OBSERVATION OF $ArHF(3001)\leftarrow(0001), (3101)\leftarrow(0001)$ AND $(3111)\leftarrow (0001)$ HOT BAND TRANSITIONS NEAR $11400 cm^{-1}$
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Date
1999
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Ohio State University
Abstract
We present the spectra of three hot band transitions of $ArHF (3001) \leftarrow (0001), (3101) \leftarrow (0001)$ and $(3111) \leftarrow (0001)$ near $11400 cm^{-1}$ obtained by intracavity laser induced fluorescence. The spectroscopic constants of these transitions are determined to be $\nu_{0}=11347.2426(2)cm^{-1}, 11405.5718(6)cm^{-1}, 11417.3888(6)cm^{-1}$ and $B=0.095546(32)cm^{-1}, 0.090617(37)cm^{-1}, 0.090827(15)cm^{-1}$, respectively. Of particular importance is the $(3001) \leftarrow (0001)$ hot band transition, as it precisely determines the vdW stretching frequency of $46.894 cm^{-1}$ for ArHF at $v_{HF}=3$. The vdW stretching frequency increases 21.2\% upon $HF v=3 \leftarrow 0$ valence excitation. The present experimental results are in reasonable agreement with predictions by Hutson's ArHF $H(6,4,2)$ $potential.^{a}$ A high-level 3-dimensional ab initio ArHF potential with H-F distances ranging from $0.7 - 1.9$ {\AA}will be presented. Recent progress in the determination of HF product rotational state distribution of HF-complexes at $v_{HF}=3$ following the vibrational predissociation, using a newly constructed Michelson interferometer in conjunction with intracavity laser fluorescence, will be also presented.
Description
$^{a}$ H.-C. Chang, F.-M. Tao, W. Klemperer, C. Healey, and J.M. Hutson, J. Chem. Phys. 99, 9337 (1993)
Author Institution: Department of Chemistry, Harvard University; Institute of Atomic and Molecular Sciences, Academica Sinica
Author Institution: Department of Chemistry, Harvard University; Institute of Atomic and Molecular Sciences, Academica Sinica