Skip to Main content Skip to Navigation
Journal articles

Carbon ionization at gigabar pressures: An ab initio perspective on astrophysical high-density plasmas

Abstract : A realistic description of partially ionized matter in extreme thermodynamic states is critical to model the interior and evolution of the multiplicity of high-density astrophysical objects. Current predictions of its essential property, the ionization degree, rely widely on analytical approximations that have been challenged recently by a series of experiments. Here, we propose an ab initio approach to calculate the ionization degree directly from the dynamic electrical conductivity using the Thomas-Reiche-Kuhn sum rule. This density functional theory framework captures genuinely the condensed-matter nature and quantum effects typical for strongly correlated plasmas. We demonstrate this capability for carbon and hydrocarbon, which most notably serve as ablator materials in inertial confinement fusion experiments aiming at recreating stellar conditions. We find a significantly higher carbon ionization degree than predicted by commonly used models, yet validating the qualitative behavior of the average atom model uc(purgatorio). Additionally, we find the carbon ionization state to remain unchanged in the environment of fully ionized hydrogen. Our results will not only serve as benchmark for traditional models, but more importantly provide an experimentally accessible quantity in the form of the electrical conductivity.
Document type :
Journal articles
Complete list of metadata
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Thursday, June 30, 2022 - 5:19:32 PM
Last modification on : Tuesday, September 13, 2022 - 10:08:28 AM


Publisher files allowed on an open archive


Distributed under a Creative Commons Attribution 4.0 International License




Mandy Bethkenhagen, Bastian B. L. Witte, Maximilian Schörner, Gerd Röpke, Tilo Döppner, et al.. Carbon ionization at gigabar pressures: An ab initio perspective on astrophysical high-density plasmas. Physical Review Research, American Physical Society, 2020, 2, ⟨10.1103/PhysRevResearch.2.023260⟩. ⟨insu-03710131⟩



Record views


Files downloads