Abstract
The anharmonicity in the bending mode of a symmetric bent triatomic molecule is modeled by a simple double-minimum potential and, by assuming a dependence of the force constants of this potential on the symmetric stretching co-ordinate, a model is developed for the anharmonic bend-stretch interaction force constants. In this way the 19-parameter quartic force field of the bent XY 2 molecule may be represented by a 9-parameter model. The parameters in the proposed potential function have been adjusted to the experimental spectroscopic data for SO 2 and NO 2.
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