Abstract

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 ƒ<sup>n</sup>6<i>s</i>7<i>s</i>-ƒ<sup><i>n</i></sup>6<i>s</i>6<i>p</i> transitions show an average isotope shift of +28 mK, ƒ<sup><i>n</i>-1</sup>5<i>d</i>6<i>s</i>6<i>p</i>-ƒ<sup>n-1</sup>5d6s<sup>2</sup> exhibit shifts of -86 mK, ƒ<sup>n</sup>5d6s–ƒ<sup>n-1</sup>5<i>d</i>6<i>s</i><sup>2</sup> lines have shifts of - 105mK, ƒ<sup>n-1</sup>5<i>d</i><sup>2</sup>6<i>s</i>-ƒ<sup><i>n</i></sup>6<i>s</i><sup>2</sup> show shifts of -20 mk, while ƒ<sup>2</sup>6<i>s</i>6<i>d</i>-ƒ<sup><i>n</i></sup>6<i>s</i>6<i>p</i> and ƒ<sup>n-1</sup>6<i>p</i>6<i>s</i><sup>2</sup>-ƒ<sup>n-1</sup>5<i>d</i>6<i>s</i><sup>2</sup> transitions exhibit no detectable shifts. Using these isotope shift trends, 17 levels of YbI have been identified as belonging to 4ƒ<sup>13</sup>5d6s6p configurations.

© 1976 Optical Society of America

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