Figure shows the microcanonical rates for relevant intermediates. For γRO 2 , the γ-αQOOHIsom pathway is dominant at the lower energies and is taken over by the rate to reform γR + O 2 only at higher energies. At high energies, other product channels such as γ-γQOOHIsom and γHO2ElimFromRO2 also have competitive rates.