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Model potential calculations for the 4s to 9p Rydberg states of the NaNe molecule are presented. Four groups of sigma quantum defects are found. At 6.5 au, there exists, for all values of n, a pseudocrossing between the sigma (n+1)p and sigma nl, l>or=2 curves. This crossing can be predicted by the Fermi model of a free-electron-rare-gas interaction, provided one incorporates the Coulomb acceleration of the electron by the Na + field.
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Dolan et al. (1981) studied this question.
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