Reactive collisions for NO(Π) + N(S) at temperatures relevant to the hypersonic flight regime.

The NO(XΠ) + N(S) reaction which occurs entirely in the triplet manifold of NO is investigated using quasiclassical trajectories and quantum simulations. Fully-dimensional potential energy surfaces for the A' and A'' states are computed at the MRCI+Q level of theory and are represented using a reproducing kernel Hilbert space. The N-exchange and N-formation channels are followed by using the multi-state adiabatic reactive molecular dynamics method. Up to 5000 K these reactions occur predominantly on the NO A'' surface. However, for higher temperatures the contributions of the A' and A'' states are comparable and the final state distributions are far from thermal equilibrium. From the trajectory simulations a new set of thermal rate coefficients of up to 20 000 K is determined. Comparison of the quasiclassical trajectory and quantum simulations shows that a classical description is a good approximation as determined from the final state analysis.