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

Area of Science:

• X-ray Spectroscopy
• Materials Science
• Instrumentation

Background:

• Resonant inelastic x-ray scattering (RIXS) is a powerful technique for probing electronic and magnetic excitations.
• Existing RIXS spectrometers face limitations in energy resolution and throughput.
• Development of advanced instrumentation is crucial for pushing the boundaries of RIXS science.

Purpose of the Study:

• To present a proof-of-principle design for a novel wavelength dispersive, parallel spectrometer for RIXS.
• To demonstrate the feasibility of using a multiple-channel reflection zone plate (RZP) array for RIXS.
• To optimize the design for high spectral resolution and efficient signal detection.

Main Methods:

• Simulated a spectrometer design based on a multiple-channel reflection zone plate (RZP) array.
• Calculated spectral resolution and energy range for Fe L-edge RIXS.
• Investigated the impact of exit aperture size on spectral resolution.
• Matched geometrical parameters to the PEAXIS end station at BESSY II.

Main Results:

• Achieved a resolving power of (0.2-2.6)×10^4 over a 21 eV energy range at the Fe L-edge (715 eV).
• Demonstrated that a 2D signal readout preserves spectral resolution for large exit apertures (≳50 mm^2).
• Confirmed technical feasibility with relaxed RZP line densities (<9×10^2 mm^-1).

Conclusions:

• The proposed RZP-based spectrometer design is technically feasible and offers high performance for RIXS.
• The design enables efficient spectral acquisition over a significant energy range.
• Error budget analysis provides a roadmap for fabricating and aligning RZP-based RIXS instruments.