Transient absorption spectra of pinacyanol and cyanine photoisomers obtained with a sync-pumped picosecond dye laser and independently tunable probe light

We have measured the absorption difference spectra and quantum yields of photoisomers of pinacyanol iodide and 1,1′-diethyl-4,4′-cyanine iodide on a picosecond time scale using syne-pumped picosecond dye laser pulses for excitation and independently tunable analyzing light.