Journal ArticleDOI
Progress in the non-equilibrium vibrational kinetics of hydrogen in magnetic multicusp H - ion sources
Claudine Gorse,Mario Capitelli,M. Bacal,J. Bretagne,Antonio Laganà +4 more
- Vol. 117, Iss: 2, pp 177-195
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TLDR
In this paper, a complete set of V-T (vibrational translation) rates involving H-H 2 (v ) collisions, calculated by using a three-dimensional dynamics approach, has been inserted into a self-consistent model for better representing the corresponding relaxation.Abstract:
The non-equilibrium vibrational kinetics of H 2 in multicusp magnetic discharges has been studied by improving a previous model developed by our groups. In particular, a complete set of V-T (vibrational translation) rates involving H-H 2 ( v ) collisions, calculated by using a three-dimensional dynamics approach, has been inserted into our self-consistent model for better representing the corresponding relaxation. Different experimental situations are simulated with special emphasis on the temporal scales necessary for the different distributions (electron energy and vibrational distributions) to reach stationary values. Finally, a comparison between theoretical and experimental quantities such as vibrational temperature, electron temperature, electron number density and concentration of negative ions (H − ) shows a satisfactory agreement, thus indicating the basic correctness of our model.read more
Citations
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Journal ArticleDOI
Self-consistent kinetic model of low-pressure - flowing discharges: I. Volume processes
TL;DR: In this paper, a kinetic model of low-pressure DC flowing discharges in - mixtures is presented, where the only input parameters are those that can externally be chosen in experiments, such as total gas pressure, radius and length of the discharge tube, discharge current, gas flow rate and initial gas temperature and composition.
Journal ArticleDOI
Electron and heavy particle kinetics in a low-pressure nitrogen glow discharge
Vasco Guerra,J Loureiro +1 more
TL;DR: In this article, a detailed kinetic model is used to investigate the mechanisms for ionization, dissociation and atomic reassociation in a low-pressure positive column, based on the selfconsistent solutions to the electron Boltzmann equation coupled to a system of rate balance equations for the levels, the electronically excited states of and the and ions.
Journal ArticleDOI
The IST-LISBON database on LXCat
TL;DR: LXCat as discussed by the authors is a web-based, community-wide project on the curation of data needed in the modelling of low-temperature plasmas, which is organized in databases, contributed by members of the community around the world.
Journal ArticleDOI
Plasma recombination and divertor detachment
TL;DR: It is concluded that plasma recombination is a strongly contributing mechanism for the explanation of divertor plasma detachment in low temperature plasmas.
Journal ArticleDOI
Chemical kinetics and energy transfer in moderate pressure H2 plasmas used in diamond MPACVD processes
TL;DR: In this paper, a kinetic model for moderate-pressure microwave H2 plasmas obtained in diamond deposition reactors is presented, which involves three groups of reactions which describe the vibrational kinetics of H2, the chemistry of H 2 and H electronically excited states and the groundstate species kinetics, respectively.
References
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Journal ArticleDOI
An accurate three‐dimensional potential energy surface for H3
P. Siegbahn,B. Liu +1 more
TL;DR: In this paper, an accurate three-dimensional potential energy surface for H3 has been obtained by the configuration interaction (CI) method, with the energy of the saddle point taken to be zero, are believed to lie within 0.1 kcal/mole of the exact clamped nuclei limit.
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Functional representation of Liu and Siegbahn’s accurate ab initio potential energy calculations for H+H2
TL;DR: In this article, Liu and Siegbahn made an accurate least square fit to the potential energy surface start for H+H2 with a root-mean-square error of 0.17 kcal/mol.
Journal ArticleDOI
Ab initio potential energy surface for linear H3
TL;DR: In this article, the configuration interaction (CI) method has been applied to determine an accurate potential energy surface for linear H3, and the calculated surface is believed to lie no more than 0.8 kcal/mole and no less than 2.2 kcal /mole above the exact surface, a significant improvement over all previous calculations.
Journal ArticleDOI
Rovibrational molecular populations, atoms, and negative ions in H2 and D2 magnetic multicusp discharges
TL;DR: In this paper, the authors applied coherent anti-Stokes Raman scattering to the study of rovibrational populations in magnetic multicusp H2 and D2 discharges, and found that the populations of high-lying rotational states (J≳5) in the vibrational levels v=0, 1, and 2 are significantly higher than expected from the Boltzmann law.
Journal ArticleDOI
Vibrational excitation and negative-ion production in magnetic multicusp hydrogen discharges
TL;DR: In this article, a selfconsistent approach based on the simultaneous solution of the vibrational master equation, the Boltzmann equation and the plasma chemistry describing the dissociation process has been used to obtain: (a) vibrational distributions, (b) electron energy distribution functions, (c) electron number densities ( n c ) and electron temperatures ( T c ), (d) degree of dissociation, and (e) concentration of negative ions ( N H − ) in magnetic multicusp H 2 plasmas.