Abstract
The IRIXS Spectrograph represents a new design of an ultra-high-resolution resonant inelastic X-ray scattering (RIXS) spectrometer that operates at the RuL3-edge (2840 eV). First proposed in the field of hard X-rays by Shvyd'ko [(2015), Phys. Rev. A, 91, 053817], the X-ray spectrograph uses a combination of laterally graded multilayer mirrors and collimating/dispersing Ge(111) crystals optics in a novel spectral imaging approach to overcome the energy resolution limitation of a traditional Rowland-type spectrometer [Gretarsson et al. (2020), J. Synchrotron Rad. 27, 538-544]. In combination with a dispersionless nested four-bounce high-resolution monochromator design that utilizes Si(111) and Al2O3(110) crystals, an overall energy resolution better than 35 meV full width at half-maximum has been achieved at the Ru L3-edge, in excellent agreement with ray-tracing simulations.
Highlights
Resonant inelastic X-ray scattering (RIXS) is a powerful technique capable of studying the momentum, energy and polarization dependency of intra- and inter-atomic charge, spin, orbital and lattice excitations of matter (Ament et al, 2011)
In combination with a novel narrow bandwidth (30 meV full width at half-maximum (FWHM)) dispersionless nested fourbounce high-resolution monochromator, we demonstrate an overall energy resolution better than 35 meV FWHM
The trend was fitted with a simple linear function from which a slope of meV mmÀ1 was extracted, in good agreement with our meV mmÀ1 estimate. With this number at hand we obtain a calculated FWHM of 121 meV and 31 meV for the double-crystal monochromator (DCM) and high-resolution monochromator (HRM) signals, respectively. We can compare the latter value with the simulated intrinsic spectrograph resolution of 15 meV [see Fig. 6(a)], which suggests that the instrument is primarily resolution limited by the incident bandwidth in the current design
Summary
Resonant inelastic X-ray scattering (RIXS) is a powerful technique capable of studying the momentum, energy and polarization dependency of intra- and inter-atomic charge, spin, orbital and lattice excitations of matter (Ament et al, 2011). The intermediate X-ray energy RIXS instrument IRIXS (Gretarsson et al, 2020), located at beamline P01 of the PETRA III synchrotron in Hamburg, Germany, has successfully implemented a hard X-ray optic type layout for highresolution Ru L3-edge RIXS (Suzuki et al, 2019, 2020; Gretarsson et al, 2019; Bertinshaw et al, 2021) It uses Bragg reflections from asymmetrically cut Si(111) single crystals in a dispersive four-bounce monochromator, and a SiO2(102") spherically bent and diced analyzer, giving an overall resolution of $ 75 meV full width at half-maximum (FWHM). In combination with a novel narrow bandwidth (30 meV FWHM) dispersionless nested fourbounce high-resolution monochromator, we demonstrate an overall energy resolution better than 35 meV FWHM
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