Reactive scattering of O and H$_2$ and quenching of OH at collision energies up to 4.4 eV

We report new cross sections for the O($^3$P) + H$_2$ reactive scattering as well as quenching rates for rotationally and vibrationally excited OH by H atoms for a range of collision energies from 0.4 and 4.4 eV. These processes are important for understanding non-local thermal equilibrium (non-LTE) regime in astrophysical environment such as photon-dominated regions (PDRs) and evolution of planetary atmospheres in time, including the atmospheres of Earth and Mars. The cross sections were calculated quantum mechanically using coupled-channel formalism implemented in MOLSCAT and ABC computer codes on refitted recent potential energy surfaces for $^3$A$'$ and $^3$A$''$, while the surface-hopping effects were estimated from models and similar atom-molecule reactions. A large basis set was used to ensure the convergence at higher energies. Our results agree well with the published data at lower energies and indicate that reduced-dimensionality approach at collision energies higher than about 1.5 eV may not be adequate. Differential cross sections and diffusion cross sections, of interest in transport calculations, are also reported.