Measurements of continuum lowering in solid-density plasmas created from elements and compounds

O. Ciricosta (), S. M. Vinko, B. Barbrel, D. S. Rackstraw, T. R. Preston, T. Burian, J. Chalupský, B. I. Cho, H. -K. Chung, G. L. Dakovski, K. Engelhorn, V. Hájková, P. Heimann, M. Holmes, L. Juha, J. Krzywinski, R. W. Lee, S. Toleikis, J. J. Turner, U. Zastrau and J. S. Wark
Additional contact information
O. Ciricosta: Clarendon Laboratory, University of Oxford
S. M. Vinko: Clarendon Laboratory, University of Oxford
B. Barbrel: UC Berkeley
D. S. Rackstraw: Clarendon Laboratory, University of Oxford
T. R. Preston: Clarendon Laboratory, University of Oxford
T. Burian: Institute of Physics ASCR
J. Chalupský: Institute of Physics ASCR
B. I. Cho: Center for Relativistic Laser Science, Institute for Basic Science (IBS)
H. -K. Chung: Atomic and Molecular Data Unit, Nuclear Data Section, IAEA
G. L. Dakovski: SLAC National Accelerator Laboratory
K. Engelhorn: Lawrence Berkeley National Laboratory
V. Hájková: Institute of Physics ASCR
P. Heimann: SLAC National Accelerator Laboratory
M. Holmes: SLAC National Accelerator Laboratory
L. Juha: Institute of Physics ASCR
J. Krzywinski: SLAC National Accelerator Laboratory
R. W. Lee: University of California
S. Toleikis: Deutsches-Elektronensynchrotron DESY
J. J. Turner: SLAC National Accelerator Laboratory
U. Zastrau: SLAC National Accelerator Laboratory
J. S. Wark: Clarendon Laboratory, University of Oxford

Nature Communications, 2016, vol. 7, issue 1, 1-6

Abstract: Abstract The effect of a dense plasma environment on the energy levels of an embedded ion is usually described in terms of the lowering of its continuum level. For strongly coupled plasmas, the phenomenon is intimately related to the equation of state; hence, an accurate treatment is crucial for most astrophysical and inertial-fusion applications, where the case of plasma mixtures is of particular interest. Here we present an experiment showing that the standard density-dependent analytical models are inadequate to describe solid-density plasmas at the temperatures studied, where the reduction of the binding energies for a given species is unaffected by the different plasma environment (ion density) in either the element or compounds of that species, and can be accurately estimated by calculations only involving the energy levels of an isolated neutral atom. The results have implications for the standard approaches to the equation of state calculations.

Date: 2016
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DOI: 10.1038/ncomms11713

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