THEORY OF ANOMALOUS LINE STREGTHS IN ISOTOPICALLY SUBSTITUTED SPHERICAL TOP $MOLECULES^{*}$
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Date
1980
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Ohio State University
Abstract
Recent measurements $^{1,2}$ of absolute strengths of the $2\nu_{3}$ singlets Q1, RO, and R1 for $^{13}CH_{4}$ and $^{12}CH_{4}$, under identical experimental conditions designed to minimize errors in derived relative strengths, demonstrated that isotopic substitution for the central atom in a spherical top can affect these strengths dramatically. In an effort to explain these apparently anomalous experimental results, vibration-rotation interactions in the multiplets $\{m\nu_{1} + n\nu_{3}\}$ with m + n = 1,2,3,\ldots have been considered. Preliminary theoretical results indicate that the observed isotopic effects, including possible variation with rotational quantum number, can be accounted for satisfactorily.
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$^{*}$Research supported by the National Aeronautics and Space Administration. $^{1}$K. Fox, D.E. Jennings, G. W. Halsey, and S. J. Daunt, Paper TAS, 34th Symposium on Molecular Spectroscopy, The Ohio State University (1979). $^{2}$K. Fox, G. W. Halsey, S. J. Daunt, W.E. Blass, and D. E. Jennings, J. Chem. Phys., to be published 15 April 1980.
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