Molecular vibrational dynamics in ethanol studied by femtosecond CARS

Femtosecond time-resolved coherent anti-Stokes Raman spectroscopy (CARS) is utilized to study the ultrafast vibrational dynamics in ethanol at room temperature. The beat wavenumbers between Raman modes of CH stretch modes (from 2800 cm−1 to 3000 cm−1) in ethanol are excited and detected by varying wavelengths of the laser pulses and detection window. The coherence relaxation times of the CH stretch mode in ethanol are measured.