Resonant coherent excitation of the lithiumlike uranium ion: A scheme for heavy-ion spectroscopy

Abstract

We report our observation of the resonant fluorescence from highly charged uranium ions. Using the resonant coherent excitation (RCE) technique, the $2s$-$2{p}_{3/2}$ transition in 191.68 MeV/u Li-like U${}^{89+}$ ions was excited at 4.5 keV with a resonance width of 4.4 eV. The result demonstrated that the RCE can be applied to resonant fluorescence spectroscopy of high-$Z$ ions up to uranium with high efficiency and resolution.