Atomic isotope shifts in the spectra of dysprosium, erbium, and ytterbium have been measured using enriched samples and a Fabry-Perot interferometer. Results include new data on 5 lines in DyI, on 71 lines in ErI, and for 89 lines in YbI. Correlation of electron configurations indicates that for these elements ƒⁿ6s7s-ƒⁿ6s6p transitions show an average isotope shift of +28 mK, ƒ^n-15d6s6p-ƒ^n-15d6s² exhibit shifts of -86 mK, ƒⁿ5d6s–ƒ^n-15d6s² lines have shifts of - 105mK, ƒ^n-15d²6s-ƒⁿ6s² show shifts of -20 mk, while ƒ²6s6d-ƒⁿ6s6p and ƒ^n-16p6s²-ƒ^n-15d6s² transitions exhibit no detectable shifts. Using these isotope shift trends, 17 levels of YbI have been identified as belonging to 4ƒ¹³5d6s6p configurations.

© 1976 Optical Society of America

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