Heidelberg 2015 – scientific programme

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MO: Fachverband Molekülphysik

MO 3: Femtosecond Spectroscopy 1

MO 3.1: Invited Talk

Monday, March 23, 2015, 14:30–15:00, PH/HS1

Vibrational coherence in excited electronic states studied with multidimensional time-resolved spectroscopy — Tiago Buckup and •Marcus Motzkus — Physikalisch-Chemisches Institut, Ruprecht-Karls Universität, D-69120 Heidelberg, Germany

Multidimensional femtosecond time-resolved vibrational coherence spectroscopy allows one to studying the evolution of vibrational coherence in electronic excited states. Methods like pump-DFWM and pump-IVS combines an initial ultrashort laser pulse with a nonlinear probing sequence to re-induce vibrational coherence exclusively in the excited states. By carefully exploiting specific electronic resonances, vibrational coherence from 0 cm-1 over 2000 cm-1 can be detected and its evolution can be mapped. This talk focuses on the observation and mapping of high-frequency vibrational coherence for all-trans biological polyenes like lycopene, retinal and retinal Schiff base. We discuss the role of molecular symmetry in the vibrational coherence activity in the S1 electronic state and the interplay of coupling between electronic states and vibrational coherence.

[1] T. Buckup and M. Motzkus, Annual. Rev. Phys. Chem. 65 (2014) 39.