Hydrogen Combustion using IRC, AIMD and normal modes

The generation of reference data for deep learning models is challenging for reactive systems, and more so for combustion reactions due to the extreme conditions that create radical species and alternative spin states during the combustion process. Here, we extend intrinsic reaction coordinate (IRC) calculations with ab initio Molecular dynamics (AIMD) simulations and normal mode displacement calculations to more extensively cover the potential energy surface for 19 key reaction channels involved in hydrogen combustion. A total of ~290,000 potential energies and ~1,260,000 nuclear force vectors are evaluated with a high quality range-separated hybrid density functional, ωB97X-V, to construct the reference data set, including transition state ensembles, for the deep learning models to study hydrogen combustion reaction.