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Elsaesser, T.; Pfeiffer, M.; Lenz, K.; Lau, A.; Chudoba, C.; Lutgen, S.; Jentzsch, T.; Riedle, Eberhard ORCID: 0000-0002-2672-5718; Woerner, M. (1996): Ultrafast Intramolecular Proton Transfer in the Condensed Phase Studied by Resonance Raman and Femtosecond Spectroscopy. Ultrafast Processes in Spectroscopy, October 30 -November 3, 1995, Trieste (Italy).
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Intramolecular proton transfer after electronic excitation of aromatic molecules proceeds frequently on ultrafast time scales. Femtosecond studies of the transient electronic spectra occurring with and after the formation of a new molecular geometry provide insight into the reaction dynamics, whereas resonance Raman experiments give information on the vibrational modes involved in the initial phase of excited state reactions and — thus — on the microscopic mechanisms of the structural changes. In this paper, we report new results on proton transfer reactions and nonequilibrium vibrational excitations of 2-(2’-hydroxy-5’- methylphenyl)benzotriazole (trade name: TINUVIN P, TIN), an ultraviolet stabilizer of polymers.