V → T ,R and V→V relaxation in DCl systems

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Abstract
A laser-fluorescence technique was used to measure the V→T,R relaxation of DCl (ν = 1) by DCl, rare gases, and hydrogen isotopes, as well as the V→V relaxation of HCl, DCl, and CO by deuterium halides, first-row diatomics, and some polyatomic molecules. The dependence of V→V probabilities on energy discrepancy qualitatively indicates the role of rotation in removing excess vibrational energy. Significant differences in the interaction potential between HX and various first-row diatomics is also suggested. HCl→ 16O2 and O182 V→ V relaxation was measured and leads to an estimated probability for the multiquantum process, HCl(ν=1)+ 18O2(ν=0)→ HCl(ν=0)+ 18O2 (ν=2)+Δ E=−30 cm−1.

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