(a)
(b)
(c)
(d)
Figure 5: The variations with time of (a) the HOMO and LUMO energies; (b) the time-dependent population of stacked benzene and ethylene system in synchronous mode, which is subjected to a laser with frequency of 4.7 eV and fluency of 96.93 Jm−2; (c) and (d) are the HOMO and LUMO energies and the time-dependent population in asynchronous mode, which is subjected to a laser with frequency of 4.7 eV and fluence of 94.11 Jm−2.