High-Resolution FT-IR Spectra of CHF2Cl in the Region between 335 and 450 cm−1

✍ Scribed by I. Merke; G. Graner; S. Klee; G. Mellau; O. Polanz

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 732 KB
• Volume: 173
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1995.1249

✦ Synopsis

The spectrum of chlorodifluoromethane (CFC-22) has been investigated in the infrared region. Spectra of (\mathrm{CHF}{2} \mathrm{Cl}) were recorded at room temperature with high resolution (\left(0.0017 \mathrm{~cm}^{-1}\right.), Bruker IFS (120 \mathrm{HR}) ) in the region between 335 and (450 \mathrm{~cm}^{-1}). The spectral analysis of (\mathrm{CHF}{2}{ }^{33} \mathrm{Cl}) (iso-

(\left(\nu_{0}=366.1972 \mathrm{~cm}^{-1}\right)) and more than 6100 lines ((J \leqslant 74)) to the (\nu_{6} a / c)-hybrid band (\left(\nu_{0}=412.9286\right.) (\mathrm{cm}^{-1}) ). These two bands interact through both (c)-type and (a)-type Coriolis couplings. The addition of microwave and millimeter-wave data (see accompanying paper by Z. Kisiel, L. Pszczókowski, G. Cazzoli, and G. Cotti, J. Mol. Spectrosc. 173, 477-487, 1995) to these IR transitions allowed a global fit to be performed. The resulting molecular parameters are much better defined than when each type of transition is fitted separately. It was also found, by simulating the spectrum, that the dipole moment ratio between the (a) and (c) components of (\nu_{6}) is about 1.5 and the corresponding ratio of (\nu_{9}) and (\nu_{b a}) is about 2 . Moreover, results will be given concerning (\mathrm{CHF}_{2}{ }^{37} \mathrm{Cl}), obtained from a natural abundance sample as well as approximate bandcenters for several hot bands, which were not analyzed in detail. 1995 Academic Press. Inc.