The spectra of singly ionized lanthanum have been measured by means of collinear fast ion-beam-laser spectroscopy (CFIBLS). The hyperfine structures (HFSs) in the 570.33 nm, 587.40 nm and 612.96 nm lines of LaII were resolved and the HFS constants A and B of the involved levels are given.
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Li et al. (2001) studied this question.