The authors demonstrate transient absorption spectroscopy with picosecond time resolution and nanometer spectral resolution over the entire visible region. To resolve multiple discrepancies in the literature, they studied 3,3'-diethyloxadicarbocyanine iodide, measuring both excited singlet lifetime and ground state depletion and recovery. The kinetics of the two processes are the same. They report fluorescence yield determinations and comment on the controversy over photoisomer generation. (Modified author abstract).