Improvedi41snlionization energy, energy levels, and Lamb shifts for1snsand1snpterms

The consistencies of calculated term values (ionization energies) for various 1snl terms having n=5–8, l=1–5 are tested by microwave-spectroscopic and other available data. The most accurate n P, n D, and n F term values obtained from published variational calculations are generally found to be consistent, within the estimated uncertainties, with more accurate n G and n H energies from core-polarization theory [R. J. Drachman, Phys. Rev. A 26, 1228 (1982)]. The n ${\mathrm{}}^3$D and n ${\mathrm{}}^1$D term values from variational calculations [A. Kono and S. Hattori, Phys. Rev. A 34, 1727 (1986)] are confirmed within uncertainties as small as ${10}^{\mathrm{-}4}$ ${\mathrm{cm}}^{\mathrm{-}1}$ (n=8), although the ${}_{}{}^1{}_{}{}^{}\mathrm{D}$ values are systematically too large by amounts within the uncertainties. The ionization energy $E_I$ has accordingly been reevaluated by using only the calculated n ${\mathrm{}}^3$D term values (n=4,5) and available experimental measurements: The resulting $E_I$ value is 198 310.772 27(40) ${\mathrm{cm}}^{\mathrm{-}1}$ with respect to the 2 ${}_{}{}^3{}_{}{}^{}S$ level at 159 856.077 60 ${\mathrm{cm}}^{\mathrm{-}1}$.