Collinear Laser Spectroscopy of the $1s2s\,^3\!S_1\rightarrow 1s2p\,^3\!P_{0,2}$ Transitions in Helium-like $^{11}$B$^{3+}$

Axel Buß; Konstantin Mohr; Volker Hannen; Zoran Andelkovic; Max Horst; Phillip Imgram; Kristian König; Bernhard Maass; W. Nörtershäuser; Simon Rausch; Rodolfo Sánchez; Christian Weinheimer

arXiv · 2609.33056

Collinear Laser Spectroscopy of the $1s2s\,^3\!S_1\rightarrow 1s2p\,^3\!P_{0,2}$ Transitions in Helium-like $^{11}$B$^{3+}$

Axel Buß·Konstantin Mohr·Volker Hannen·Zoran Andelkovic·Max Horst·Phillip Imgram·Kristian König·Bernhard Maass·W. Nörtershäuser·Simon Rausch·Rodolfo Sánchez·Christian Weinheimer

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Abstract

We report on hyperfine structure measurements of the $1s2s\,{}^{3\!}S_1 \rightarrow 1s2p\,{}^{3\!}P_{0,2}$ fine-structure transitions in the spectrum of $^{11}$B$^{3+}$ ions. The helium-like ions were created in an electron beam ion trap (EBIT) and ejected after a short production period of 15 ms. A challenge of the experiment was the treatment of the complex energy-time-profile of the created ion bunches and the sensitivity of the collinear laser spectroscopy to the starting potential inside the EBIT. Despite these complications and the low statistics of the experiment, we were able to confirm and improve the results of a previous measurement of these transitions. While we find moderate tension in the results for the hyperfine parameters of the $^{3\!}P_{0,2}$ levels, their fine-structure level energies are in reasonable agreement between experiments and with theory.

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Axel Buß, Konstantin Mohr, Volker Hannen, Zoran Andelkovic, Max Horst, Phillip Imgram, Kristian König, Bernhard Maass, W. Nörtershäuser, Simon Rausch, Rodolfo Sánchez, Christian Weinheimer. 2026-09-27. Collinear Laser Spectroscopy of the $1s2s\,^3\!S_1\rightarrow 1s2p\,^3\!P_{0,2}$ Transitions in Helium-like $^{11}$B$^{3+}$. https://arxiv.org/abs/2609.33056

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