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• W1965836254 endingPage "1735" @default.
• W1965836254 startingPage "1727" @default.
• W1965836254 abstract "Nonrelativistic variational calculations with the relativistic correction to order ${ensuremath{alpha}}^{2}$ have been carried out to obtain the energy levels for the n $^{1}$,3S, n $^{1}$,3P, and ${n}^{1}$,3D series in He up to n=8. The calculated term values have converged generally to within an uncertainty of ensuremath{sim}${10}^{mathrm{ensuremath{-}}4}$ ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$, a value matching the accuracy of recent high-precision wavelength measurements. The results are combined with theoretical Lamb shifts and systematically compared with currently available high-precision experimental data. The consistency between theory and experiment is good, although for some low-lying (n=3--6) S and P states there exist small discrepancies, presumably caused by the estimated Lamb shifts. The calculated term values for high-lying excited states have better accuracies than existing experimental data. Addition of the theoretical term values to the corresponding experimental excitation energies suggests a value of 198 310.7725(5) ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ for the ground-state ionization energy on the energy scale fixed by the ${2}^{1}$P value of 171 135.0000 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$." @default.
• W1965836254 created "2016-06-24" @default.
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• W1965836254 date "1986-09-01" @default.
• W1965836254 modified "2023-09-25" @default.
• W1965836254 title "Energy levels for<i>S</i>,<i>P</i>, and<i>D</i>states in He through precision variational calculations" @default.
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• W1965836254 doi "https://doi.org/10.1103/physreva.34.1727" @default.
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