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The resonant line shape from driving a transition between two states,$|\rm{a}\rangle$ and $|\rm{b}\rangle$, can be distorted due to aquantum-mechanical interference effect involving a resonance between twodifferent states, $|\rm{c}\rangle$ and $|\rm{d}\rangle$, if $|\rm{c}\rangle$has a decay path to $|\rm{a}\rangle$ and $|\rm{d}\rangle$ has a decay path to$|\rm{b}\rangle$. This interference can cause a shift of the measuredresonance, despite the fact that the two resonances do not have a commoninitial or final state. As an example, we demonstrate that such a shift affectsmeasurements of the atomic hydrogen 2S$_{1/2}$-to-2P$_{1/2}$ Lamb-shifttransition due to 3S-to-3P transitions if the 3S$_{1/2}$ state has some initialpopulation.

Interference between two resonant transitions with distinct initial and final states connected by radiative decay