Measurement of the fine-structure splitting in Co-like Yb, Re, Os, and Ir to study QED and Breit interaction effects

With enhanced relativistic and quantum electrodynamics (QED) effects and reduced electron correlation at high Z, highly charged ions (HCI) offer a great test-bed to benchmark sophisticated atomic theory. Such ions can be reliably created in an electron beam ion trap (EBIT) by tuning the energy of the electron beam. Atomic spectroscopy of the EBIT plasmas can help explore the structure of unique electron configurations in multielectron atomic systems, and to better understand the atomic processes in laboratory and astrophysical plasma.