We report a direct observation of the D line doublet of sodium-like ions with Z≥72. Spectra in the 1 nm to 9 nm spectral range are presented showing the widely split doublet for Hf61+, Ta62+, W63+,and Au68+. The ions were produced and confined in an electron beam ion trap and observed with a flat-field grazing incidence spectrometer. The measured wavelengths agree well with predictions that take into account the effects of relativistic correlation and quantum electrodynamics. We also report the measured wavelengths for several transitions in Si-like, Al-like, and Mg-like ions.
Citation: Physical Review A (Atomic, Molecular and Optical Physics)
Pub Type: Journals
Atomic Spectroscopy, Na-like Fine Structure, Extreme Ultraviolet, X-ray, highly charged ions, Na-like, electron beam ion trap, EBIT, atomic structure calculation, Tungsten, Hafnium, Tantalum, Gold