elastic collision cross sections were taken from the Phelps database [29] at [30]. Then using the open source Boltzmann solver Bolos [31] based on the work of Hagelaar [32] electron energy distribution functions were calculated for 200 electric field points between 10 3 and 10 7 V m −1 .…”

Section: Model Descriptionmentioning

confidence: 99%

Fully coupled simulation of the plasma liquid interface and interfacial coefficient effects

Lindsay¹,

Graves²,

Shannon³

2016

J. Phys. D: Appl. Phys.

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There is a growing interest in the study of coupled plasma-liquid systems because of their applications to biomedicine, biological and chemical disinfection, agriculture, and other areas. Optimizing these applications requires a fundamental understanding of the coupling between phases. Though much progress has been made in this regard, there is still more to be done. One area that requires more research is the transport of electrons across the plasma-liquid interface. Some pioneering works (Rumbach et al 2015 Nat. Commun. 6, Rumbach et al 2015 J. Phys. D: Appl. Phys. 48 424001) have begun revealing the near-surface liquid characteristics of electrons. However, there has been little work to determine the near-surface gas phase electron characteristics. Without an understanding of the near-surface gas dynamics, modellers are left to make assumptions about the interfacial conditions. For instance it is commonly assumed that the surface loss or sticking coefficient of gas-phase electrons at the interface is equal to 1. In this work we explore the consequences of this assumption and introduce a couple of ways to think about the electron interfacial condition. In one set of simulations we impose a kinetic condition with varying surface loss coefficient on the gas phase interfacial electrons. In a second set of simulations we introduce a Henry's law like condition at the interface in which the gas-phase electron concentration is assumed to be in thermodynamic equilibrium with the liquid-phase electron concentration. It is shown that for a range of electron Henry coefficients spanning a range of known hydrophilic specie Henry coefficients, the gas phase electron density in the anode can vary by orders of magnitude. Varying reflection of electrons by the interface also has consequences for the electron energy profile; increasing reflection may lead to increasing thermalization of electrons depending on choices about the electron energy boundary condition. This variation in anode electron density and energy as a function of the interface characteristics could also lead to significant variation in near-surface gas chemistries when such reactions are included in the model; this could very well in turn affect the reactive species impinging on the liquid surface. We draw the conclusion that in order to make more confident model predictions about plasma-liquid systems, finer scale simulations and/or new experimental techniques must be used to elucidate the near-surface gas phase electron dynamics.

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Section: Model Descriptionmentioning

confidence: 99%

Fully coupled simulation of the plasma liquid interface and interfacial coefficient effects

Lindsay¹,

Graves²,

Shannon³

2016

J. Phys. D: Appl. Phys.

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“…denotes the reaction energy in the corresponding chemical reactions, and the electron-impact rate coefficients of the first five reactions in Table I are calculated using the electron cross sections data imported from Ref. 18 and the following equation (3):…”

Section: For Ionsmentioning

confidence: 99%

Simulation of a large size inductively coupled plasma generator and comparison with experimental data

Lei,

Li,

Liu

et al. 2018

AIP Advances

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A two-dimensional axisymmetric inductively coupled plasma (ICP) model with its implementation in the COMSOL (Multi-physics simulation software) platform is described. Specifically, a large size ICP generator filled with argon is simulated in this study. Distributions of the number density and temperature of electrons are obtained for various input power and pressure settings and compared. In addition, the electron trajectory distribution is obtained in simulation. Finally, using experimental data, the results from simulations are compared to assess the veracity of the two-dimensional fluid model. The purpose of this comparison is to validate the veracity of the simulation model. An approximate agreement was found (variation tendency is the same). The main reasons for the numerical magnitude discrepancies are the assumption of a Maxwellian distribution and a Druyvesteyn distribution for the electron energy and the lack of cross sections of collision frequencies and reaction rates for argon plasma.

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“…σ j is the total excitation section including vibrational and electronic excitation. The cross-sections are obtained from the previously published literature (Crompton et al 1967;Date et al 1989;Meunier et al 1995;Phelps and Pitchford 1985;Yamabe et al 1983). In order to solve Equations [5] and [6] for f 0 and f 1 , a initial effective ionization coefficient value (α − η) 0 is employed, and then these two nonlinear equations are solved by using finite element method, simultaneously.…”

Section: By Substituting Equation [3] Into [2] and Multiplying By Thementioning

confidence: 99%

The Influence of Inert Gas Addition on Electric Breakdown Utilizing Dielectric Barrier Discharge in Ozone Generation in Air

Wei

Yuan

Zhang

et al. 2014

Ozone: Science & Engineering

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This article investigates the effect of inert gas additionHe, Ar, Kr, and Xe on gas breakdown voltage within a dielectric barrier discharge reactor with air feed gas. The density-normalized effective ionization coefficients α eff N are calculated for inert gas/air mixtures; the critical reduced field E/N cr is then obtained where the electron ionization exactly balances the attachment. Adding inert gases would lead to the decreasing critical reduced field strength E/N cr due to the enhancement of effective ionization coefficient. In addition, inert gas additions have shown to reduce the breakdown voltage. Moreover the calculated breakdown voltage values and the experimental data are plotted for the sake of comparison and results show that calculated results are in agreement with the experimental values. Parametric studies offer substantial insight in plasma physics, as well as in ozone generation applications.

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Measurement of free-free emission from low-energy-electron collisions with Ar

Cited by 134 publications

References 21 publications

Fully coupled simulation of the plasma liquid interface and interfacial coefficient effects

Fully coupled simulation of the plasma liquid interface and interfacial coefficient effects

Simulation of a large size inductively coupled plasma generator and comparison with experimental data

The Influence of Inert Gas Addition on Electric Breakdown Utilizing Dielectric Barrier Discharge in Ozone Generation in Air

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