Interspecies radiative transition in warm and superdense plasma mixtures

S. X. Hu (), V. V. Karasiev, V. Recoules, P. M. Nilson, N. Brouwer and M. Torrent
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S. X. Hu: Laboratory for Laser Energetics, University of Rochester, 250 East River Road
V. V. Karasiev: Laboratory for Laser Energetics, University of Rochester, 250 East River Road
V. Recoules: CEA, DAM, DIF
P. M. Nilson: Laboratory for Laser Energetics, University of Rochester, 250 East River Road
N. Brouwer: CEA, DAM, DIF
M. Torrent: CEA, DAM, DIF

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Superdense plasmas widely exist in planetary interiors and astrophysical objects such as brown-dwarf cores and white dwarfs. How atoms behave under such extreme-density conditions is not yet well understood, even in single-species plasmas. Here, we apply thermal density functional theory to investigate the radiation spectra of superdense iron–zinc plasma mixtures at mass densities of ρ = 250 to 2000 g cm−3 and temperatures of kT = 50 to 100 eV, accessible by double-shell–target implosions. Our ab initio calculations reveal two extreme atomic-physics phenomena—firstly, an interspecies radiative transition; and, secondly, the breaking down of the dipole-selection rule for radiative transitions in isolated atoms. Our first-principles calculations predict that for superdense plasma mixtures, both interatomic radiative transitions and dipole-forbidden transitions can become comparable to the normal intra-atomic Kα-emission signal. These physics phenomena were not previously considered in detail for extreme high-density plasma mixtures at super-high energy densities.

Date: 2020
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DOI: 10.1038/s41467-020-15916-3

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