Journal Article Research Support, Non-U.S. Gov't bent crystals high-energy-resolution analysers inelastic X-ray scattering European XFEL Heisenberg RIXS Published Erratum RIXS X-ray Raman scattering X-ray resonant diffraction X-ray spectrometers bent analyser crystals charge order free-electron lasers hRIXS photochemistry position-sensitive detectors resonant X-ray diffraction resonant inelastic X-ray scattering soft X-rays spin dynamics spin order time-resolved spectroscopy