This demonstrates that in the collective limit, PMET reactions from the UP to the acceptor state of the jth molecule only depend on the PESs along the reaction coordinate of the jth molecule. To determine reaction parameters such as the reorganization energy and the driving force, the energy differences X min+ +A j and X minA j +A j that minimize the energies of states |+⟩ and |A j ⟩, respectively, along R RC +A j (X) can be used. The corresponding reorganization energy λ +A j between states |+⟩ and |A j ⟩ is