title: Resonant inelastic X-ray scattering spectrometer with 25 meV resolution at the Cu K-edge.
abstract: An unparalleled resolution is reported with an inelastic X-ray scattering instrument at the Cu K-edge. Based on a segmented concave analyzer, featuring single-crystal quartz (SiO₂) pixels, the spectrometer delivers a resolution near 25 meV (FWHM) at 8981 eV. Besides the quartz analyzer, the performance of the spectrometer relies on a four-bounce Si(553) high-resolution monochromator and focusing Kirkpatrick-Baez optics. The measured resolution agrees with the ray-tracing simulation of an ideal spectrometer. The performance of the spectrometer is demonstrated by reproducing the phonon dispersion curve of a beryllium single-crystal.
authors.affiliation: Department of Engineering Physics, Faculty of Engineering, Ankara University, Ankara 06100, Turkey.
authors.forename: Didem
authors.initials: D
authors.lastname: Ketenoglu
authors.affiliation: Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany.
authors.forename: Manuel
authors.initials: M
authors.lastname: Harder
authors.affiliation: MAX IV Laboratory, Lund University, SE-22100 Lund, Sweden.
authors.forename: Konstantin
authors.initials: K
authors.lastname: Klementiev
authors.affiliation: Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA.
authors.forename: Mary
authors.initials: M
authors.lastname: Upton
authors.affiliation: Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany.
authors.forename: Mehran
authors.initials: M
authors.lastname: Taherkhani
authors.affiliation: Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany.
authors.forename: Manfred
authors.initials: M
authors.lastname: Spiwek
authors.affiliation: Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany.
authors.forename: Frank Uwe
authors.initials: FU
authors.lastname: Dill
authors.affiliation: Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany.
authors.forename: Hans Christian
authors.initials: HC
authors.lastname: Wille
authors.affiliation: Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany.
authors.forename: Hasan
authors.initials: H
authors.lastname: Yavaş
keywords: diced crystal analyzers; high energy-resolution; quartz; resonant inelastic X-ray scattering (RIXS)