Elementary Processes and Kinetic Modeling for Hydrogen and Helium Plasmas

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Roberto Celiberto ; Mario Capitelli ; Gianpiero Colonna ; Giuliano D’Ammando ; Fabrizio Esposito ; Ratko K. Janev ; Vincenzo Laporta ; Annarita Laricchiuta ; Lucia Daniela Pietanza ; Maria Rutigliano ; Jogindra M. Wadehra (2017)
  • Publisher: MDPI AG
  • Journal: Atoms (issn: 2218-2004)
  • Related identifiers: doi: 10.3390/atoms5020018
  • Subject: elementary processes in plasma | electron-impact resonant excitation | atom-diatom vibration-translation energy transfer | hydrogen recombination on graphite | kinetics of H2/He plasmas | Nuclear and particle physics. Atomic energy. Radioactivity | QC770-798

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.
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