Measurement of theLMMdielectronic recombination resonances of neonlike gold

Abstract

The LMM dielectronic recombination resonances of a neonlike ion (${\mathrm{Au}}^{69+}$) have been observed. The ions were produced and held in an electron-beam ion trap. The intensity of the n=3→2 x rays resulting from dielectronic recombination was measured as a function of electron-beam energy with sufficient resolution to distinguish the structure of the LMM resonances. The measured resonance strengths for LMM resonances with a 2${\mathit{p}}_{3/2}^{\mathrm{-}1}$ core are in good agreement with theoretical predictions, but there is some disagreement for the 2${\mathit{p}}_{1/2}^{\mathrm{-}1}$ and 2${\mathit{s}}_{1/2}^{\mathrm{-}1}$ core configurations.