Fluid model of H‐form of the positive column in DC oxygen glow discharge

Laca, M.; Morávek, Matěj Jan; Schmiedt, L.; Hrachová, V.; Kaňka, A.

doi:10.1002/ctpp.201600063

Cited by 4 publications

(4 citation statements)

References 48 publications

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“…(b)The density of O − is higher than the electron density in the center of the discharge cell, while it is reversed in the cathode sheath region. It is consistent with the result in DC parallel plane discharge [55].…”

Section: The Validity Of the Modelsupporting

confidence: 93%

“…While the density of O − is lower than electron density in the cathode sheath region. The spatial distribution of O − is consistent with the result in DC parallel plane discharge[55]. With the increase of oxygen concentration, the maximum electron density decreases after the oxygen concentration is greater than 0.3%, as shown in figure 5(b).…”

supporting

confidence: 85%

“…(c) The O density is much higher than the charged particles density, which is similar to that in other kinds of discharge [55,56].…”

Section: The Validity Of the Modelsupporting

confidence: 65%

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The influence of oxygen concentration on the hollow cathode discharge in He/O₂ mixed gas

He¹,

Zhao²,

Ha³

et al. 2022

Phys. Scr.

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Hollow cathode discharge in He/O2 mixed gas is simulated using a two-dimensional fluid model for the first time. The model contains 15 particles and 66 reactions. The evolutions of discharge current, electric field, charged and reactive particles with different oxygen concentrations are obtained. The primary mechanisms of generation and loss for particles under different oxygen concentrations are discussed. The results show that the added O2 in helium has both positive and negative effects on the discharge. The discharge does not monotonically change with the increasing oxygen concentration. When the oxygen concentration is low, oxygen admixture could enhance the discharge, that is, the discharge current, radial electric field, electron density, O+ 2 density, O density, and the O(1D) density increase with the increase of oxygen concentration. When the oxygen concentration is high, it will weaken discharge, that is, the discharge current, radial electric field, electron density, O+ 2 density, O density, and the O(1D) density decrease with the increase of oxygen concentration. The main reactive particles in discharge are O and O(1D). These densities are much higher than the density of charged particles. The optimal oxygen concentration for O and O(1D) is 0.5% and 0.4%, and the corresponding maximum density is 4.34×1013 cm-3 and 1.50×1013 cm-3. The generation and loss rates for these particles at different oxygen concentrations are calculated, which contributes to the change in particle densities.

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Section: The Validity Of the Modelsupporting

confidence: 93%

supporting

confidence: 85%

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The influence of oxygen concentration on the hollow cathode discharge in He/O₂ mixed gas

He¹,

Zhao²,

Ha³

et al. 2022

Phys. Scr.

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“…Electron collision with molecular oxygen is significant in the physics and chemistry of the earth’s and planetary atmospheres. It plays an essential role in the chemistry of oxygen discharge, − the space vehicle earth (re-)entry problem, − as well as both astrophysics and laboratory oxygen plasma. − In the multiple processes in which an electron impacts the molecular oxygen target, electronic (de-)excitation is quite meaningful and promising. The excited states of molecular oxygen participate in many physical and chemical processes.…”

Section: Introductionmentioning

confidence: 99%

R-Matrix Calculation of Electron Collisions with Molecular Oxygen in Its Electronically Excited States

2022

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Low-energy electron collisions with the X3Σg– ground state and a1Δg and b1Σg+, the Herzberg states (c1Σu –, A′3Δu, and A3Σu+), and B3Σu – excited states of the O2 molecules are studied using the fixed-nucleus R-matrix method. Integral elastic scattering and electronic excitation cross sections from the X3Σg – ground state overall agree well with the available experimental and theoretical results. The electronic (de-)excitation cross sections for the electron impact with the Herzberg states and the B3Σu – state are reported. The value of elastic cross sections for the six excited states decreases with the increment of electron energy, except for the resonance peaks. As the case of excitation from the X3Σg – ground state, the O2 – 2Πu resonance makes a dominant contribution to the (de-)excitation cross sections from the a1Δg, b1Σg +, and the Herzberg states. The magnitude of the de-excitation cross sections at the location of the 2Πu resonance from the Herzberg states to the ground state is about 2 to 8 times those of the excitation cross sections for the corresponding excitation transitions. These results should be significant for models of oxygen plasma and the dynamics of the Herzberg states of molecular oxygen in the earth’s atmosphere.

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Theoretical simulation of hydrogen glow discharge in the positive column of plasma sources

2018

Mod. Phys. Lett. B

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Direct current (DC) glow discharge positive column has played an important role in the field of plasma material surface modification. In this kinetic study of hydrogen glow discharge in the positive column, it is found that electron energy distribution function (EEDF) obviously departs from Maxwell distribution. The EEDF tail moves to higher energy when the ratio between electric field E and density of neutral species N (E/N) increases and the tail moves toward higher energy if hydrogen atom proportion increases at the same E/N. It is also shown that electron temperature augments with the increase of E/N. Additionally, the dissociation ratio percentage of H2 rises with the increase of E/N.

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Fluid model of H‐form of the positive column in DC oxygen glow discharge

Cited by 4 publications

References 48 publications

The influence of oxygen concentration on the hollow cathode discharge in He/O₂ mixed gas

The influence of oxygen concentration on the hollow cathode discharge in He/O₂ mixed gas

R-Matrix Calculation of Electron Collisions with Molecular Oxygen in Its Electronically Excited States

Theoretical simulation of hydrogen glow discharge in the positive column of plasma sources

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Fluid model of H‐form of the positive column in DC oxygen glow discharge

Cited by 4 publications

References 48 publications

The influence of oxygen concentration on the hollow cathode discharge in He/O2 mixed gas

The influence of oxygen concentration on the hollow cathode discharge in He/O2 mixed gas

R-Matrix Calculation of Electron Collisions with Molecular Oxygen in Its Electronically Excited States

Theoretical simulation of hydrogen glow discharge in the positive column of plasma sources

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The influence of oxygen concentration on the hollow cathode discharge in He/O₂ mixed gas

The influence of oxygen concentration on the hollow cathode discharge in He/O₂ mixed gas