Calculated pressure broadening and shift for the sodium atom perturbed by rare gases. II. Two-photon3S−nStransitions (n=6−9)

Our recent treatment [Phys. Rev. A 18, 1066 (1978)] of the broadening and shift of alkali-metal-atom two-photon $S-S$ transitions is applied to the Na $3S-\mathrm{nS}$ transitions ($n=6-9\mathrm{}$) perturbed by Ar, Kr, and Xe rare gases. Comparison with recent experimental data [A. Flusberg et al., Phys. Rev. A 19, 1607 (1979)] on the Na-Ar pair for $n\le 7$ shows good agreement. However, for transitions to $n>\mathrm{}8\mathrm{}$ the calculated pressure effects no longer agree well with experimental data; presumably the pressure effects cannot be adequately described by a simple two-body long-range impact theory.