Temperature dependence of the rate coefficient of formation of CN radical from C + NH

Abstract Rate coefficients of the complex-forming C + NH → H + CN reaction have been calculated at temperatures ranging from 5 K to 800 K using quasi-classical trajectories on a potential energy surface which accurately describes attractive long-range interaction, along with results two capture models. In contrast constant value recommended in astrochemical databases, steep decrease rates has found up 150 K, and then they tends be nearly constant. Such behavior is analyzed terms rovibrational state-selected rate cross sections singling out role played by rotational excitation initial diatom. The effect electronic degeneracy also discussed.