An Evaluation of Gas Phase Enthalpies of Formation for Hydrogen-Oxygen (HO) Species.

We have compiled gas phase enthalpies of formation for nine hydrogen-oxygen species (HO) and selected recommended values for H, O, OH, HO, HO, HO, O, HO, and HO. The compilation consists of values derived from experimental measurements, quantum chemical calculations, and prior evaluations. This work updates the recommended values in the NIST-JANAF (1985) and Gurvich et al. (1989) thermochemical tables for seven species. For two species, HO and HO (important in atmospheric chemistry) and not found in prior thermochemical evaluations, we also provide supplementary data consisting of molecular geometries, vibrational frequencies, and torsional potentials which can be used to compute thermochemical functions. For all species, we also provide supplementary data consisting of zero point energies, vibrational frequencies, and ion reaction energetics.