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Measurements and Rovibrational Study of the CH2FCl ν4Band by Tunable Diode Laser Spectrometer

✍ Scribed by A. Baldacci; P. Stoppa; S. Giorgianni; R. Visinoni

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
250 KB
Volume
177
Category
Article
ISSN
0022-2852

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✦ Synopsis

The gas-phase infrared spectrum of natural CH 2 FCl has been investigated in the n 4 band region around 1070 cm 01 at a resolution of 0.002 cm 01 using a tunable diode laser spectrometer. This fundamental of A symmetry gives rise to an a/b hybrid band where the a-type component dominates. The rovibrational analysis led to the identification of more than 2400 transitions with J £ 55 and K a £ 17 for the main isotopic species. A number of K a subbands were found to be affected by perturbations, through Coriolis or Fermi resonance, with the nearby states n 9 or n 5 / n 6 , respectively. From the interaction effects, the second-order a-axis Coriolis coupling parameter was determined. Using Watson's Areduction Hamiltonian in the I r representation, a set of effective constants for the CH 2 F 35 Cl n 4 band was derived employing transitions free of major resonance contribution. From spectral simulation, it was found that the intensity contributions of the a-and b-type components are about 70 and 30%, respectively.

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