In the parabolic approximation used to solve the vibrational Schrödinger equation for diatomic molecules, the spacing between energy levels is equal to

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In the parabolic approximation, the vibrational energy levels of a diatomic molecule are quantized and equally spaced by an amount equal to hv, where h is Planck's constant and v is the vibrational frequency.

In the Parabolic Approximation Used to Solve the Vibrational Schrödinger