Energy-Transfer Processes in CF₂HCl and CF₂Cl₂ at Higher Pressures

Abstract

The unimolecular decomposition of the halomethanes CF₂HC1 and CF₂C1₂ studied under high IR laser fluence (Φ < 200 J/cm²) and high pressure conditions (p < 2kPa). Under the given conditions considerable contributions of intermolecular energy trans er processes on dissociation behavour were found.

The rotational and vibrational excitation of the CF₂ dissociation fragments, as monitored by laser-induced fluorescence (LIF), was used as a probe for the energy content of the parent molecules. The observed strong post-pulse-dissociation was attributed to intermolecular vibrational energy transfer between undissociated, highly vibrationally excited parent molecules in the region also outside the focus core. This result supports the energy pooling model.