Electron scattering cross sections for the modelling of oxygen-containing plasmas*

Alves, L. L.; Coche, Philippe; Ridenti, Marco Antonio; Guerra, Vasco

doi:10.1140/epjd/e2016-70102-1

Cited by 37 publications

(41 citation statements)

References 56 publications

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“…The calculated Townsend reduced, attachment coefficient, η/N (also known as attachment, reduced coefficient), for the pure oxygen molecule as a function of E/N is shown in figure (9). The present calculation i found tso be in a good agreement with theoretical results of (Jeon, 2003;Hien et al, 2012 andAlves et al, 2016) and experimental results of (Huxley et al, 1959). An electron avalanche can occur when the effective ionization-coefficient (α-η)/N >0.…”

Section: Resultssupporting

confidence: 88%

“…Otherwise the experimental values of (Jeon and Nakamura, 1998) and theoretical values of (Toui and Tuan, 2018) are lower than the present results at the range E/N≥ 1 Td, the variation of present results gives rise by large momentum transfer cross -section. Figure (6) is comparison between the present results for electron mobility with theoretical results of (Alves et al, 2016) at room ZANCO Journal of Pure and Applied Sciences 2020 temperature, the present results agree well with theoretical results. The transverse diffusion coefficient, DN for electrons in pure oxygen, as a function of E/N varying from 0.1 Td to 1000 Td is illustrated in figure (7), together with theoretical multi term solution results obtained from (Dujko, et al, 2011) for comparison.…”

Section: Resultssupporting

confidence: 85%

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Boltzmann equation studies on electron swarm parameters for oxygen plasma by using electron collision cross – sections

2020

ZJPAS

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The Boltzmann transport equation has been solved using a two-term approximation method in pure electronegative gas oxygen to evaluate the electron energy distribution function (EEDF) and electron transport parameters for a wide range of E/N varying from 0.1 to 1000 Td (1 Td=10-17 V.cm 2). These parameters, are "electron drift velocity, mean electron energy, characteristic energy, diffusion coefficients, electron mobility, attachment and ionization coefficients, effective ionization coefficient and critical reduced electric field strength (E/N) crt ".. The dependence of second kind collision (super-elastic collision) and electron energy distribution function on E/N are explained (where E is electric field and N is neutral number density). The present calculated results are in good agreements as compared, with the previous experimental and theoretical results. A group of electron/molecule collision (elastic and inelastic) cross-sections are collected for oxygen gas to evaluate transport parameters over the entire E/N range. In addition, the energy lost by different types of electron/molecule collision processes are computed as a function of E/N.

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Section: Resultssupporting

confidence: 88%

Section: Resultssupporting

confidence: 85%

Boltzmann equation studies on electron swarm parameters for oxygen plasma by using electron collision cross – sections

2020

ZJPAS

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“…The electron impact cross sections for O 2 and O were recently reviewed in [218,219]. Only a brief overview is given here and the reader should refer to these papers for further details.…”

Section: O 2 and Omentioning

confidence: 99%

Advances in non-equilibrium $$\hbox {CO}_2$$ plasma kinetics: a theoretical and experimental review

et al. 2021

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Numerous applications have required the study of CO2 plasmas since the 1960s, from CO2 lasers to spacecraft heat shields. However, in recent years, intense research activities on the subject have restarted because of environmental problems associated with CO2 emissions. The present review provides a synthesis of the current state of knowledge on the physical chemistry of cold CO2 plasmas. In particular, the different modeling approaches implemented to address specific aspects of CO2 plasmas are presented. Throughout the paper, the importance of conducting joint experimental, theoretical and modeling studies to elucidate the complex couplings at play in CO2 plasmas is emphasized. Therefore, the experimental data that are likely to bring relevant constraints to the different modeling approaches are first reviewed. Second, the calculation of some key elementary processes obtained with semi-empirical, classical and quantum methods is presented. In order to describe the electron kinetics, the latest coherent sets of cross section satisfying the constraints of "electron swarm" analyses are introduced, and the need for self-consistent calculations for determining accurate electron energy distribution function (EEDF) is evidenced. The main findings of the latest zero-dimensional (0D) global models about the complex chemistry of CO2 and its dissociation products in different plasma discharges are then given, and full state-to-state (STS) models of only the vibrational-dissociation kinetics developed for studies of spacecraft shields are described. Finally, two important points for all applications using CO2 containing plasma are discussed: the role of surfaces in contact with the plasma, and the need for 2D/3D models to capture the main features of complex reactor geometries including effects induced by fluid dynamics on the plasma properties. In addition to bringing together the latest advances in the description of CO2 non-equilibrium plasmas, the results presented here also highlight the fundamental data that are still missing and the possible routes that still need to be investigated.

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“…Reactions involving humidity were excluded from the reaction set as no humidity was introduced in the experiments. Where possible, the reaction rates of electron impact reactions were obtained from cross section data using the Boltzmann solver Bolsig+ [40] and cross-section data from LxCat [41], accounting for electron collisions with nitrogen molecules [42], oxygen molecules [43], nitrogen atoms [44], oxygen atoms [45,46], and nitric oxide [47]. The Boltzmann solver was used to pre-populate a look-up table with reaction rates for different effective electron temperatures, without constraining the electron energy distribution function (EEDF) to any particular distribution.…”

Section: Computational Modelmentioning

confidence: 99%

Influence of the On-time on the Ozone Production in Pulsed Dielectric Barrier Discharges

Montazersadgh

Wright

Ren

et al. 2019

Plasma

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Understanding the production mechanisms of ozone and other reactive species in atmospheric pressure dielectric barrier discharges (DBDs) has become increasingly important for the optimization and commercial success of these plasma devices in emerging applications, such as plasma medicine, plasma agriculture, and plasma catalysis. In many of these applications, input power modulation is exploited as a means to maintain a low gas temperature. Although the chemical pathways leading to ozone production/destruction and their strong temperature dependence are relatively well understood, the effect of the on-time duration on the performance of these modulated DBDs remains largely unexplored. In this study, we use electrical and optical diagnostics, as well as computational methods, to assess the performance of a modulated DBD device. The well-established Lissajous method for measuring the power delivered to the discharge is not suitable for modulated DBDs because the transients generated at the beginning of each pulse become increasingly important in short on-time modulated plasmas. It is shown that for the same input power and modulation duty-cycle, shorter on-time pulses result in significantly enhanced ozone production, despite their operation at slightly higher temperatures. The key underpinning mechanism that causes this counter-intuitive observation is the more efficient net generation rate of ozone during the plasma on-time due to the lower accumulation of NO2 in the discharge volume.

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Electron scattering cross sections for the modelling of oxygen-containing plasmas*

Cited by 37 publications

References 56 publications

Boltzmann equation studies on electron swarm parameters for oxygen plasma by using electron collision cross – sections

Boltzmann equation studies on electron swarm parameters for oxygen plasma by using electron collision cross – sections

Advances in non-equilibrium $$\hbox {CO}_2$$ plasma kinetics: a theoretical and experimental review

Influence of the On-time on the Ozone Production in Pulsed Dielectric Barrier Discharges

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