—The triplet states of the n ‐butyl‐amine Schiff bases of 11‐ cis , 9‐ cis , 13‐ cis and all‐ trans retinal are produced via triplet‐triplet energy transfer. Their absorption spectra, peaking around 435 nm, and their decay kinetics are recorded using pulsed‐laser photolysis. Direct‐excitation (φ …