Abstract
The infrared spectrum of natural CF 2Cl 2 has been investigated in the ν 1 band region at a resolution of ∼0.002 cm −1 using a tunable diode laser spectrometer. The measurements have been carried out at low temperature (∼200 K) in order to deplete the “hot band” contributions; nevertheless, the spectra still exhibit an extremely high density of lines due to the presence of different chlorine isotopic features. Many P- and R-branch transitions of the CF 2 35Cl 2 ν 1 band covering J and K a values up to 45 and 9, respectively, have been identified. The band was found to be perturbed by Coriolis-type resonance and at least two nearby states, ν 8 and ν 2 + ν 7, seem to be involved in the interaction. From the assigned transitions a set of effective constants for the ν 1 fundamental of CF 2 35Cl 2 has been derived.
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