Elementary Processes and Kinetic Modeling for Hydrogen and Helium Plasmas
Article
English
OPEN
Roberto Celiberto
;
Mario Capitelli
;
Gianpiero Colonna
;
Giuliano Dâ€™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: 22182004)

Related identifiers:
doi: 10.3390/atoms5020018

Subject:
elementary processes in plasma  electronimpact resonant excitation  atomdiatom vibrationtranslation energy transfer  hydrogen recombination on graphite  kinetics of H2/He plasmas  Nuclear and particle physics. Atomic energy. Radioactivity  QC770798
We report crosssections 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 crosssections are illustrated. The theoretical determination of the crosssection for the rovibrational energy exchange and dissociation of H 2 molecule, induced by He atom impact, by using the quasiclassical 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 statetostate plasma kinetic model for the description of shock waves operating in H 2 and HeH 2 mixtures is presented, emphasizing also the role of electronicallyexcited states in affecting the electron energy distribution function of free electrons. Finally, the thermodynamic properties and the electrical conductivity of nonideal, highdensity hydrogen plasma are finally discussed, in particular focusing on the pressure ionization phenomenon in highpressure hightemperature plasmas.