Second Branching

Termination by wall destruction

Forward

$\text{R2F}=\text{K2F}\times \text{O}\times \text{HO}$

$\text{RTF}=\text{KTF}\times \text{H}\times \text{H}/\text{2}$

Backward

$\text{R2B}=\text{K2B}\times \text{H}\times \text{O2}$

$\text{RTB}=\text{KTB}\times \text{H2}$