Three-level atomic systems as models for the dynamical Stark effect in the sodium D₂line

Following Schuda et al. (1974) the effect of the adjacent F=2 to F=2 transition on the fluorescence spectrum of the F=2 to F=3 transition in the sodium D2 line is studied. The spectrum is essentially three-peaked. A small asymmetry is predicted; but inclusion of such a lower level is found to enhance the low-frequency side of the spectrum rather than the high-frequency side as was observed experimentally.