What is anharmonicity? Draw a diagram for the variation of potential energy with  intermolecular distance for an anharmonic and harmonic oscillator

Anharmonicity refers to the deviation from perfect harmonic behavior in a molecular system, specifically in the context of vibrational modes. In an ideal harmonic oscillator, the potential energy of the system increases quadratically with the displacement from equilibrium, meaning the force constant remains constant and the oscillation follows a sinusoidal pattern. However, real molecules often experience deviations from this ideal behavior at higher energy levels, resulting in anharmonicity. This occurs because, at higher ____ ___ _________ _________ __________ _________ ______ _______ __________ ____ _______.
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