Ultrahigh Resolution X-ray Thomson Scattering Measurements at the European XFEL
arxiv(2024)
Abstract
Using a novel ultrahigh resolution (Δ E ∼ 0.1eV) setup to measure
electronic features in x-ray Thomson scattering (XRTS) experiments at the
European XFEL in Germany, we have studied the collective plasmon excitation in
aluminium at ambient conditions, which we can measure very accurately even at
low momentum transfers. As a result, we can resolve previously reported
discrepancies between ab initio time-dependent density functional theory
simulations and experimental observations. The demonstrated capability for
high-resolution XRTS measurements will be a game changer for the diagnosis of
experiments with matter under extreme densities, temperatures, and pressures,
and unlock the full potential of state-of-the-art x-ray free electron laser
(XFEL) facilities to study planetary interior conditions, to understand
inertial confinement fusion applications, and for material science and
discovery.
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