The two can be identified by monitoring the oscillatory patterns in the hot GSB signals. Fig. (d) shows the hot GSB signal for the trajectories producing the trans-azobenzene. After 25 fs, the signal shifts to the blue following the torsional motion in panel (f). Then the signal remains in the domain around 3.0 eV, which is consistent with the behavior of the trajectories producing trans-azobenzene. The hot GSB signal in panel (e) is calculated for the trajectories producing cis-azobenzene. The first stage of its evolution is quite similar to that of its transcounterpart, since both move to the blue following the torsional motion in panel (f). At longer times, however, a portion of trajectories producing the cis-signal returns to the low-energy domain. The reason is as follows: these trajectories experience further torsional motion after the cis-configuration is achieved. The cis-azobenzene has a stronger TDM to the excited states than the trans-azobenzene (see Tables and). Hence the total hot GSB signal is dominated by the cis-azobenzene.