This is also called the "Harmonic vibrational and rigid-rotor model."
This selection rule arises from a first-order perturbation theory approximation of the time-dependent Schrödinger equation.
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in wave numbers, cm−1, a unit that is often used for rotational-vibrational spectroscopy.
Helicopter rotor | rotor | tail rotor | Tail rotor | ROTOR | Rotor | Rigid rotor | helicopter rotor |