Show that the selection rule for the two-dimensional rotor in the dipole approximation is ml = 1.
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Show that the selection rule for the two-dimensional rotor in the dipole approximation is Δml = ±1. Use A+φ eim1φ and A′ e+φ eim2φ for the initial and final states of the rotor and μ cosφ as the dipole moment element.
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