In our Born-Oppenheimer Molecular Dynamics (BOMD) simulations, the loss of neutral fragments appears as a major route for dissipation of excess energy for butadiene dications and it depends sensitively on the internal energy. For 25 eV of internal energy, the branching ratio of trajectories with loss of one or more neutral particles (H/H 2 ) is as high as 91% while for 10 eV this ratio is 35% as evidenced from figure .