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Isotope shifts in levels of the first and second excited configurations of oxygen were calculated using Hartree one-electron wave functions, computed for 1s²2s²2p³3s and 1s²2s²2p³3p. The suitability of the wave functions for this type of calculation can be checked with recent experiments in nine spectral lines of neutral oxygen. The discrepancies between calculated and observed shifts are from -0.09 cm^-1 to +0.09 cm^-1 for the shift between O¹⁸ and O¹⁶. It appears that better one-electron wave functions (e.g., Hartree-Fock functions including exchange) could account for these discrepancies.
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Charles E. Treanor (1954) studied this question.
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