Abstract

The single-color multiphoton-ionization spectrum of atomic uranium is recorded in the spectral range 615 to 670 nm by using a Nd:YAG-laser-pumped pulsed dye laser. Most of the 176 observed resonances are assigned to resonant-ionization processes involving three photons, but some resonances are suggested to involve four-photon processes. Plausible ionization pathways are suggested for many of the observed resonances, and some new odd levels of uranium are proposed.

© 1992 Optical Society of America

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