On the reliability of low-pressure dc glow discharge modelling

Donkó, Zoltán; Hartmann, P.; Kutasi, Kinga

doi:10.1088/0963-0252/15/2/002

Cited by 86 publications

(80 citation statements)

References 74 publications

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“…Recent complex numerical models [32][33][34][35][36][37][38][39], categorized as fluid, kinetic (Monte Carlo), and hybrid (combination), have shown that the modeled discharge characteristics are seriously influenced by the accuracy of the input data. Models require realistic cross sections for electron, ion, atom and photon collisions with the gas, as well as realistic probabilities for electron, ion, atom and photon interactions with electrode surfaces.…”

Section: The Role Of Ion-induced Electron Emission In Glow Dischargesmentioning

confidence: 99%

Electron Emission from Surfaces Induced by Slow Ions and Atoms

Baragiola

Riccardi

2008

Springer Series in Materials Science

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Electron emission from surfaces is of crucial importance in determining the properties of electrical discharges, where it is caused by the impact of ions, atoms, electrons, and photons. At the microscopic level, the physics of electron emission from solid targets is usually described by a three-step model: electron excitation, electron transport to the surface, and its escape through the surface. This division serves a heuristic purpose and it must be borne in mind that, in purely surface events, actually only one step is involved. What distinguishes electron emission by different incoming particles is the excitation step [1], which depends strongly on the momentum of the particle. This is because there is a minimum energy needed to extract an electron from the solid (work function for metals, band gap plus electron affinity for nonmetals) and this energy transfer implies a momentum transfer from the projectile.This chapter is concerned with heavy particle collisions (ions and atoms) at low energies (below a few keV) and will discuss first the physical mechanisms and then applications to electrical discharges in gases. The overall picture of electron emission induced by heavy particles is the following. Electrons are excited from the target or the projectile as a result of Coulomb interactions involving the nuclei and electrons through mechanisms that are grouped in two categories, potential and kinetic, depending on the source of the excitation energy. Such excitations occur mostly in binary collisions at the surface or very shallow depths, since the penetration depth of low-energy atomic projectiles is usually very shallow, tens of nm or less. The excited electrons can be ejected directly into vacuum or undergo a series of collisions in the target solid (electron transport) on their way to the surface. The collisions are either elastic scattering with atomic cores, which cause large deflections in trajectories, or energy loss collisions by scattering with other electrons, contingent on the availability of electronic states. As a result of such inelastic scattering, the electrons which succeed in escaping the solid come from a shallow depth, of the order of 2 nm for metals and semiconductors and up to a few tens of

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Section: The Role Of Ion-induced Electron Emission In Glow Dischargesmentioning

confidence: 99%

Electron Emission from Surfaces Induced by Slow Ions and Atoms

Baragiola

Riccardi

2008

Springer Series in Materials Science

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“…The transport of electrons (and ions) and the coupling of the charged particle transport to electromagnetic fields can be described using different levels of models ranging from macroscopic "fluid models" [1], to "hybrid models" [2], or to detailed kinetic models such as "particle in cell/Monte Carlo collision" (PIC-MCC) simulations [3]. Data needs for modeling depend on the level of description, but in all cases the needs are extensive.…”

Section: Introductionmentioning

confidence: 99%

The LXCat project: Electron scattering cross sections and swarm parameters for low temperature plasma modeling

Pancheshnyi¹,

Biagi²,

Bordage³

et al. 2012

Chemical Physics

274

232

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“…After all fast electrons within MCC cycle have escaped from the volume or converted to the slow electrons, the ionization events data is interpolated into the grid points in order to determine the ionization rate profile. The ionization source profile is weighted to the actual value using the equation [11,17] S i,e = j (1 + 1/γ)∆x…”

Section: Simulation Of Fast Electronsmentioning

confidence: 99%

“…Within the kinetic (particle) methods, which provide quantitatively accurate results, particle species are simulated by the suitable number of super particles [6,7,2]. Hybrid methods are partially fluid and partially kinetic [8,9,10,11].…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional hybrid model for a glow discharge: comparison with fluid and kinetic (particle) models, reliability and accuracy

Eylenceoǧlu¹,

Rafatov²

2014

J. Phys.: Conf. Ser.

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View the article online for updates and enhancements. Two-dimensional hybrid model for a glow discharge: comparison with fluid and kinetic (particle) models, reliability and accuracy E Eylenceoglu and I RafatovMiddle East Technical University, Ankara, Turkey E-mail: eender@metu.edu.trAbstract. We developed and tested a two-dimensional Monte Carlo -fluid hybrid numerical code for the DC glow discharge simulations. The model is based on the separation of electrons into two parts, namely, the low energetic (slow) and high energetic (fast) groups. Ions and slow electrons are described within the fluid model using the drift-diffusion approximation for particle fluxes. Electrostatic field is obtained from the solution of Poisson equation. Fast electrons, represented by the appropriate number of super particles emitted from the cathode, are responsible for ionization processes in the discharge volume. Test calculations were carried out for the argon plasma. The vortex current formation in a DC discharge is observed in the case of rectangular geometry.

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On the reliability of low-pressure dc glow discharge modelling

Cited by 86 publications

References 74 publications

Electron Emission from Surfaces Induced by Slow Ions and Atoms

Electron Emission from Surfaces Induced by Slow Ions and Atoms

The LXCat project: Electron scattering cross sections and swarm parameters for low temperature plasma modeling

Two-dimensional hybrid model for a glow discharge: comparison with fluid and kinetic (particle) models, reliability and accuracy

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