(8) Now, I can combine thermal adiabatic transitions for a particular pair of configurations to two new Markov chains combining the thermal and adiabatic transition rate for a particular pair of configurations 𝑣 ⃗. (9b) I am now interested in the rate 𝑟(𝑣 ⃗) at which elements from elements in 𝑅 become elements in 𝑃 and vice versa. Such a transition moves elements between the reactant and the product system, it is the decisive process of a chemical reaction. Only an adiabatic transition event moves an element from 𝑅 to 𝑃 and I can write: