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Chudoba, C.; Lutgen, S.; Jentzsch, T.; Riedle, Eberhard ORCID: 0000-0002-2672-5718; Woerner, M.; Elsaesser, T. (June 1995): Femtosecond Studies of Vibrationally Hot Molecules Produced by Intramolecular Proton-Transfer in the Excited-State. In: Chemical Physics Letters, Vol. 240, No. 1-3: pp. 35-41
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The keto-type reaction product of intramolecular proton transfer in the excited state of 2-(2'-hydroxy-5'methylphenyl)benzotriazole is investigated by femtosecond experiments in a wide spectral range. Keto-type molecules produced on a 100 fs time scale show an emission band between 600 and 800 nm that decays with a time constant of 150 fs. The strong spectral overlap of the emission with the absorption spectrum of the keto-type ground state extending from 400 to 700 nm gives evidence of non-equilibrium vibrational excitations of the product molecules. The keto-type species decays by proton back-transfer to the enol ground state with a time constant of 600 fs. Measurements with different excitation wavelengths demonstrate that the rates of this ultrafast reaction cycle are not affected by the initial amount of vibronic excess energy.