The temporal profiles at the longer wavelength region in the nanosecond range are shown in Figure . By the least squares fit using exponential functions, the time constants of signal decay were determined to be 15 ± 2.5 ns in toluene and <1 ns in THF. Because these values are close to those of the prompt fluorescence of q-eq. in each solvent, 16 ± 0.1ns in toluene and 0.97 ± 0.01 ns in THF, all the TA spectra after 20 ps are assigned to the transient absorption from S1 in q-eq. These assignments