positions in atomic spectra. These effects, which occur when the excited-state splittings are
of order of the natural line widths, represent an overlooked but significant systematic effect.
We show that excited-state interference gives rise to non-Lorentzian line shapes that
depend on excitation polarization, and we present expressions for the corrected line shapes.
We present spectra of 6, 7 Li D lines taken at multiple excitation laser polarizations and …