Resonant inelastic x-ray scattering in warm-dense Fe compounds beyond the SASE FEL resolution limit
Communications Physics Nature Research 7:1 (2024) 266
Abstract:
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.
Phase transitions of Fe2O3 under laser shock compression
under review for Physical Review Letters
Abstract:
We present in-situ x-ray diffraction and velocity measurements of Fe2O3 under laser shock compression at pressures between 38-116 GPa. None of the phases reported by static compression studies were observed. Instead, we observed an isostructural phase transition from α-Fe2O3 to a new α′-Fe2O3 phase at a pressure of 50-62 GPa. The α′-Fe2O3 phase differs from α-Fe2O3 by an 11% volume drop and a different unit cell compressibility. We further observed a two-wave structure in the velocity profile, which can be related to an intermediate regime where both α and α′ phases coexist. Density functional theory calculations with a Hubbard parameter indicate that the observed unit cell volume drop can be associated with a spin transition following a magnetic collapse.
The Xe‐SiO2 System at Moderate Pressure and High Temperature
Geochemistry Geophysics Geosystems American Geophysical Union (AGU) 20:2 (2019) 992-1003
The Xe-SiO2 system at Moderate pressure and High temperature conditions.
Geochemistry, Geophysics, Geosystems 20 (2), pp 992-1003.
Abstract:
Kr environments in a feldspathic glass and melt: a high pressure, high temperature X-ray absorption study.
Chemical Geology 493, pp 525-531.