The first run is a reference TSH trajectory at the PBE0 level, while the In Fig. , the potential energy of the three lowest singlet states obtained from the reference PBE0 trajectory is represented. The trajectory starts in the second excited state and hops to the first excited state in less than 10 fs. The system stays in the first excited state for the next 70 fs until it intersects with and hops into the ground state. All trajectories are stopped whenever they collapse into the ground state.