Calculation of Electron‐Scattering Cross Sections Relevant for Hypersonic Plasma Modeling

Laricchiuta, Annarita; Celiberto, R.; Capitelli, M.; Colonna, G.

doi:10.1002/ppap.201600131

Cited by 4 publications

(3 citation statements)

References 43 publications

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“…This type of modelling requires a large set of scattering data for the elementary processes occurring under strong non-equilibrium conditions that are met in the atmospheric plasma close to the surface of the thermal shield. Vibrational exchanges of energy play an important role in re-entry problems, and collisional processes involving vibrationally excited molecules and stateto-state approaches (including complete databases of stateresolved cross-sections and rate coefficients) are therefore of particular importance [25,26].…”

Section: Introductionmentioning

confidence: 99%

Non-equilibrium kinetics of the ground and excited states in N₂–O₂under nanosecond discharge conditions: extended scheme and comparison with available experimental observations

Šimek¹,

Bonaventura²

2018

J. Phys. D: Appl. Phys.

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A numerical 0D kinetic model is developed here to simulate the detailed kinetics of the ground and excited electronic states of atmospheric gases occurring under streamer discharge conditions. The model is based on an extended kinetic scheme that involves state-to-state vibrational kinetics of the ground electronic states of N2, O2 and NO diatomics, including e–V, V–V and V–T energy transfers, and contains about 104 processes for more than 500 tracked state-specific states (including the higher excited and autoionising states of NI/OI atomic species), and also for state-non-specific species. This scheme takes into account the most important radiative processes occurring in N2 and N2–O2 mixtures that are of diagnostic interest, including the extreme ultraviolet and vacuum ultraviolet radiation produced by many excited and autoionising states of NI/OI. The dependence of the rates of electron-impact processes on the reduced electric field E/N is found by solving the Boltzmann equation for electrons in the two-term approximation using the Boltzmann equation solver Open Source library, BOLOS. We examine several test cases: pure nitrogen at 50 and 200 Torr and synthetic air at 10, 50 and 760 Torr, at a gas temperature of 300 K. The numerical results for pure nitrogen were compared with experimental results recently obtained by laser induced fluorescence for metastables. Good qualitative agreement was observed between numerical simulations and experiments at vibronic levels v = 2–5, giving important feedback on the appropriateness of the kinetic scheme. Numerical results were also used to find several general spectrometric signatures that might be helpful in the development of diagnostic procedures.

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Section: Introductionmentioning

confidence: 99%

Non-equilibrium kinetics of the ground and excited states in N₂–O₂under nanosecond discharge conditions: extended scheme and comparison with available experimental observations

Šimek¹,

Bonaventura²

2018

J. Phys. D: Appl. Phys.

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“…In this paper the electron-impact excitations to the A 1 Π state are considered in the framework of the similarity approach [21] for the derivation of vibrationally-specific dynamical data. This simplified approach has been proved to be characterized by a reasonable accuracy and has been reformulated to account for the effect of non-adiabatic vibronic coupling [22,23]. The state-to-state excitations to the A state are also derived in the framework of the BE-scaling method [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Electron-CO excitation and ionization cross sections for plasma modeling

Laricchiuta¹,

Pietanza²,

Capitelli³

et al. 2018

Plasma Phys. Control. Fusion

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The influence of the internal energy content, either vibrational or electronic, on the probability of CO elementary processes induced by electron-impact is investigated. In particular the vibronic excitations of the first singlet state of the CO spectrum, A 1 Π, are derived in the framework of the similarity approach, characterizing also the radiative properties to the ground electronic state. Moreover the ionization of the ground state to the first three states of the molecular ion are calculated with the binary-encounter-dipole model, investigating the branching ratio of the three channels and their vibrational dependence. Finally the total ionization of the CO metastable a 3 Π state is considered in the binary-encounter-Bethe approach.

