highlight 10 2020

Excited-state symmetry breaking is often monitored by time-resolved infrared spectroscopy (TRIR). The frequencies and relative intensities of the normal modes contain spatial information on the charge localization. Therefore, the assignment of the transient IR bands is highly desired, but it can be challenging when several vibrational modes absorb in the same spectral region.

The above figure shows the TRIR spectra (left) and the results of the TRIR anisotropy measurements (right) of a centrosymmetric dicyanoanthracene derivative equipped with -C≡C- and -C≡N groups. The anisotropies were calculated after spectral decomposition and helped us with the assignment of the normal modes providing a more detailed picture on the changes of the electronic structure.

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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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