Abstract
Abstract MERIX (Medium Energy Resolution Inelastic X-ray Scattering) is an instrument for Resonant Inelastic X-ray Scattering (RIXS) studies, in the hard X-ray regime, designed to work with photons in the 5–12 keV range, spanning atomic resonances near the K-edges of 3d elements, and the L-edges of 4f and 5d elements. The energy analysis of inelastically scattered photons is performed with segmented spherical crystal analyzers in close to Bragg backscattering geometry. For each resonance (edge) a specially designed analyzer is used, fabricated from Ge, Si, or LiNbO 3 crystals. MERIX uses a position sensitive (micro-strip) detector to take snapshots of IXS spectra which are dispersed in space and over an energy range of a few eV with ≃20–40 meV energy resolution. The spectral resolution of the MERIX spectrometer depends on the analyzer and varies from ≃45 meV to ≃170 meV, while the momentum transfer resolution is ≃1–4 nm −1 . Samples are illuminated by micro-focused beams of size ≃10 μm × 45 μm, allowing for studies at high-pressure and other extreme conditions. Polarization selectivity is ensured by vertical or horizontal momentum transfer scans. MERIX features ≃100 times higher count-rates compared to previously built RIXS instruments.
Published Version
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