Vibrational heat capacity of H2 molecules in low-voltage discharge plasma with molecular hydrogen

We have studied the energy balance in weakly ionized plasma of a low-voltage discharge, which operates in immobile molecular hydrogen due to ionization of a small additive of cesium ions. The main components in the energy flux are determined, which are transferred by plasma electrons and due to the heat conductivity of H2 molecules via the translational and rotational degrees of freedom, and (to the first approximation) an additional energy flux is evaluated that is transferred due to the vibrational heat conductivity. A criterion of smallness of the contribution due to vibrational heat conductivity to the energy balance of discharge plasma is formulated.