Microwave spectrum of methylene fluoride-d2, CD2F2 in the excited vibrational states |
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Authors: | Eizi Hirota Miyoko Sahara |
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Institution: | Department of Chemistry, Faculty of Science, Kyushu University, Fukuoka, Japan |
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Abstract: | The rotational spectra of 12CD2F2 in the ν2, ν3, ν4, 2ν4, ν5, ν7, ν8, and ν9 states were observed and assigned. Weak Coriolis interactions between ν3 and ν7, ν3 and ν9, and ν5 and ν7 were analyzed using approximate expressions for the rotational energy levels. The resonance between the ν2 and the ν8 state was found much stronger, and an effective two-dimensional Hamiltonian with the Coriolis term in the off-diagonal block was set up to analyze the spectra. The effect of the Fermi resonance between ν3 and 2ν4 was found to be very small.The ground-state spectrum of 13CD2F2 was observed and the rotational constants and the centrifugal distortion constants were determined. The data on 12CD2F2 and 12CDHF2 were also improved very much in accuracy.The Coriolis coupling constants and the differences between two vibrational levels in resonance, which were determined by the analysis of the satellite spectra, are in good agreement with those obtained from vibrational spectra, except for the ν2 band center, which is revised to 1170.3 cm?1. The force constants were also checked using the centrifugal distortion constants of 12CD2F2, 13CD2F2, and 12CHDF2. |
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