The Heisenberg-RIXS instrument at the European XFEL
arxiv(2024)
摘要
Resonant Inelastic X-ray Scattering (RIXS) is an ideal X-ray spectroscopy
method to push the combination of energy and time resolutions to the Fourier
transform ultimate limit, because it is unaffected by the core-hole lifetime
energy broadening. And in pump-probe experiments the interaction time is made
very short by the same core-hole lifetime. RIXS is very photon hungry so it
takes great advantage from high repetition rate pulsed X-ray sources like the
European XFEL. The hRIXS instrument is designed for RIXS experiments in the
soft X-ray range with energy resolution approaching the Fourier and the
Heisenberg limits. It is based on a spherical grating with variable line
spacing (VLS) and a position-sensitive 2D detector. Initially, two gratings are
installed to adequately cover the whole photon energy range. With optimized
spot size on the sample and small pixel detector the energy resolution can be
better than 40 meV at any photon energy below 1000 eV. At the SCS instrument of
the European XFEL the spectrometer can be easily positioned thanks to air-pads
on a high-quality floor, allowing the scattering angle to be continuously
adjusted over the 65-145 deg range. It can be coupled to two different sample
interaction chamber, one for liquid jets and one for solids, each equipped at
the state-of-the-art and compatible for optical laser pumping in collinear
geometry. The measured performances, in terms of energy resolution and count
rate on the detector, closely match design expectations. hRIXS is open to
public users since the summer of 2022.
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