Quenching of infrared chemiluminescence. Part 6.—Rates of energy transfer from HF (2 ⩽v⩽ 7) to HF (v= 0), H2, D2 and HD, and from DF (3 ⩽v⩽ 5) to HF (v= 0)

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 the deuterium analogues) has been studied as a function of the concentration of added quenching gases. Using a steady-state analysis, rate coefficients have been determined for the transfer of energy from HF (2 ⩽v⩽ 7) to HF (v= 0), H₂, D₂ and HD, and from DF (3 ⩽v⩽ 5) to HF (v= 0). The results are discussed in relation to (a) the competing processes of vibrational-to-vibrational (V-V) energy exchange and vibrational-to-translational, rotational (V-T, R) energy transfer, and (b) theoretical models.