Ultrafast energy-dispersive soft-x-ray diffraction in the water window with a laser-driven source

• DOI: 10.48550/arxiv.2407.05964
• Publication Date: 2024-07-08
• Authors: Jasmin Jarecki; M. Hennecke; Themistoklis P. H...; Matthias Schnuerer; Stefan Eisebitt; Daniel Schick
• Keywords: Water window

Time-resolved soft-x-ray-diffraction experiments give access to microscopic processes in a broad range of solid-state materials by probing ultrafast dynamics ordering phenomena. While laboratory-based high-harmonic generation (HHG) light sources provide the required photon energies, their limited flux is distributed over wide spectral range, rendering typical monochromatic diffraction schemes challenging. Here, we present scheme for energy-dispersive soft-x-ray with femtosecond temporal resolution and energies across water window from 200 600 eV. The experiment utilizes broadband nature HHG emission efficiently probe large slices reciprocal space. As proof-of-concept, study laser-induced structural Mo/Si superlattice an ultrafast, non-resonant experiment. We extract underlying strain measured shift its first order Bragg peak space at around 500 eV via scattering simulations.