Figure 2. Pump-probe absorption spectroscopy of POR-Pchlide-NADPH samples after photoexcitation with a laser pulse.

The laser pulse was centred at ∼475 nm. Transient absorption difference spectra at delay times of 2, 17, 492 and 2992 ps after excitation are shown for the average of scans 1–3 (A), scans 8–10 (B) and scans 18–20 (C).