In more detail, in the case of Ama + , for the considered excitation energy window of eV, the major part of the initial population is in D 2 (0.5) and D 1 (0.3), and a smaller fraction (0.2) in D 3 (Fig. ). The D 2 and D 3 states decay very fast, giving rise to D 1 population rise at short times. The D 1 state, in turn, decays to D 0 again very quickly, resulting in the recovery of the ground state (D 0 ) with the time constant τ ≈ 25 fs. This time is comparable to the corresponding time constants for Ada + , obtained for initial excitation energies < 3 eV, which are between 10 fs and 40 fs .