which is half the experimental chemical potential of an O 2 molecule minus its zero-Kelvin bond dissociation energy E O 2 ,diss . The experimental oxygen chemical potential was determined via the Showmate equation using parameters from the thermochemical tables of the NIST-JANAF. The bond dissociation energy of the O 2 molecule (E O 2 ,diss = 5.59 eV ) was calculated using ReaxFF.