Vibrational relaxation of HF(v=3, 4, and 5) by H2, D2, CH4, CD4, and CO2

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Abstract
Laser excited vibrational overtone fluorescence experiments provide a direct measurement of the collisional relaxation rate constants for HF(v=3, 4, and 5) with the collision partners H2, D2, CH4, CD4, and CO2. Vibration‐to‐vibration energy transfer is apparently the dominant relaxation path except for H2 where the higher levels of HF(v≥4) relax by vibration‐to‐translation, rotation energy transfer processes. Methane and carbon dioxide are the most efficient quenchers of highly vibrationally excited HF and remove a quantum of energy from HF(v=5) on roughly every other collision. Combining these direct excitation measurements with recent chemiluminescence results provides data which span a large range of initially excited vibrational states of HF.

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