SALSAA: a statistical approach to line shapes from an average atom

Adler, Kelsey L.; Gomez, Thomas A.; Shaffer, Nathaniel R.; Starrett, Charles E.; Hansen, Stephanie B.

doi:10.1088/1361-6587/ae3859

SALSAA: a statistical approach to line shapes from an average atom

Journal Article · Fri Jan 23 00:00:00 EST 2026 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/ae3859· OSTI ID:3022303

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Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States); University of New Mexico, Albuquerque, NM (United States)
University of Colorado, Boulder, CO (United States); University of Texas at Austin, TX (United States); University of Michigan, Ann Arbor, MI (United States)
University of Rochester, NY (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Ion-Stark line broadening is a key density diagnostic for hot dense plasmas relevant to inertial fusion and astrophysics. It is caused by interactions of a radiating ion with nearby perturbing ions, whose electric microfields lead to changes in bound-bound transition energies. Ion-Stark broadening becomes increasingly difficult to compute for complex, many-electron ions with myriad transitions. In this paper, we propose a simplified approach to ion-Stark broadening based on self-consistent ion distributions and electronic structure from an average-atom model. We find that this approach reproduces the line shape predictions of one traditional method for high-n K-shell emission lines in aluminum ions with accuracy sufficient for density diagnostics in thermal plasmas with equal ion and electron temperatures. We expect that this approach can be extended to provide a reasonable picture of ion-Stark broadening in many-electron ions, enabling rapid calculations of line profiles in complex spectra.

View Accepted Manuscript (DOE)

Research Organization:: University of Rochester, NY (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003525; NA0004144

OSTI ID:: 3022303

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 1 Vol. 68; ISSN 0741-3335; ISSN 1361-6587

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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