Abstract

During the past years high-resolution spectroscopy has been extensively used to study the atomic structure of the rare-earth elements. But up to now, studies have been limited to low-lying levels. Data for hyperfine structure (hfs) and isotope shifts of high-lying levels have rarely been reported. In this paper we discuss application of resonantly enhanced Doppler-free two-photon spectroscopy for the first time, to our knowledge, to study high-lying levels of atomic La, Sm, and Gd.

© 1993 Optical Society of America