highlight 7 2022

Using visible-pump/IR-pump/IR-probe spectroscopy, we are investigating whether IR excitation of an anti-symmetric vibration can induce excited-state symmetry breaking in multibranched donor-acceptor molecules. The figure on the left depicts the recovery dynamics of the S1(v=0) state of a D-A-D molecule after IR excitation to the v=1 state of the anti-symmetric -C≡C- stretching mode. These dynamics, which include intra- and intermolecular vibrational relaxation, accelerates significantly upon increasing solvent polarity. This effect could arise from the solvent dependence of the electronic structure of the molecule in the S1 state. Further investigations are in progress.

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Eric Vauthey

Physical Chemistry Department - Sciences II - University of Geneva
30, Quai Ernest Ansermet - CH-1211 Geneva 4 (Switzerland)


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