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arXiv · 2310.03590

Dielectronic satellite emission from a solid-density Mg plasma: relationship to models of ionisation 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·J. S. Wark
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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 modelled with an atomic-kinetics code, the ionisation 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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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, J. S. Wark. 2023-10-05. Dielectronic satellite emission from a solid-density Mg plasma: relationship to models of ionisation potential depression. https://doi.org/10.1103/physreve.109.045204

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