highlight 1 2021

We are investigating excited-state symmetry breaking in polymer films using a centrosymmetric acceptor-donor-acceptor (A-π-D-π-A) conjugate. The above Figures show the triple bonds regions of the time-resolved infrared spectra measured in neat cyclohexane (CHX, dashed green line) and in an apolar film, 20 ps after excitation at various wavelengths.Our results reveal that different subpopulations can be selected in the film samples by varying the excitation energy. When exciting with the lowest energies, the spectra are close to that observed in CHX. Thus, using less energy favours the excitation of the most symmetrical structures, whereas rising the pump energy leads to the excitation of several subpopulations with lower symmetry.

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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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