Translational energy dependence of NO+NO/N2+O2 product branching in the O(1D)+N2O reaction: a classical trajectory study on a new global potential energy surface for the lowest 1A′ state

An analytical potential energy surface of the lowest singlet 1A′ state for the O(1D)+N2O→NO+NO/N2+O2 reaction has been developed on the basis of extensive ab initio electronic structure calculations at the CASPT2/cc-pVDZ level of theory within Cs constraint. A many-body expansion type function was employed to fit the calculated ab initio points. Classical trajectory calculations have been carried out using the newly developed potential energy surface. We found that the initial orientation angle significantly affects the NO+NO/N2+O2 product branching and the branching ratio decreases as the relative translational energy increases.