Enhanced X-Ray Angular Dispersion and X-ray Spectrographs with Resolving Power Beyond 10${}^8$

Abstract

Spectrograph is an optical device that is used to disperse photons of different energies $E$ into distinct directions and space locations, and to take a snapshot of the whole spectrum of photon energies with a spatially sensitive photon detector. Substantial advantage of a spectrograph over an ordinary spectral analyzer, is its ability to deal with many photon energies simultaneously, thus reducing exposure time per spectrum considerably. To realize a spectrograph, dispersing elements with large angular dispersion rate are required. Here we show, on the example of CDW x-ray optics [1-3], that multi-crystal arrangements may feature cumulative angular dispersion rates more than an order of magnitude larger than those attainable in single Bragg reflections. This makes, first, hard x-ray spectrographs feasible, and, secondly, a resolving power beyond $E/\Delta E\gtrsim 10^8$ achievable.

Cited by in corpus (5)

• Novel opportunities for sub-meV inelastic X-ray scattering at high-repetition rate self-seeded X-ray free-electron lasers
• Hard X-ray Spectrographs with Resolution Beyond 100 micro-eV
• Theory of angular dispersive imaging hard x-ray spectrographs
• Maximizing Spectral Flux from Self-Seeding Hard X-ray FELs
• Ultra high energy resolution focusing monochromator for inelastic X-ray scattering spectrometer