Fluorescence Spectroscopic Analysis of N and P Isomers of DODCI

The photoisomerization dynamics of DODCI (3,3′-diethyloxadicarbocyanine iodide) is analyzed by linear absorption and fluorescence spectroscopic measurements over a wide temperature range. The fluorescence quantum distributions and the fluorescence quantum efficiencies are measured for three excitation wavelengths. The N-isomer and P-isomer contributions to the fluorescence signals are separated. The absorption and stimulated emission cross sections of the N- and P-isomers are determined. The results are discussed by application of an angular configuration coordinate system.