The isotope shift in Li i has been studied in the hollow cathode spectrum from separated isotopes with the aid of a Fabry-Perot interferometer. Specific shifts have been determined for the $2s$, $2p$, $3s$, $3p$, $3d$, $4s$, $4d$, $5s$, and $5d$ levels. The inadequacy of the Hughes-Eckart approximation is pointed out.
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R. H. Hughes (1955) studied this question.
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