Vibrational relaxation of HF(v=1, 2, and 3) in H2, N2, and CO2

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Abstract
The vibrational relaxation times of HF(v=1, 2, and 3) were measured in H2, N2, and CO2 by a laser‐induced fluorescence technique. The upper vibrational levels were produced by sequential absorption in which HF(v=0) was pumped first to HF(v=1) and subsequently to HF(v=2) and HF(v=3) by photons from a pulsed multiline HF chemical laser. At T=295 K, the relaxation rates of HF(v=1), HF(v=2), and HF(v=3) in H2 were found to be, respectively, (1.43±0.15) ×10−2, (1.23±0.1) ×10−2, and (1.13±0.1) ×10−2 (μsec Torr)−1; in N2, (1.45±0.15) ×10−4, (8.1±1.0) ×10−4, and (2.92±0.3) ×10−3 (μsec Torr)−1; and in CO2, 0.039±0.004, 0.19±0.02, and 0.38±0.04 (μsec Torr)−1. Values of (7.5±1) ×10−4 and 0.4±0.04 (μsec Torr)−1 were obtained for the relaxation rates of HF(v=3) in O2 and HCl, respectively.