Impact of penetrating collisions of plasma ions on spectral line shapes

Gomez, Thomas A.; Stambulchik, Evgeny; White, Jackson R.

doi:10.1103/physreva.109.052804

Impact of penetrating collisions of plasma ions on spectral line shapes

Journal Article · Thu May 02 00:00:00 EDT 2024 · Physical Review A

DOI:https://doi.org/10.1103/physreva.109.052804· OSTI ID:2566218

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University of Colorado, Boulder, CO (United States); University of Texas at Austin, TX (United States); University of Colorado Boulder
Weizmann Institute of Science, Rehovot (Israel)
University of Texas at Austin, TX (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Spectral-line-broadening models have been moving towards including full Coulomb interactions between the atom and plasma, replacing the commonly used dipole approximation. The effects of the full Coulomb interaction have been thoroughly explored for plasma electrons, resulting in redshifts of spectral lines in high-energy-density plasmas. We explore the impact of a full Coulomb treatment on ion broadening. Penetrating collisions due to ions do not significantly impact the linewidths. The most significant aspect is the appearance of quasimolecular resonances in the far line wings, such as those previously observed in white-dwarf spectra. We identify several problems with the existing models. The most direct implementation causes the quasimolecular features to appear at the wrong photon energies. It is possible to include the detailed molecular structure, but this currently requires the Anderson-Talman approximation, which ignores the N-body properties of the plasma. We find that N-body effects can substantially broaden these quasimolecular features and even shift them, depending on the plasma conditions. We conclude that penetration of ions into the spatial extent of the radiator wave function does not strongly affect the usual diagnostics and may have a moderate to weak effect on opacity. Furthermore, the Rosseland mean opacity is weighted towards low-opacity regions of a spectrum, where these quasimolecular features are found.

View Accepted Manuscript (DOE)

Research Organization:: University of Colorado, Boulder, CO (United States)

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

Grant/Contract Number:: NA0003960; NA0004149

OSTI ID:: 2566218

Alternate ID(s):: OSTI ID: 2356969
OSTI ID: 2566267

Journal Information:: Physical Review A, Journal Name: Physical Review A Journal Issue: 5 Vol. 109; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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