5.

(a) Early time scale femtosecond TA data recorded for DHAQ in THF (λ_ex = 282 nm, excitation fluence = 235 μJ/cm², absorption ≈2.5 at the excitation wavelength), arrows guide spectral evolution. (b) Late time scale femtosecond TA data recorded for DHAQ in THF (λ_ex = 280 nm, excitation fluence = 330 μJ/cm², absorption ≈0.59 at the excitation wavelength). (c) Kinetics monitored at indicated wavelengths from a), together with global fits. (d) Kinetics monitored at indicated wavelengths from (b), together with global fits.