ARGON ISOTOPE EFFECT IN THE MICROWAVE SPECTRA OF ArDF

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1985

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Ohio State University

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The measurement of rotational $transitions^{1}$ in ArHF, involving the less common argon isotopes in natural abundances, has been made possible by modifying the pulsed Fourier-transform Fabry-Perot microwave spectrometer developed by W. H. Flygare and co-$workers.^{2}$ We have extended these studies to ArDF by measuring the K = 0 J = 1 $\rightarrow$ 2 transitions in $^{36}$ArDF and $^{38}$ArDF at 12,610 and 12,373 MHz, respectively. The analysis of the rare gas HF binary complexes has traditionally utilized the centrifugal distortion constant, $D_{J}$, in determining the equilibrium geometry and well depth. The argon isotopic data permit the determination of the vibration-rotation interaction constant, $a_{e}$ (approximately 1000 times larger than $D_{J}$) which can be used to improve the determination of the radial potential. The analysis of the ArDF potential will be discussed with respect to the previous ArHF results.

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$^{1}$B.L. Cousins, S.C. O'Brien and J.M. Lisy, J. Phys. Chem. 88, 5142 (1984). $^{2}$E.J. Campbell, W. C. Read and J.A. Shea, Chem. Phys. Lett. 94, 69 (1983).
Author Institution: Department of Chemistry, University of Illinois; Department of Chemistry, University of Illinois

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