lost (as H/H 2 ) the trend reverses and cleavage of terminal C-C bond leading to asymmetric breakup starts to dominate as shown in figure . Hydrogen migration is observed to be a very efficient process in our MD simulations. In this process, the "central H-atom" can migrate to (a) the "nearest terminal C-atom" or (b) the "furthest terminal C-atom" as shown in figure . H-migration is not observed within the simulation timescale of ∼1 ps at a very low excitation energy of E int of 0.01 eV. Thus, it is not a phenomena driven purely by the charge hole. The process (a) opens at 1eV (10% of trajectories lead to this tautomer) and becomes 47% of importance for 2.