Abstract
Abstract The force constants in the general quartic valence force field of the cyanogen halides, FCN, ClCN, BrCN and ICN, have been estimated using a simplifying model proposed by Anderson. The parameters of the model were adjusted by least squares to fit the available experimental data from the microwave and infrared spectra and the parameters so obtained were then used to calculate the force constants and, from these, the vibrational energies and rotational constants. The Fermi resonance coupling the states |v1, v2, l2,v3〉 and |v1 −1, v2 + 2, l2, v3〉 was taken into account and the dependence of the Fermi-resonance matrix element on the rotational quantum number, J, was also included in the analysis. We expect the results of these calculations to be useful in the further interpretation of the spectra of these molecules.
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