Near resonant V–R,T energy transfer in the relaxation of vibrationally excited HF by CO

Rotationally state specific quenching of HF(v) by CO is studied using the fast flowing afterglow technique incorporating FTIR spectroscopic detection of HF(v) products. It is shown that HF(v=3) quenching by CO proceeds predominantly by near energy resonant V–R,T channels and not by a V–V process. The near resonant Δv=1 channel accounts for, at least, 50% of the total quenching of HF(v=3). The total removal rate for HF(v=3) quenching by CO was measured and a rate constant, k3(CO)=(2.77±0.22)×10−12 cm−3 molecule−1 s−1, was determined.

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