s the hydrogen atom from the other, the products would be HC(O)OH and CO2. If the two HOCO radicals form an intermediate oxalic acid (HOC(O)C(O)OH) complex, the products could be H2O, CO and CO2, or two CO2 and H2. The dynamics will be carried out using a dual level ab initio method. The aim of this research is to determine the mechanism and product branching ratio as well as rate coefficients....