Abstract
The 2 ν 6 overtone band (1659.43 cm -1) of cis-CHF CHF has been recorded with an unapodized resolution of 0.004 cm -1, using a multipass cell and a Fourier transform infrared spectrometer. More than 2300 transitions have been assigned and fitted to the Watson’s A-reduced Hamiltonian in the I r representation yielding accurate spectroscopic parameters up to three sextic coefficients. The vibrational resonance of 2 ν 6 with the ν 2 fundamental was also considered and, as a result, the Fermi coupling term, the unperturbed vibrational levels and molecular parameters have been calculated. Additionally, information on the infrared inactive ν 6 vibration have been derived.
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