Bulletin of the American Physical Society
55th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Monday–Friday, June 3–7, 2024; Fort Worth, Texas
Session 4A: V: On-Demand Poster Session - Available throughout DAMOP Meeting
8:00 AM,
Monday, June 3, 2024
Abstract: 4A.00007 : Plasma Broadening of Autoionizing Resonances
Presenter:
Anil K Pradhan
(Ohio State Univ - Columbus)
Author:
Anil K Pradhan
(Ohio State Univ - Columbus)
autoionizing (AI) resonances in photoionization and electron-ion scattering cross sections. In particular, R-matrix data for iron ions described in a paper in the RMOP series (RMOP-II, hereafter RMOP2) are used to demonstrate underlying physical mechanisms due to electron collisions, ion microfields (Stark),
thermal Doppler effects, core excitations, and free-free transitions. Breit-Pauli R-matrix (BPRM) cross section for the large number of bound levels of Fe ions are
considered, 454 levels of Fe~XVII, 1,184 levels of Fe~XVIII and 508 levels of Fe~XIX. Following a description of theoretical and computational methods, a sample of results is presented to show significant broadening and shifting of AI resonances due to extrinsic plasma broadening as a function of temperature and density.
Redistribution of AI resonance strengths broadly preserves their integrated strengths as well as the naturally intrinsic asymmetric shapes of resonance complexes which are broadened, smeared and flattened, eventually dissolving into the bound-free continua. The impact on plasma opacities is discussed.
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