Numerical results for population dynamics of the donor (blue solid line with open squares), the acceptor (red solid line with open up triangles) and the vibrational mode (black solid line), the coupling between the donor and the vibrational mode is g/V₁₂ = 0 in panels (a) and (c), while that in panels (b) and (d) is g/V₁₂ = 1.5. Other parameters used here are the same as those in Eq. (8).