Fig. 4. White-light supercontinuum fs-TA measurements. Differential transmission (–ΔT/T) as function of pump–probe delay time and probe wavelength for P-M pumped at 320 nm (a) and P-DT pumped at 375 nm (d). (b) Dynamics for P-M at 555 nm, dark state formation and decay, the inset is early buildup dynamics for the dark state, triplet formation at 495 nm (vertical cuts from figure a). (c) Schematic illustration of the processes in P-M after photo-excitation. (e) and (f): ultrafast intersystem crossing for P-DT. Dynamics for singlet (437 nm) and triplet (500 nm and 590 nm) excitons. All measurements were performed at room temperature.