Infrared intensities and Coriolis interactions in methylene fluoride

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Abstract
The individual intensities of the Coriolis interacting ν9, ν3, and ν7 bands of CH2F2 molecule were separately obtained through computer simulation technique. A similar analysis was carried out for the ν8 and ν2 diad, and ν9, ν3, and ν7 triad of CD2F2. The intensities of ν1 and ν6 bands of both CH2F2 and CD2F2 molecules were also reexamined. The obtained results were utilized to determine the sign of the dipole moment derivatives with respect to the normal coordinates. An evidence of a failure of the ’’CH stretching criterion’’ was found in the case of the antisymmetric CH stretching vibration of this molecule.

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