Vibrational relaxation in the HF–HCl,HF–HBr,HF–HI, and HF–DF systems

Abstract

The laser‐excited fluorescence method has been employed to determine rate constants for vibrational energy transfer $\mathrm{(V\; \to \; V,}\mathrm{R})$ and deactivation $\mathrm{(V\; \to \; R,\; T)}$ processes in the $\mathrm{HF–HCl,HF–HBr,HF‐HI}$ , and $\mathrm{HF–DF}$ systems at temperatures of 300 and 350°K. The rates exhibit a marked inverse temperature dependence indicative of strong attractive (hydrogen‐bonding) intermolecular forces. Energy transfer from HF to HI appears to occur by a double vibrational quantum transition in HI.