In general, these statements can be found by inspection by considering that the symmetry of the integrand in the transition integral is the direct product of the symmetries of the transition moment operator, and the conjugate-initial and final wave functions, as that symmetry dictates when that integral is zero.
In general, these statements can be found by inspection by considering that the symmetry of the integrand in the transition integral is the direct product of the symmetries of the transition moment operator, and the conjugate-initial and final wave functions, as that symmetry dictates when that integral is zero. For hydrogen-like atoms one of these exists for all multipoles against the case in which the initial and final states have zero total angular momentum; consequently, transitions between such states do not occur. Transitions subject to one of these are known as allowed or forbidden. For 10 points, name these quantum mechanical strictures that dictate when a transition is possible.
In general, these statements can be found by inspection by considering that the symmetry of the integrand in the transition integral is the direct product of the symmetries of the transition moment operator, and the conjugate-initial and final wave functions, as that symmetry dictates when that integral is zero.
{selection rules} [prompt on {transition rules}]