Deactivation of laser excited CH3F in CH3F–X mixtures

Abstract

The vibrational relaxation of CH₃F in mixtures of rare gases, O₂, N₂, H₂, and D₂ has been studied by means of laser induced fluorescence. The data can be interpreted qualitatively in terms of a combination of $\mathrm{V\; \to \; T/R}$ energy transfer processes from both the ν₃ and ${\nu }_6\text{\hspace{0.17em}v=1}$ states of CH₃F. $\mathrm{V\; \to \; R}$ processes seem to be dominant for heavy collision partners while $\mathrm{V\; \to \; T}$ processes appear to dominate for light collision partners. The quantitative agreement between theory and experiment is also considered.