Quantum mechanical and quasiclassical Born-Oppenheimer dynamics of the reaction N2(X1Sigmag+)+O(3P)->N(4S)+NO(X2Pi) on the N2O a3A" and b3A' surfaces

We present the quantum mechanical (QM) and quasiclassical trajectory (QCT) dynamics of the title reac- tion on two uncoupled surfaces, using a wavepacket (WP) method and considering some N2(v, j) vibra- tional and rotational states. The reaction is investigated by calculating initial-state-resolved reaction probabilities, cross sections, and rate constants, which are explained in terms of energy profiles and col- lision mechanisms. These properties reflect the large endo-thermicity of the reaction and the features of the surfaces. Indeed, at low v values we obtain large thresholds and the lower surface is more reactive than the higher one, whereas at high v the thresholds decrease or disappear and the upper surface becomes more reactive. QM and QCT results are in satisfactory agreement, except some differences at low or high collision energy and temperature. QCT rate coefficients agree also with some published results. WP snapshots and movies of QCT time evolution show clearly abstraction and insertion mecha- nisms depending on the initial conditions. Insertion proceeds via a reaction complex and we observe a QM Feshbach resonance for a specific initial condition. On the overall, the dynamical observables are con- sistent with the collision mechanisms.