Constraints on allowed electromagnetic transitions from symmetry of the transition matrix element: Δℓ = ±1 (electric dipole), Δm = 0, ±1, ΔS = 0 (LS coupling), etc.
Constraints on allowed electromagnetic transitions from symmetry of the transition matrix element: Δℓ = ±1 (electric dipole), Δm = 0, ±1, ΔS = 0 (LS coupling), etc.