Initiation
Propagation
First Branching
Forward
RIF = KIF × H2 × O2
RPF = KPF × HO × H2
R1F = K1F × H × HO
Backward
RIB = KIB × HO × HO / 2
RPB = KPB × H × H2O
R1B = K1B × O × H2