Abstract
The technique of employing resonantly enhanced Doppler-free two-photon spectroscopy has been applied to the study of Gd i for the first time to our knowledge. The high-lying odd-parity levels investigated range from 34 698 to 41 213 cm−1. By analysis of the recorded fluorescence spectra, the hyperfine-structure constants of four levels and isotope shifts of seven two-photon transition lines are obtained.
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