Strong-excitation and weak-excitation photodisintegration of DODCI

The disintegration yield of the organic dye DODCI dissolved in ethylene glycol and methanol due to cw excitation to the S-1-state and due to intense picosecond pulse excitation to higher excited singlet states is determined. In the S-1-state DODCI molecules disintegrate after about 5 x 10(4) excitation cycles while rhodamine 6G molecules in ethanol survive about 13 x 10(6) excitation cycles. In higher excited singlet states the DODCI molecules disintegrate on average after about 10 to 30 excitation cycles, while rhodamine 6G gets destroyed after about 140 excitation cycles.