Speaker
Description
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.
Recently, highly accurate Breit and QED effects have been analyzed for the so-called “Layzer-quenched” systems [1-4]. With minimized electron correlations, these systems are proposed for testing QED predictions [5-6] in high-Z HCI. Particularly interesting examples are the ground state configuration of 2p5 (F-like), 3d9 (Co-like), and 4f13 (Pr-like) ions. To further test the accuracy of atomic calculations for the Co-like case, we have measured the magnetic-dipole 3d9 2D3/2 → 2D5/2 fine-structure transition in Co-like Yb, Re, Os, and Ir using the National Institute of Standards and Technology EBIT facility. It is worth noting that forbidden transitions in Co-like ions may be used for density plasma diagnostics under various conditions. Details of the measurements and their comparison with theoretical results will be presented.
[1] R. Si, X. L. Guo, T. Brage, C. Y. Chen, R. Hutton, and C. F. Fischer, Physical Review A 98,012504 (R) (2018).
[2] M. C. Li, R. Si, T. Brage, R. Hutton, and Y. M. Zou, Physical Review A 98, 020502 (2018).
[3] G. O’Neil et al, Physical Review A 102, 032803 (2020).
[4] M.C. Li, G.L. Zhu, K. Wang, R. Si, C.Y. Chen, T. Brage, R. Hutton, Journal of Quantitative Spectroscopy & Radiative Transfer 287 108215 (2022).
[5] T. A. Welton, Physical Review 74, 1157 (1948).
[6] V. Shabaev, I. Tupitsyn, and V. Yerokhin, Computational Physics Communications 189, 175(2015)
| Presenting Author | Roshani Silwal |
|---|---|
| Presenting Author Email Address | silwalr@appstate.edu |
| Presenting Author Affiliation | Appalachian State University |
| Country | United States |
| Presenting Author Gender | Female |
