Abstract

The technique of employing resonantly enhanced Doppler-free two-photon excitation from either the ground state or a low-lying metastable state for precisely measuring the hyperfine structure of the atomic high-lying levels has been used, for the first time to our knowledge, to study 139La i. By detecting the laser-induced fluorescence produced in a hollow-cathode discharge tube, one can measure a set of spectra for each two-photon transition line. The spectra are analyzed in detail and fitted to yield hyperfine structure constants. The A values of eight high-lying even-parity levels of 139La i are then determined.

© 1993 Optical Society of America

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