A barrier on the order of 400 cm -1 prevents the system from undergoing ultrafast nonradiative decay through a 1 ππ*/S 0 CI. Therefore, some amount of the wavepacket will relax possibly via fluorescence at the S 1 minimum while the remainder eventually finds its way to a nonradiative decay channel by puckering at the C 6 -NH 2 group (Fig. ). With increased excitation energy, no amount of fluorescence is observed, presumably outcompeted by the more efficient nonradiative decay.