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A von Hámos spectrometer for diamond anvil cell experiments at the High Energy Density Instrument of the European X‐ray Free‐Electron Laser
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A von Hámos spectrometer for diamond anvil cell experiments at the High Energy Density Instrument of the European X‐ray Free‐Electron Laser
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A von Hámos spectrometer for diamond anvil cell experiments at the High Energy Density Instrument of the European X‐ray Free‐Electron Laser
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Journal Article
A von Hámos spectrometer for diamond anvil cell experiments at the High Energy Density Instrument of the European X‐ray Free‐Electron Laser
2023
Overview
A von Hámos spectrometer has been implemented in the vacuum interaction chamber 1 of the High Energy Density instrument at the European X‐ray Free‐Electron Laser facility. This setup is dedicated, but not necessarily limited, to X‐ray spectroscopy measurements of samples exposed to static compression using a diamond anvil cell. Si and Ge analyser crystals with different orientations are available for this setup, covering the hard X‐ray energy regime with a sub‐eV energy resolution. The setup was commissioned by measuring various emission spectra of free‐standing metal foils and oxide samples in the energy range between 6 and 11 keV as well as low momentum‐transfer inelastic X‐ray scattering from a diamond sample. Its capabilities to study samples at extreme pressures and temperatures have been demonstrated by measuring the electronic spin‐state changes of (Fe0.5Mg0.5)O, contained in a diamond anvil cell and pressurized to 100 GPa, via monitoring the Fe Kβ fluorescence with a set of four Si(531) analyser crystals at close to melting temperatures. The efficiency and signal‐to‐noise ratio of the spectrometer enables valence‐to‐core emission signals to be studied and single pulse X‐ray emission from samples in a diamond anvil cell to be measured, opening new perspectives for spectroscopy in extreme conditions research. The implementation of a von Hámos spectrometer for diamond anvil cell experiments at the High Energy Density Instrument of the EuXFEL is described.
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