Physical Chemistry II
Anharmonicity refers to the deviation of a system's vibrational frequency from that predicted by the harmonic oscillator model, where the restoring force is directly proportional to displacement. In simple terms, it indicates that the energy levels of a vibrational mode do not follow a linear pattern and can become uneven as vibrational quantum states increase. This is particularly relevant in molecular systems where anharmonic effects affect the behavior of molecules beyond their simple harmonic oscillation description.
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