Laser spectroscopy of ¹⁷⁶Lu⁺

Abstract

We perform high-resolution spectroscopy on ${}^{176}$Lu${}^{+}$ including the ${}^1{S}_0\leftrightarrow {}^3{D}_1$ and ${}^1{S}_0\leftrightarrow {}^3{D}_2$ clock transitions. Hyperfine structures and optical frequencies relative to the ${}^1{S}_0$ ground state of four low-lying excited states are given to a few tens of kHz resolution. This covers the most relevant transitions involved in clock operation with this isotope. Additionally, measurements of the ${}^3{D}_2$ hyperfine structure may provide access to higher order nuclear moments, specifically the magnetic octupole and electric hexadecapole moments.

Keywords:

• Optical atomic clocks
• frequency metrology

Acknowledgements

We thank Rolf Persson for bringing our attention to the possible importance of additional correction terms to the HFS D coefficient.

Notes

No potential conflict of interest was reported by the authors.

Additional information

Funding

This research is supported by the National Research Foundation, Prime Ministers Office, Singapore and the Ministry of Education, Singapore under the Research Centres of Excellence programme. It is also supported by A*STAR SERC 2015 Public Sector Research Funding (PSF) Grant (SERC [project number 1521200080].