FIGURE 1.

Kinetics at selected wavelengths. (A) The decay at 550 nm probe wavelength is biexponential with a precursor (S^*) that decays within τ = 10.3 ± 0.8 ps into a long-lived state (T) with τ > 300 ps. (B) Kinetics of the S₁ state. The decay at 580-nm probe wavelength is 95% monoexponential with τ = 3.7 ± 0.1 ps. The inset shows the increasingly faster decay times at red-shifted probe wavelengths, reflecting vibrational cooling of the S₁ state. (C) Kinetics of BChl B850. The dashed horizontal line is a guide to the eye, to show the 12% of population growth from slower components.