The saturable dye DDI is excited with picosecond ruby laser pulses to the S\ singlet state and the relaxation to the ground state So is determined by measuring the transmission of the exciting pulses through the sample. The relaxation time is found to be r -17 ± 3 ps for DDI dissolved in methanol. Admictures of rhodamine 6G, potassium iodide, or tetrabutylammonium iodide do not change the decay time.
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