Abstract
The dissociation kinetics of diatomic species in non-equilibrium plasmas is presented and discussed on the basis of three mechanisms: 1) the direct electron impact mechanism (DEn) ; 2) the pure vibrational mechanism (PVM) ; the joint vibroelectronic mechanism (JVE). Calculated dissociationrates from PVM are in satisfactory agreement with the experimental ones in N2. while in CO the agreement with the experimental results is better achieved by the JVE rates. The coupling between JVE and Boltzmann equation for the electron energy di— stribution function is then discussed for H2 and 02. DELI plays an important role in dissociating these molecule at high E/N, by determining in the presence of recombination process a new dissociation mechanism, called a recombination assisted dissociation process. Finally the effect of vibrational non-equilibrium in the synthesis of NO and on the dissociation of polyatomic molecules is discussed.
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