Abstract
EXPERIMENTS on various line series in helium1,2 show that Hughes and Eckart's treatment3 of the ‘specific’ isotope shift in this case is inadequate. Their wave functions take no account of configuration interaction, to which the specific effect is very sensitive.
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STONE, A. Isotope Shifts in the Spectrum of Helium. Nature 176, 130 (1955). https://doi.org/10.1038/176130a0
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DOI: https://doi.org/10.1038/176130a0
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