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From the spectroscopic data of non-penetrating Rydberg states of C I, N I, O I and Ne I the authors have extracted the polarisability and the quadrupole moments of the ionic core. The values so obtained from different Rydberg nl levels are mutually consistent to within 1%. Comparison with the values from ab initio calculation shows agreement to a few per cent. Further, some empirical relations between certain Slater integrals are shown to be the direct consequence of our treatment.
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Chang et al. (1982) studied this question.
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