ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
A systematic investigation of the rotational- and vibrational-state dependence of the HF-Rg (Rg = He, Ar, Kr, Xe) intermolecular interactions has been performed using the technique of light-induced drift. Data are presented of the relative change in collision rate upon excitation Δν/ν≡(νe−νg)/νe of HF with respect to Rg. We studied the P- and R-branch of the fundamental vibrational band (v=0→1) with the rotational quantum number J ranging from J=0 through 6 using a continuously tunable F-Center Laser (λ≈2.5 μm). The results indicate that v and J have independent additive influences upon the collision rate ν. This allows one to determine the v- and J-dependence of ν separately. It is found that, upon vibrational excitation v = 0 → 1, ν increases by ≈0.15% for HF-He; ≈1.0% for HF-Ar, Kr and ≈1.5% for HF-Xe. A remarkable J-dependence of ν is observed: for HF-Ar, Kr and Xe, the collision rate ν first decreases by ≈5% for J=0→1, subsequently reaches a minimum for J=2 and then increases again for higher J. By contrast, for HF-He, ν decreases monotonically for J=0 through 5 by ≈ 4%. The influence of the optically induced alignment of J is found to produce a minor contribution only. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.472490
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