Vibrational relaxation of hydrogen and deuterium fluorides

The vibrational relaxation of HF and DF has been studied using the laser fluorescence technique at 295°K. Rates were determined for self‐relaxation of HF and DF and also for cross relaxation through transfer of vibrational energy between these molecules. The results are compared with relaxation of the isotopic combinations in HCl/DCl and HBr/DBr, and discussed with reference to the Moore and the Shin theories. Results are also given for the rates of vibrational energy transfer between ${\mathrm{DF–D}}_2$ and ${\mathrm{HF–H}}_2$ and for the relaxation of DF by Ar, He, H₂, and N₂ and for HF by Ar and He.