Valence and Central Forces in Bent Symmetrical XY2 Molecules

Appropriate generalized coordinates and potential functions are set up for studying the zero- and first-order vibration problem of the best symmetrical XY2 molecular model under the assumption of valence and central forces. The force constants in the quadratic and cubic parts of the potential function of the water vapor molecule are evaluated for these two types of forces by using the data of Darling and Dennison.