Word Count : 279

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In atomic and molecular spectroscopy, the statement that the first and second overtones have frequencies exactly double and triple of the fundamental vibration frequency applies ideally only to a perfectly harmonic oscillator. In the harmonic approximation, the vibrational energy levels of a diatomic molecule are equally spaced, with the energy difference between successive levels given ___ _____ _________ _____ ________ ____ ____ ___ _________.
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