4. Bond force constants
A diatomic molecule , whose bond length is re, is not a rigid whole, but is animated by an oscillatory motion around its equilibrium geometry. The potential energy curve of the molecule has a minimum for an interatomic distance r equal to re, which corresponds to a stable equilibrium.
In the vicinity of re, i.e. in the approximation of small displacements, the potential energy can be represented by a parabola of equation :
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Bond force constants
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