Then we modelled nonadiabatic dynamics after excitation to the ππ * band, starting in the brightest ππ * state. This state was in most cases S 8 but not always. Namely, it was always S 8 for tetramer 3.5 Å. For SAM 3.5 Å, one trajectory was launched from S 9 . For tetramer 5.5 Å, eleven trajectories started in S 7 . And for SAM 5.5 Å, 19 trajectories were launched from S 7 and one from S 6 . The electronic state populations, grouped in nπ * and ππ * manifolds (plus the ground state), are shown in Figure . For the tetrameric models, the nπ * manifold includes states S 1 -S 4 , whereas the ππ * manifold states S 5 -S 12 . For the monomer, nπ * is S 1 and ππ * is S 2 . We fitted population curves as follows: