Abstract
High-resolution atomic-beam laser spectroscopy in Gd I and Er I has been performed in the ultraviolet (UV) region. Isotope shifts have been measured for three UV transitions in Gd I and two transitions in Er I. Hyperfine structure constants of 155,157 Gd and 167 Er have been newly determined for two high-lying levels. Specific mass shifts and field shifts have been derived for the 4 f 7 5 d 6 s 2 –4 f 7 5 d 2 6 p and 4 f 7 5 d 6 s 2 –4 f 8 5 d 6 s transitions in Gd I as well as the 4 f 12 6 s 2 –4 f 11 5 d 6 s 2 and 4 f 12 6 s 2 –4 f 11 5 d 2 6 s transitions in Er I. Results show that the specific mass shift strongly depends on the orbital angular momentum of electrons.
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