Laporte selection rule

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A selection rule in atomic spectra stating that spectral lines associated with electric-dipole radiation must arise from transitions between states of opposite parity. The Laporte selection rule was discovered by O. Laporte in 1924 and was explained by the application of group theory to the quantum mechanics of atoms. In the case of magnetic-dipole and quadrupole radiation the selection rule for spectral lines is the opposite of the Laporte rule, i.e. transitions are only allowed between states of the same parity in these cases.

Subjects: Chemistry.

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