Abstract
Time-resolution Raman scattering spectroscopy has been used to study the collisional vibrational relaxation of high-frequency 2ν8, ν1 and ν6 modes in the CH2F2 molecule after their excitation by optical parametric oscillator pulses. The rate constants of energy exchange between these modes and their relaxation to other modes have been determined. The exchange between the stretching CH vibrations ν1 and ν6 have been found to be the fastest. The rate constant of this process has an extremely high value k32(ν6→ν1)=1.51 × 107 s−1 Torr−1 which is higher than the rate of gas-kinetic collisions.
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