Intramolecular Vibrational Dynamics Of Nu 1 Mode In (Cf3)(2)C=C=O Molecule Induced By Resonant Ir Femtosecond Radiation

Intramolecular dynamics of the vibrational levels (up to v = 5) of the nu(1) mode in (CF3)(2)CCO molecule, induced via multiphoton selective excitation of this mode by resonant femtosecond IR radiation, was studied. The times of intramolecular vibrational energy redistribution (IVR) of each vibrational level v to the remaining modes of the molecule were measured. In accordance with the theory predictions the decrease of IVR time with increasing v is observed. A sharp reduction of the IVR time (up to 1 ps) at a wavelength of 2130 cm(-1) of transition v=3 -> v=4 was found. It was shown that with a negative chirp of a femtosecond radiation pulse the population of high-lying vibrational levels of nu(1) modes significantly increases.