SAMOP 2023 – wissenschaftliches Programm

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SYHC: Symposium Precision Physics with Highly Charged Ions

SYHC 2: Intersection of the Electron-Shell and Nuclear Degrees of Freedom

SYHC 2.2: Hauptvortrag

Montag, 6. März 2023, 17:30–18:00, E415

Towards extreme-ultraviolet optical clocks — •José R. Crespo López-Urrutia — Max-Planck-Institut für Kernphysik

Frequency metrology with optical clocks has become a key tool for novel fundamental physics studies using atomic systems. Its outstanding resolution, reproducibility and accuracy makes it in principle capable of sensing effects of all Standard Model interactions on the frequency of electronic transitions, such as, e. g., a variation of the fine-structure constant. Disentangling the different sources of the underlying modifications of the electronic wave function is thereby crucial. For this, it is necessary to change the neutron number as well as the overlap of the electronic wave function with that of the nucleus in a well-defined way, as in the generalized King-plot method [1]. Isoelectronic and isonuclear sequences of highly charged ions (HCI) offer a plethora of possibilities in this regard [2], since they possess many different types of exceptionally long-lived metastable states up to x-ray energies. The development of an optical clock based on HCI [3] show the promise from an extension of frequency metrology beyond the optical range. For this purpose, we are preparing an experiment combining an extreme-ultraviolet frequency comb based on high-harmonic-generation [4] with a superconducting radio-frequency trap [5].

[1] Berengut, J. C., et al., Rev. Res. 2, 043444 (2020)

[2] Kozlov, M. G., et al., Rev. Mod. Phys. 90, 045005 (2018)

[3] King, S.A., et al., Nature 611, 43 (2022)

[4] Nauta, J., et al., Opt. Express 29, 2624 (2021)

[5] Stark J., et al., Rev. Sci. Instrum. 92, 083203 (2021)