Temperature dependence of vibrational energy transfer from DF (v = 1) to several diatomics

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Abstract
The V‐V energy transfer rates from DF (v=1) to HCl, HBr, DBr, D2, N2, O2, CO, and NO have been measured at temperatures from 295 to ∼ 800°K. The measurements were made behind reflected shock waves with the laser‐induced fluorescence technique. The rates for V‐V transfer to the infrared‐active molecules show an inverse temperature dependence near room temperature, characteristic of collisions dominated by attractive potentials. The rates for V‐V transfer to the homonuclear diatomics have positive temperature dependences, typical of short‐range repulsive potential interactions. Several rates of V‐R, T deactivation by DF were also obtained. The available data for the hydrogen halides show that PHY‐HX > PHX‐HY when PHX‐HX > PHY‐HY. HF and DF are equally efficient in deactivating HCl (v=1) and HBr (v=1).