Modeling of thermalization of fast electrons in nitrogen at low pressures

Petrović, Zoran Lj.; Stojanović, Vladimir; Nikitovic, Zeljka

doi:10.1088/0963-0252/18/3/034017

Cited by 3 publications

(5 citation statements)

References 49 publications

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“…Finally, for sprites and other non-equilibrium phenomena such as the entry of high-energy cosmic rays into the atmosphere and lightning discharges, Monte Carlo simulations have been applied. Experiments at high electric field to gas number density ratios in low-pressure discharges would be equivalents of such natural discharges [79].…”

Section: Laboratory Plasma Studiesmentioning

confidence: 99%

Modelling of plasma processes in cometary and planetary atmospheres

Campbell¹,

Brunger²

2012

Plasma Sources Sci. Technol.

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Electrons from the Sun, often accelerated by magnetospheric processes, produce low-density plasmas in the upper atmospheres of planets and their satellites. The secondary electrons can produce further ionization, dissociation and excitation, leading to enhancement of chemical reactions and light emission. Similar processes are driven by photoelectrons produced by sunlight in upper atmospheres during daytime. Sunlight and solar electrons drive the same processes in the atmospheres of comets. Thus for both understanding of planetary atmospheres and in predicting emissions for comparison with remote observations it is necessary to simulate the processes that produce upper atmosphere plasmas. In this review, we describe relevant models and their applications and address the importance of electron-impact excitation cross sections, towards gaining a quantitative understanding of the phenomena in question.

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Section: Laboratory Plasma Studiesmentioning

confidence: 99%

Modelling of plasma processes in cometary and planetary atmospheres

Campbell¹,

Brunger²

2012

Plasma Sources Sci. Technol.

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“…We have extended the calculations [31] to produce results for spatial profiles of emission that may easily be measured in practice and applied top analyze the effect of cosmic rays in the upper atmosphere.…”

Section: Thermalization Of High Energy Electrons In Nitrogenmentioning

confidence: 99%

“…In our study [31] we sample directly the emission coefficient and therefore we can also sample the effective cross section. In figure 4 we show results for the second positive state of nitrogen (337 nm emission).…”

Section: Thermalization Of High Energy Electrons At Low Pressures Of mentioning

confidence: 99%

“…It is hard to separate which effect is due to different assumptions and which due to different cross sections so we have performed a calculation with the assumption of only one generation of secondaries [31].…”

Section: Thermalization Of High Energy Electrons At Low Pressures Of mentioning

confidence: 99%

“…The effects for the first negative band and the ionization are smaller but it is still significant to use multiple generations of secondary electrons [31].…”

Section: Thermalization Of High Energy Electrons At Low Pressures Of mentioning

confidence: 99%

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Modelling of anomalous Doppler broadened lines, thermalization of electrons and the role of radicals in discharges at high E/N

Petrović

Nikitovic

Stojanović

2008

J. Phys.: Conf. Ser.

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Abstract. In this paper we show how Monte Carlo technique developed for swarm studies may be applied to model some real discharges or to provide data for realistic plasma models. In all cases discussed here the Monte Carlo technique without self consistent field is driven to a much greater level of complexity than usually found in swarm studies. We discuss three conceptually quite different situations that require exact modelling by Monte Carlo Simulations (MCS). The first is the case of transport in gases where degree of dissociation is large and thereby radicals formed by the discharge may affect the transport coefficients. Based on recent calculations for electron CF x radical cross sections we calculated how transport coefficients would be affected by the presence of radicals in pure CF 4 and CF 4 /Ar mixtures covering range of abundances often found in plasma etching devices. The second case studied here is modelling of thermalization of high energy electrons in the atmospheric gases as an attempt to provide the basis for detection of very high energy cosmic particles. In that case pressure dependent emission efficiency is studied as a function of electron energy and the system is developed to an arbitrary degree of secondary electron production. Finally we give some recent advances and current status of modelling of high E/N discharges operating in Townsend's regime in hydrogen where anomalous broadening was observed and explained by fast neutral excitation in both directions along and against the acceleration due to electric field.

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Microwave absorption and optical emission spectrometry analyses of ambient air plasmas induced by pulsed electron beams

Ribière

Eichwald

Yousfi

2020

Journal of Applied Physics

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This work is devoted to the characterization of plasmas produced by an intense pulsed relativistic electron beam propagating in air at atmospheric pressure. A large range of a time integrated dose is investigated [0.75 to 7.4] kGy(air) inducing electron densities from 2 × 1012 up to 1.6 × 1014 cm−3. The air plasmas are analyzed by two complementary diagnostics: microwave absorption and optical emission spectroscopy, to deduce plasma parameters during the creation and relaxation phases, respectively. A reduced air kinetics model is used to calculate transmission measurements during the electron beam pulse and to infer electric conductivities, which are compared to the results of three-dimensional Maxwell calculations. Optical emission spectra are measured and compared to calculated ones, giving rotational and vibrational temperatures during the relaxation phase of the plasma. These plasma characterizations may be used to model non-equilibrium atmospheric air plasma chemistry in the framework of, for instance, streamer dynamics as well as corona or dielectric barrier discharges.

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Modeling of thermalization of fast electrons in nitrogen at low pressures

Cited by 3 publications

References 49 publications

Modelling of plasma processes in cometary and planetary atmospheres

Modelling of plasma processes in cometary and planetary atmospheres

Modelling of anomalous Doppler broadened lines, thermalization of electrons and the role of radicals in discharges at high E/N

Microwave absorption and optical emission spectrometry analyses of ambient air plasmas induced by pulsed electron beams

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