Infrared fluorescence from CO2 laser-pumped CF2HCl: collision dynamics of intermode energy flow

Abstract

Infrared fluorescence (IRF) has been observed from 2ν₃, 2ν₂ and ν₁ modes of CF₂HCl following CO₂laser excitation. The IRF signal was studied as a function of parent and buffer gas pressure. From the kinetic analysis, the decay rate constant for the 2ν₃ mode was calculated to be (4.2 ± 1.0)× 10⁴s^–1 Torr^–1[1 Torr =(101 325/760) Pa], which is assigned to the outflow of vibrationally excited population from the ν₃ mode. The rise and decay rate constants for the v₁ mode were estimated to be (1.2 ± 0.3)× 10⁵ and (3.9 ± 0.9)× 10⁴s^–1 Torr^–1, respectively. The ν₁ decay rate constant was assigned to the intermode vibrational–vibrational (V–V) relaxation process from the ν₁ mode.