Isotope shifts in ${}^{20,22}$Ne -- Precision measurements and global analysis in the framework of intermediate coupling

Abstract

We report new precision measurements of the ${}^{20}$Ne--${}^{22}$Ne isotope shift for several transitions, as well as state-of-the-art, \textit{ab initio} field-shift calculations. Our results are combined with historical measurements in a global fit to obtain the isotope shifts of all fifty low-lying neon levels with high precision. These level shifts show a wealth of electronic, nuclear, and relativistic phenomena. Relying on the analogy between mass shift and fine-structure operators, we explain this plethora of neon level-shifts utilizing a small number of effective parameters in a global parametric investigation. This investigation provides a birds-eye view on the isotope shift phenomena in noble gasses. From this vantage point, we reinterpret every effort made to calculate neon mass-shifts \textit{ab initio}, and show that a remarkable agreement between experiment and theory is obtained.

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• A decay microscope for trapped neon isotopes
• Imaging recoil ions from optical collisions between ultracold, metastable neon isotopes
• Nd${}^{+}$ isotope shift measurements in a cryogenically-cooled neutral plasma