Theoretical treatments of the bound-free contribution and experimental best practice in X-ray Thomson scattering from warm dense matter

Journal Article · Fri Feb 15 04:00:00 EST 2013 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4790659· OSTI ID:22113456

Mattern, Brian A.; Seidler, Gerald T. ^[1]

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1. Department of Physics, University of Washington, Seattle, Washington 98195-1560 (United States)

By comparison with high-resolution synchrotron x-ray experimental results, we assess several theoretical treatments for the bound-free (core-electron) contribution to x-ray Thomson scattering (i.e., also known as nonresonant inelastic x-ray scattering). We identify an often overlooked source of systematic error in the plane-wave form factor approximation (PWFFA) used in the inference of temperature, ionization state, and free electron density in some laser-driven compression studies of warm dense matter. This error is due to a direct violation of energy conservation in the PWFFA. We propose an improved practice for the bound-free term that will be particularly relevant for XRTS experiments performed with somewhat improved energy resolution at the National Ignition Facility or the Linac Coherent Light Source. Our results raise important questions about the accuracy of state variable determination in XRTS studies, given that the limited information content in low-resolution XRTS spectra does not strongly constrain the models of electronic structure being used to fit the spectra.

• OSTI ID: 22113456
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 2 Vol. 20; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
COMPRESSION
ELECTRON DENSITY
ELECTRON TEMPERATURE
ELECTRONIC STRUCTURE
ENERGY CONSERVATION
ENERGY RESOLUTION
FORM FACTORS
ION TEMPERATURE
LASER RADIATION
LINEAR ACCELERATORS
PLASMA DENSITY
PLASMA DIAGNOSTICS
PLASMA PRODUCTION
SPECTRA
THOMSON SCATTERING
US NATIONAL IGNITION FACILITY
WAVE PROPAGATION
X RADIATION
X-RAY DIFFRACTION