The technique of laser-induced fluorescence (LIF) spectroscopy in supersonic free jets was applied to diphenylbenzobis(thiadiazole) [Angew. Chem., Int. Ed. Engl. 33 (1994) 1977], in the excitation wavelength region of 500-595 nm. The position of the electronic origin was determined to be 589.81 ± 0.02 nm. The LIF excitation spectra indicate that the phenyl groups swing torsionally with large amplitude in the electronically excited state. The fluorescence lifetimes were measured at 11 major...[Show more]
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