Analysis of the H2 vibrational distribution in a hydrogen discharge

Hiskes, J. R.; Karo, A. M.

doi:10.1063/1.100914

Cited by 62 publications

(49 citation statements)

References 16 publications

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“…The wall quenching coefficient c q is the probability that represents the de-excitations in collisions of the vibrational excited molecules or the excited atoms with the wall. c q of H 2 , c q; H 2 , is varied with v, and the relevant data from Hiskes and Karo, 62 and Taccogna et al 63 were used in the model. The excited atoms undergoing collisions with the wall were assumed to be de-excited to the ground states, so that c q; H ¼ 1.…”

Section: Surface Reaction Of the Neutral Speciesmentioning

confidence: 99%

Global model analysis of negative ion generation in low-pressure inductively coupled hydrogen plasmas with bi-Maxwellian electron energy distributions

et al. 2015

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A global model was developed to investigate the densities of negative ions and the other species in a low-pressure inductively coupled hydrogen plasma with a bi-Maxwellian electron energy distribution. Compared to a Maxwellian plasma, bi-Maxwellian plasmas have higher populations of low-energy electrons and highly vibrationally excited hydrogen molecules that are generated efficiently by high-energy electrons. This leads to a higher reaction rate of the dissociative electron attachment responsible for negative ion production. The model indicated that the bi-Maxwellian electron energy distribution at low pressures is favorable for the creation of negative ions. In addition, the electron temperature, electron density, and negative ion density calculated using the model were compared with the experimental data. In the low-pressure regime, the model results of the biMaxwellian electron energy distributions agreed well quantitatively with the experimental measurements, unlike those of the assumed Maxwellian electron energy distributions that had discrepancies. V C 2015 AIP Publishing LLC. [http://dx.

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Section: Surface Reaction Of the Neutral Speciesmentioning

confidence: 99%

Global model analysis of negative ion generation in low-pressure inductively coupled hydrogen plasmas with bi-Maxwellian electron energy distributions

et al. 2015

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“…This distribution can be easily inverted, i.e. the energy of the reflected particle can be calculated according to [18] and [19]) During the simulation the motion of all particle is fully resolved. The size of the spatial cell is smaller that Debye length.…”

Section: Wallmentioning

confidence: 99%

Self‐Consistent Simulations of the Plasma‐Wall Transition Layer

Tskhakaya

Kühn

Tomita

et al. 2008

Contrib. Plasma Phys.

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In the present work we develop a 1d3v (1D in space and 3D in velocity) kinetic Particle-in-cell model of the magnetised plasma-wall transition layer, where the charged and neutral particle dynamics and interaction between them is included in a fully self-consistent way. The plasma-surface interactions are described via fixed emission coefficients for the secondary particles. We obtained different profiles of plasma and neutral particles and cross-checked classical boundary conditions, which are usually formulated inside the PWT.

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“…͑5͒ The average number of wall collisions by a test molecule is used to estimate the wall deexcitation of the vibrational level (vЉ). 12 The wall deexcited molecules are then redistributed among lower vibrational states according to weight factors w i (0Ͻw i Ͻ1; ⌺w i ϭ1). w i varies exponentially with vЉ.…”

Section: A Neutral Transport Codementioning

confidence: 99%

Simulation of negative hydrogen ion production and transport

Bandyopadhyay

Wilhelm

2004

Review of Scientific Instruments

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Negative hydrogen ion production by volume process and its transport in a negative hydrogen ion source has been simulated by a combination of three three-dimensional Monte Carlo codes: (1) neutral transport, (2) negative hydrogen ion production, and (3) negative hydrogen ion transport. Neutral transport code has been used to calculate the spatially resolved density spectrum nv of the vibrationally excited H2 molecules. With the negative hydrogen ion production code, the production and distribution of H− ion density n− in the discharge volume has been calculated. And with the negative hydrogen ion transport code, the calculation of the survival probability of H− ions up to the extraction grid has been carried out. In all cases, the experimentally observed plasma parameters, as well as background gas density and temperature profiles, are inputs during trajectory calculation. It has been found that the negative ion density is almost uniform from the ion production zone (driver) to the grid. However, H− ions, which are produced within a few centimeters from the grid, are only able to reach the extraction hole. To compare the code calculation, a zero-dimensional particle balance rate equation is also solved.

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Analysis of the H2 vibrational distribution in a hydrogen discharge

Cited by 62 publications

References 16 publications

Global model analysis of negative ion generation in low-pressure inductively coupled hydrogen plasmas with bi-Maxwellian electron energy distributions

Global model analysis of negative ion generation in low-pressure inductively coupled hydrogen plasmas with bi-Maxwellian electron energy distributions

Self‐Consistent Simulations of the Plasma‐Wall Transition Layer

Simulation of negative hydrogen ion production and transport

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