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arXiv · 2406.06806

Isotope shift measurement of the 423-nm transition in neutral Ca

David Röser·Lukas Möller·Hans Keßler·Simon Stellmer
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Abstract

We report on saturated absorption spectroscopy measurements of the $(4s^2) ^{1}S_0\rightarrow(4s4p) ^{1}P_1$ transition for the four most abundant even-mass isotopes in calcium. By referencing the laser locked to an ultralow expansion cavity and carefully investigating systematic errors, isotope shifts are determined with a precision below 100 kHz, improving previously reported values by a factor of about five. A King plot analysis employing literature values of the 729-nm transition in Ca ions shows excellent linearity. The field and mass shift parameters are determined from King plots with other transitions.

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David Röser, Lukas Möller, Hans Keßler, Simon Stellmer. 2024-06-10. Isotope shift measurement of the 423-nm transition in neutral Ca. https://arxiv.org/abs/2406.06806

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