Dielectronic satellite emission from a solid-density Mg plasma: Relationship to models of ionization potential depression

G. Pérez-Callejo, T. Gawne, T. R. Preston, P. Hollebon, O. S. Humphries, H.-K. Chung, G. L. Dakovski, J. Krzywinski, M. P. Minitti, T. Burian, J. Chalupský, V. Hájková, L. Juha, V. Vozda, U. Zastrau, S. M. Vinko, S. J. Rose, and J. S. Wark
Phys. Rev. E 109, 045204 – Published 10 April 2024

Abstract

We report on experiments where solid-density Mg plasmas are created by heating with the focused output of the Linac Coherent Light Source x-ray free-electron laser. We study the K-shell emission from the helium- and lithium-like ions using Bragg crystal spectroscopy. Observation of the dielectronic satellites in lithium-like ions confirms that the M-shell electrons appear bound for these high charge states. An analysis of the intensity of these satellites indicates that when modeled with an atomic-kinetics code, the ionization potential depression model employed needs to produce depressions for these ions which lie between those predicted by the well known Stewart-Pyatt and Ecker-Kroll models. These results are largely consistent with recent density functional theory calculations.

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  • Received 5 October 2023
  • Revised 23 December 2023
  • Accepted 1 March 2024

DOI:https://doi.org/10.1103/PhysRevE.109.045204

©2024 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & OpticalPlasma Physics

Authors & Affiliations

G. Pérez-Callejo1,*, T. Gawne2, T. R. Preston3, P. Hollebon2, O. S. Humphries3, H.-K. Chung4, G. L. Dakovski5, J. Krzywinski5, M. P. Minitti5, T. Burian6, J. Chalupský6, V. Hájková6, L. Juha6, V. Vozda6, U. Zastrau3, S. M. Vinko2,7, S. J. Rose8,2, and J. S. Wark2,†

  • 1Departamento de Física Teórica Atómica y Óptica, Universidad de Valladolid, 47011 Valladolid, Spain
  • 2Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom
  • 3European XFEL GmbH, Holzkoppel 4, 22869 Schenefeld, Germany
  • 4Korea Institute of Fusion Energy (KFE), Daejeon 34133, South Korea
  • 5Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
  • 6Department of Radiation and Chemical Physics, Institute of Physics, Czech Academy of Sciences, Na Slovance 2, 182 21 Prague 8, Czech Republic
  • 7Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
  • 8Plasma Physics Group, The Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2AZ, United Kingdom

  • *gabriel.perez.callejo@uva.es
  • justin.wark@physics.ox.ac.uk

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Vol. 109, Iss. 4 — April 2024

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