Force constants and normal vibrational modes of a simplified molecular model of methyl thionitrite

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With a potential function based on the valence force field approximation, Wilson's G- F matrix method was used to determine the force constants of a simplified molecular model of methyl thionitrite (CH 3SNO). The derivation of the model's Lagrangian function in Cartesian coordinates was used as a check of the numerical calculations performed with the aid of the G- F matrix method. The model's normal modes of vibration and their normalized energy distribution among the internal coordinates were calculated. These results led to the reassignment of two fundamental frequencies of methyl thionitrite.