Link between K-absorption edges and thermodynamic properties of warm-dense plasmas established by improved first-principles method

Abstract

A precise calculation that translates shifts of X-ray K-absorption edges to variations of thermodynamic properties allows quantitative characterization of interior thermodynamic properties of warm dense plasmas by X-ray absorption techniques, which provides essential information for inertial confinement fusion and other astrophysical applications. We show that this interpretation can be achieved through an improved first-principles method. Our calculation shows that the shift of K-edges exhibits selective sensitivity to thermal parameters and thus would be a suitable temperature index to warm dense plasmas. We also show with a simple model that the shift of K-edges can be used to detect inhomogeneity inside warm dense plasmas when combined with other experimental tools.

References in corpus (2)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Ab Initio Simulations of Dense Helium Plasmas

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• Finite temperature density functional theory investigation to the nonequilibrium transient warm dense state created by laser excitation
• Plane-Wave-Based Stochastic-Deterministic Density Functional Theory for Extended Systems