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Open AccessFeature PaperArticle

Elementary Processes and Kinetic Modeling for Hydrogen and Helium Plasmas

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Dipartimento di Ingegneria Civile, Ambientale, del Territorio, Edile e di Chimica, Politecnico di Bari, Bari 70125, Italy
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PLASMI Lab, CNR NANOTEC, Bari 70126, Italy
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Macedonian Academy of Sciences and Arts, PO Box 428, 1000 Skopje, Macedonia
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Physics Department, Wayne State University, Detroit, MI 48201, USA
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Department of Physics and Astronomy, University College London, London WC1E 6BT, UK
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Author to whom correspondence should be addressed.
Academic Editors: Bastiaan J. Braams, Xavier Urbain, Detlev Reiter and Viatcheslav Kokoouline
Atoms 2017, 5(2), 18; https://doi.org/10.3390/atoms5020018
Received: 30 November 2016 / Revised: 20 March 2017 / Accepted: 20 April 2017 / Published: 2 May 2017
(This article belongs to the Special Issue Atomic and Molecular Data for Hydrogen and Helium in Fusion Plasma)
We report cross-sections and rate coefficients for excited states colliding with electrons, heavy particles and walls useful for the description of H 2 /He plasma kinetics under different conditions. In particular, the role of the rotational states in resonant vibrational excitations of the H 2 molecule by electron impact and the calculation of the related cross-sections are illustrated. The theoretical determination of the cross-section for the rovibrational energy exchange and dissociation of H 2 molecule, induced by He atom impact, by using the quasi-classical trajectory method is discussed. Recombination probabilities of H atoms on tungsten and graphite, relevant for the determination of the nascent vibrational distribution, are also presented. An example of a state-to-state plasma kinetic model for the description of shock waves operating in H 2 and He-H 2 mixtures is presented, emphasizing also the role of electronically-excited states in affecting the electron energy distribution function of free electrons. Finally, the thermodynamic properties and the electrical conductivity of non-ideal, high-density hydrogen plasma are finally discussed, in particular focusing on the pressure ionization phenomenon in high-pressure high-temperature plasmas. View Full-Text
Keywords: elementary processes in plasma; electron-impact resonant excitation; atom-diatom vibration-translation energy transfer; hydrogen recombination on graphite; kinetics of H2/He plasmas elementary processes in plasma; electron-impact resonant excitation; atom-diatom vibration-translation energy transfer; hydrogen recombination on graphite; kinetics of H2/He plasmas
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Celiberto, R.; Capitelli, M.; Colonna, G.; D’Ammando, G.; Esposito, F.; Janev, R.K.; Laporta, V.; Laricchiuta, A.; Pietanza, L.D.; Rutigliano, M.; Wadehra, J.M. Elementary Processes and Kinetic Modeling for Hydrogen and Helium Plasmas. Atoms 2017, 5, 18.

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