Abstract
Vibrational modes are excited by ultrashort tunable IR pulses and the time dependence of the excitation is measured by a second (visible) pulse. Spectra taken at a time delay of several picoseconds give evidence for the population lifetimes of CH-stretching modes of aromatic hydrogen, CH 2 and CH 3 vibrations. Relaxation times between 6 and 8 ps were found. Results are presented for two coumarins in different solvents.
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