X-ray Thomson Scattering in Warm Dense Matter without the Chihara Decomposition
Open Access
- 18 March 2016
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 116 (11), 115004
- https://doi.org/10.1103/physrevlett.116.115004
Abstract
X-ray Thomson scattering is an important experimental technique used to measure the temperature, ionization state, structure, and density of warm dense matter (WDM). The fundamental property probed in these experiments is the electronic dynamic structure factor. In most models, this is decomposed into three terms [J. Chihara, J. Phys. F 17, 295 (1987)] representing the response of tightly bound, loosely bound, and free electrons. Accompanying this decomposition is the classification of electrons as either bound or free, which is useful for gapped and cold systems but becomes increasingly questionable as temperatures and pressures increase into the WDM regime. In this work we provide unambiguous first principles calculations of the dynamic structure factor of warm dense beryllium, independent of the Chihara form, by treating bound and free states under a single formalism. The computational approach is real-time finite-temperature time-dependent density functional theory (TDDFT) being applied here for the first time to WDM. We compare results from TDDFT to Chihara-based calculations for experimentally relevant conditions in shock-compressed beryllium.Keywords
Funding Information
- Laboratory Directed Research and Development (165731)
- Fusion Energy Sciences
- U.S. Department of Energy (DE-AC04-94AL85000)
This publication has 49 references indexed in Scilit:
- First-principles thermal conductivity of warm-dense deuterium plasmas for inertial confinement fusion applicationsPhysical Review E, 2014
- Shock and post-shock temperatures in an ice–quartz mixture: implications for melting during planetary impact eventsEarth and Planetary Science Letters, 2010
- The Interior Structure, Composition, and Evolution of Giant PlanetsSpace Science Reviews, 2009
- X-ray Thomson scattering in high energy density plasmasReviews of Modern Physics, 2009
- X-Ray Thomson-Scattering Measurements of Density and Temperature in Shock-Compressed BerylliumPhysical Review Letters, 2009
- Perspectives on high-energy-density physicsPhysics of Plasmas, 2009
- Observations of Plasmons in Warm Dense MatterPhysical Review Letters, 2007
- Pulsed-power-driven high energy density physics and inertial confinement fusion researchPhysics of Plasmas, 2005
- Theoretical model of x-ray scattering as a dense matter probePhysical Review E, 2003
- Interiors of Giant Planets Inside and Outside the Solar SystemScience, 1999