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Modulations in the time gated ultrafast fluorescence of the protonated Schiff base of retinal in various solvents are reported, which reflect the creation and evolution of vibrational wave packets due to the torsional mode of retinal of frequency ∼120cm −1 . The oscillations are damped in ∼400fs. Their frequency is significantly decreased compared to the case of the protein (170cm −1 ...
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