High-energy reaction dynamics of O3

Abstract

The high-temperature atom exchange and dissociation reaction dynamics of the O(3P) + O2(Σg−3) system are investigated based on a new reproducing kernel-based representation of high-level multi-reference configuration interaction energies. Quasi-classical trajectory (QCT) simulations find the experimentally measured negative temperature-dependence of the rate for the exchange reaction and describe the experiments within error bars. Similarly, QCT simulations for a recent potential energy surface (PES) at a comparable level of quantum chemical theory reproduce the negative T-dependence. Interestingly, both PESs feature a “reef” structure near dissociation, which has been implicated to be responsible for a positive T-dependence of the rate, inconsistent with experiments. For the dissociation reaction, the T-dependence correctly captures what is known from experiments but underestimates the absolute rates by two orders of magnitude. Accounting for an increased number of accessible electronic states at high temperatures yields near-quantitative agreement. A neural network-based state-to-distribution model is constructed for both PESs and shows good performance in predicting final translational, vibrational, and rotational product state distributions. Such models are valuable for future and more coarse-grained simulations of reactive hypersonic gas flow.