Q modes (right panels) and corresponding 2D wavelet
power spectra (left panels). The color scale states for the intensity
are in arbitrary units: a) ring deformation modes associated with
a strong −COH phenolic rocking, with an AIMD frequency of 320
cm–1, an exp. value of 321 cm–1, and an exp. rise time of 680 fs; b) COH phenolic rocking combined
with the rocking motion of the nearby ring hydrogen, with an AIMD
frequency of 1156 cm–1 and an exp. value of 1154
cm–1; and c) a skeletal breathing mode, with an
AIMD frequency of 190 cm–1, an exp. value of 191
cm–1, and an exp. decay time of 540 fs.