Vibrational coherence in excited electronic states studied with multidimensional time-resolved spectroscopy

Conference by Prof. Marcus MOTZKUS (University of Heidelberg), Institute of Physical Chemistry, Heidelberg University, D-69120 Heidelberg, Germany

Abstract

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 b-carotene, 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.

 

Contact : Prof. Benoît CHAMPAGNE - +3281724554 - benoit.champagne@unamur.be
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