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

摘要

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. Vibrationhyphen;tohyphen;vibration energy transfer is apparently the dominant relaxation path except for H2where the higher levels of HF(vge;4) relax by vibrationhyphen;tohyphen;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.