Figure 5. Decay of the transient absorption of triad 1 in 2-methyltetrahydrofuran at 700 nm following excitation with a 5-ns, 625-nm laser pulse. (a) At 16 K, the slow part of the decay is fit with a single exponential of 70 m s. (b) At 130 K, the time constant is 55 m s (smooth curve). (c) At 190 K, the lifetime is 3.8 m s (smooth curve; note the change in time scale on the plot).