Supporting information for Papagiannakis et al. (April 23, 2002) Proc. Natl. Acad. Sci. USA, 10.1073/pnas.092626599.
Fig. 6.
Multiexponential fits of the kinetic trace measured at 860 nm, where BChl shows bleach and stimulated emission, after excitation of spheroidene. In both cases part of the rise of the signal is instantaneous, depicting the ultrafast S2–bacteriochlorophyll energy transfer, which cannot be resolved on the grounds of this trace alone. Furthermore, in A the rise of the signal was fitted with two additional components, yielding time constants of 1.1 ± 0.1 and 4.5 ± 0.3 ps, with amplitudes of 50 and 17%. In B the rise was fitted with three additional components reaching a much higher quality as seen from the residuals of the fit, which are shown (Inset) in both cases. The estimated time constants in this case are 350 ± 50 fs, 1.5 ± 0.1 ps, and finally 5.8 ± 0.5 ps. The relative amplitudes are 30, 50, and 11%. In both graphs the squares represent the measured signal, and the black line represents the fits. The colored lines depict the fraction of each component, with the red line showing in both cases the slower rise component. The blue line is the fraction of the long-lived (ns) decay component that follows the rise. Notice that the scale is linear up to 10 ps and logarithmic from 10 to 100 ps. a.u., arbitrary units.