Reflection zone plate concept for resonant inelastic x-ray scattering spectrometry.

Applied optics

PubMedID: 28157908

Braig C, Löchel H, Rehanek J, Firsov A, Brzhezinskaya M, Erko A. Reflection zone plate concept for resonant inelastic x-ray scattering spectrometry. Appl Opt. 2017;56(3):515-520.
We simulate a proof-of-principle design of a wavelength dispersive, parallel spectrometer for use in resonant inelastic x-ray scattering (RIXS). The instrument relies on a multiple-channel reflection zone plate (RZP) array, enabling the recording of fluorescence spectra from an acceptance angle of 18??arc?min×19??arc?min with a mainly source-size-limited resolving power of (0. 2-2. 6)×104 over an energy range of 21 eV at the L-edge of Fe around 715 eV. An optimal two-dimensional signal readout preserves the spectral resolution to a large extent for widely open exit apertures of ?50??mm2. The geometrical parameters are matched to the PEAXIS end station at the BESSY II synchrotron facility, and relaxed RZP line densities of <9×102??mm-1 assure the technical feasibility. An error budget estimation with respect to fabrication and alignment tolerances provides the link to real, RZP-based RIXS experiments in the future.