For comparison, we show in Figure (c/d) a trajectory that traverses via the triplet pathway, first relaxing to the adiabatic T 1 state (80 fs), before it reaches the ground state S 0 . In this case, i.e., when reaching the adiabatic S 0 state from the triplet manifold, the states takes immediately diabatic S 0 character and separates in energy from the other electronic states. Before re-entering the singlet manifold, Lines depict electronic potentials of all states during the simulation. Black circles denote the active state during the simulation. Line color refers to spin expectation value S 2 of the electronic states: 0 (blue), 1 (green), 2 (red). Top panel: geometries from the beginning of the dynamics and at the transition between the S * 0 /S 0 and T 1 /S 0 states.