Studies on hyperfine structure of Sc I and Sc II using Fourier-transform spectroscopy Yixin Xu, Die Fang, Hui Fu, Meina Liu, Huiting Ma, Zhihu Yang, Yang Yang and Zhenwen Dai Eur. Phys. J. D, 75 11 (2021) 284 Published online: 02 November 2021 DOI: 10.1140/epjd/s10053-021-00288-0