4 research outputs found
Resonant inelastic x-ray scattering in warm-dense Fe compounds beyond the SASE FEL resolution limit
Resonant inelastic x-ray scattering (RIXS) is a widely used spectroscopic
technique, providing access to the electronic structure and dynamics of atoms,
molecules, and solids. However, RIXS requires a narrow bandwidth x-ray probe to
achieve high spectral resolution. The challenges in delivering an energetic
monochromated beam from an x-ray free electron laser (XFEL) thus limit its use
in few-shot experiments, including for the study of high energy density
systems. Here we demonstrate that by correlating the measurements of the
self-amplified spontaneous emission (SASE) spectrum of an XFEL with the RIXS
signal, using a dynamic kernel deconvolution with a neural surrogate, we can
achieve electronic structure resolutions substantially higher than those
normally afforded by the bandwidth of the incoming x-ray beam. We further show
how this technique allows us to discriminate between the valence structures of
Fe and FeO, and provides access to temperature measurements as well as
M-shell binding energies estimates in warm-dense Fe compounds
Resonant inelastic x-ray scattering in warm-dense Fe compounds beyond the SASE FEL resolution limit
Resonant inelastic x-ray scattering (RIXS) is a widely used spectroscopic technique, providing access to the electronic structure and dynamics of atoms, molecules, and solids. However, RIXS requires a narrow bandwidth x-ray probe to achieve high spectral resolution. The challenges in delivering an energetic monochromated beam from an x-ray free electron laser (XFEL) thus limit its use in few-shot experiments, including for the study of high energy density systems. Here we demonstrate that by correlating the measurements of the self-amplified spontaneous emission (SASE) spectrum of an XFEL with the RIXS signal, using a dynamic kernel deconvolution with a neural surrogate, we can achieve electronic structure resolutions substantially higher than those normally afforded by the bandwidth of the incoming x-ray beam. We further show how this technique allows us to discriminate between the valence structures of Fe and Fe2O3, and provides access to temperature measurements as well as M-shell binding energies estimates in warm-dense Fe compounds
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Behavior of soda-lime silicate glass under laser-driven shock compression up to 315 GPa
Shock experiments give a unique insight into the behavior of matter subjected to extremely high pressures and temperatures. Understanding the behavior of materials under such extreme conditions is key to modeling material failure and deformation dynamics under impact. While studies on pure silica are extensive, the shock behavior of other commercial silicates that contain additional oxides has not been systematically investigated. To better understand the role of composition in the dynamic behavior of silicates, we performed laser-driven dynamic compression experiments on soda-lime glass (SLG) up to 315 GPa. Using the accurate pulse shaping offered by the long pulse laser system at the Matter in Extreme Conditions end-station at the Linac Coherent Light Source, SLG was shock compressed along the Hugoniot to multiple pressure-temperature points. Velocity Interferometer System for Any Reflector was used to measure the velocity and determine the pressure inside the SLG. The U s -u p relationship obtained agrees well with the previous parallel plate impact studies. Within the error bars, no transformation to the crystalline phase was observed up to 70 GPa, which is in contrast to the behavior of pure silica under shock compression. Our studies show that the glass composition strongly influences the shock compression behavior of the silicate glasses