Ab-initio simulations and measurements of the free-free opacity in Aluminum

Abstract

The free-free opacity in dense systems is a property that both tests our fundamental understanding of correlated many-body systems, and is needed to understand the radiative properties of high energy-density plasmas. Despite its importance, predictive calculations of the free-free opacity remain challenging even in the condensed matter phase for simple metals. Here we show how the free-free opacity can be modelled at finite-temperatures via time-dependent density functional theory, and illustrate the importance of including local field corrections, core polarization and self-energy corrections. Our calculations for ground-state Al are shown to agree well with experimental opacity measurements performed on the Artemis laser facility across a wide range of x-ray to ultraviolet wavelengths. We extend our calculations across the melt to the warm-dense matter regime, and find good agreement with advanced plasma models based on inverse bremsstrahlung at temperatures above 10 eV.

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• X-Ray Thomson scattering without the Chihara decomposition
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• Analytic continuation-free Green's function approach to correlated electronic structure calculations

Cited by in corpus (12)

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• Linear-response time-dependent density functional theory approach to warm dense matter with adiabatic exchange--correlation kernels
• Mapping the Electronic Structure of Warm Dense Nickel via Resonant Inelastic X-ray Scattering
• Time-resolved XUV Opacity Measurements of Warm-Dense Aluminium
• Excited States in Warm and Hot Dense Matter
• Correlations Between Conduction Electrons in Dense Plasmas
• On collisional free-free photon absorption in warm dense matter
• Charge State Distributions in Dense Plasmas
• Electron Dynamics at High-Energy Densities in Nickel from Non-linear Resonant X-ray Absorption Spectra
• A Rate Model of Electron Populations for Non-linear High-Fluence X-ray Absorption Near-Edge Spectra
• Exploring relaxation dynamics in warm dense plasmas by tailoring non-thermal electron distributions with a free electron laser
• High-temperature self-energy corrections to x-ray absorption spectra