122 / 2025-03-15 12:02:45

Observation of QED Effects and Configuration Interaction in Highly Charged Au Ions Produced by High Power Laser

QED effects,,Configuration Interaction,high power lasers

We report on measurements of extreme ultraviolet (EUV) radiation from highly-charged gold ions in laser-produced plasma to test the bound-state quantum electrodynamics (QED) effects and electron configuration interactions (CI), that are supposed to play an important role determining the energy levels of high-Z highly-charged ions. The emission lines from 4s 2S1/2-4p 2P1/2 and 4d 2D3/2-4f 2F5/2 transitions of Cu-like Au ions (Au50+), whose ground state has a full M shell and one 4s electron in the outermost shell, are analyzed. For comparison, we present the theoretical calculations using multiconfiguration Dirac-Hartree-Fock (MCDHF) method together with some published data based on different approaches. Good agreement was obtained only when the QED effects and the CI of electrons with principal quantum number up to n=9 were taken into account. Our work quantitatively verified the importance and accuracy of CI corrections in experiments for the first time. And the contribution from QED effects were well demonstrated.