Fig. 2: Photo-induced TA spectra of Chl-A solution and film.

a The pristine Chl-A solution and the ones (b) purged with N2 gas or (c) blended with HQ excited at 650 nm (Qy band of Chl-A solution), and (d) a neat Chl-A film and the ones blended with (e) all-trans-β-carotene or (f) HQ excited at 737 nm (Qy band of Chl-A film). The gray broken-dotted line represents the inverted steady-state absorption spectrum of each sample for comparison.