Quenching of infrared chemiluminescence. Part 7.—Rates of energy transfer from HF (2 ⩽v⩽ 7) and DF (3 ⩽v⩽ 5) to a wide range of collision partners

Abstract

The intensity of HF (and DF) overtone emission from individual vibrational levels populated in the reactions: H + F₂→ HF + F (1), F + H₂→ HF + H(2)(and their deuterium analogues) has been studied as a function of the concentration of added quenching gases. Rate coefficients have been obtained for the transfer of energy from HF (2 ⩽v⩽ 7) to Q = CO, N₂, O₂, CO₂, N₂O, HCN, H₂O, D₂O, NH₃, CH₄ and SF₆, and from DF (3 ⩽v⩽ 5) to Q = CO, N₂, CO₂, HCN and D₂O. The results are discussed in relation to the influence of the rates of vibrational-to-vibrational (V-V) energy exchange of (a)Δν, the energy discrepancy between the vibrational transition energies, and (b) the infrared activity of the acceptor mode in Q. The role played by strong attractive forces in facilitating energy transfer is also considered.