THE TWO LOWEST EXCITED STATES OF $CHF_{2}C \ell$. JOINT INFRARED AND MILLIMETERWAVE STUDY

$CHF_{2}C \ell$ (or CFC-22) is progressively replacing CFC-11 and CFC-12 in most of their uses since it is supposed not to be harmful to the ozone layer. Therefore several european laboratories have undertaken a wide study of the spectroscopic properties of $CHF_{2}C \ell$ (Contract ERBCHRX93-0157 of the European Union). Here we report the results of a joint effort on the two lowest vibrationally excited levels $\nu_{9} = 1$ and $\nu_{6} = 1$ of this molecule. In the infrared, three high-resolution FT spectra of $\nu_{9} (366.1972 cm^{-1}, b-type band)$ and $\nu_{6} (412.9286 cm^{-1}, hybrid a/c band)$ were analyzed, two of them using isotopically pure $CHF_{2}{^{35}} C\ell$. More than 11800 transitions were assigned for these two bands. In the man-wave region (up to 470 GHz), more than 850 transitions belonging to $\nu_{9} = 1$ and $\nu_{6} = 1$ of $CHF_{2}C\ell$ were assigned. Using a least squares program provided by $H.M. Pickett^{1}$, these data have been fitted first separately and later simultaneously. The model included both a c-type and a (weaker) a-type Coriolis resonance.

Description

1. H.M. Pickett. J. Mol. Spectrosc 148, 371 (1991)
Author Institution: CNRS associé aux Uniersités P et M. Curie et Paris-Sud., Bât 350, Campus d'Orsay, 91405 Orsay, France; Polish Academy of Sciences, Al. Lolnikówie 32/46, 02668 Warszawa, Poland.; University of Bologna, Via Selmi 2, 40216 Bologna, Italy.; Justus-Liebig Universität Giessen, 35392 Giessen, Germany.; "FB9, Universität Gesamthochschule", 42097 Wuppertal, Germany

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http://hdl.handle.net/1811/29559

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Abstracts of OSU International Symposium on Molecular Spectroscopy 1990-1999

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