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“…Finally, part II of the special issue also contains one paper related to elementary data, which are indispensable for accurate modelling as discussed also in the first double issue. More specifically, Laricchiuta and colleagues, from PLASMI Lab in Bari, present calculated electron‐scattering cross sections for optically allowed excitations to the B 2 Π and C 2 Π states in NO, of interest for hypersonic plasma modelling . A similarity approach is adopted, accounting for the nonadiabatic vibronic coupling perturbing the vibrational progression in the excited states, to generate both state‐to‐state and total cross sections that are compared with available experimental data.…”

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confidence: 99%

Special issue on numerical modelling of low‐temperature plasmas for various applications — part II: Research papers on numerical modelling for various plasma applications

Bogaerts

Alves

2017

Plasma Processes & Polymers

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We present here part II of the special issue on "Numerical Modelling of Low-temperature Plasmas for Various Applications", which was divided in two parts, with each part organized as a double issue. The first double issue contained review and tutorial papers on the various modelling approaches and closely related topics, like model verification and validation, plasma-surface interaction modelling and input data for modelling. [1] In the present double issue, we give illustrations of the different modelling approaches for various applications.Low-temperature plasmas are extensively used for microelectronic applications. The two main plasma sources used for this purpose are inductively coupled plasmas (ICP) and capacitively coupled plasmas (CCP). This special issue contains a number of papers describing these two different plasma sources. Wen and colleagues from Dalian University of Technology, University of California and University of Antwerp apply a global (i.e., volume-averaged) bulk plasma model, coupled bi-directionally with a Monte Carlo (MC)/ fluid sheath model for an ICP operating in Ar/O 2 gas mixtures. [2] The model calculates the ion energy and angular distribution functions bombarding the rf-biased electrode for different bias voltages, pressures and coil powers. Mouchtouris and Kokkoris (National Center for Scientific Research (NCSR) "Demokritos" in Attica) present a multi-scale model for a low pressure ICP in Ar, based on a reactor scale model for describing the plasma behaviour, a MC particle tracing model to calculate the ion energy and angular distributions, and a MC surface model to calculate the evolution of surface morphology during the etching of a polymeric substrate. [3] This model allows linking the operating parameters of the plasma reactor with the evolution of the surface roughness. Stratakos, Zeniou and Gogolides, also working at NCSR "Demokritos", perform a full-wave three-dimensional electromagnetic analysis in vacuum to calculate and compare the electric/magnetic field components of different helical and helicon antennas used to generate ICPs. [4] This is important to select the appropriate antenna type for a plasma source.Large scale CCPs, operating at high frequencies, are studied by Eremin, Brinkmann and Mussenbrock (Ruhr-University

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Calculation of Electron‐Scattering Cross Sections Relevant for Hypersonic Plasma Modeling

Cited by 4 publications

References 43 publications

Non-equilibrium kinetics of the ground and excited states in N₂–O₂under nanosecond discharge conditions: extended scheme and comparison with available experimental observations

Non-equilibrium kinetics of the ground and excited states in N₂–O₂under nanosecond discharge conditions: extended scheme and comparison with available experimental observations

Electron-CO excitation and ionization cross sections for plasma modeling

Special issue on numerical modelling of low‐temperature plasmas for various applications — part II: Research papers on numerical modelling for various plasma applications

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Calculation of Electron‐Scattering Cross Sections Relevant for Hypersonic Plasma Modeling

Cited by 4 publications

References 43 publications

Non-equilibrium kinetics of the ground and excited states in N2–O2under nanosecond discharge conditions: extended scheme and comparison with available experimental observations

Non-equilibrium kinetics of the ground and excited states in N2–O2under nanosecond discharge conditions: extended scheme and comparison with available experimental observations

Electron-CO excitation and ionization cross sections for plasma modeling

Special issue on numerical modelling of low‐temperature plasmas for various applications — part II: Research papers on numerical modelling for various plasma applications

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Non-equilibrium kinetics of the ground and excited states in N₂–O₂under nanosecond discharge conditions: extended scheme and comparison with available experimental observations

Non-equilibrium kinetics of the ground and excited states in N₂–O₂under nanosecond discharge conditions: extended scheme and comparison with available experimental observations