Hyperfine structure constants of Lu I and Lu II with Fourier transform spectroscopy Ziqing Yu, Huiting Ma, Ting Wang, Hongfeng Zheng, Rong Wang and Zhenwen Dai Eur. Phys. J. D, 77 5 (2023) 74 Published online: 14 May 2023 DOI: 10.1140/epjd/s10053-023-00656-y