Q modes (right panels)
and corresponding 2D wavelet
power spectra (left panels). The color scale states for the intensity
are in arbitrary units: a) a ring deformation mode combined with hydrogens
out-of-plane motion, with an AIMD frequency at about 930 cm–1, an exp. value of 952 cm–1, an exp. rise time
of 140 fs, and a decay time of 600 fs (from ref (47)) and b) a combination
of ring wagging and breathing mode, with an AIMD frequency of 620
cm–1, an exp. value of 630 cm–1, and an exp. rise time of 300 fs.