15 October 2012 Enhanced x-ray angular dispersion and x-ray spectrographs with resolving power beyond 108
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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. In visible light optics this is easily achieved with diffraction gratings. In hard x-ray regime this is a problem. Here we show, on the example of CDW x-ray optics, 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/ΔE approximate > 108
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Yuri Shvyd'ko, Yuri Shvyd'ko, } "Enhanced x-ray angular dispersion and x-ray spectrographs with resolving power beyond 108", Proc. SPIE 8502, Advances in X-Ray/EUV Optics and Components VII, 85020J (15 October 2012); doi: 10.1117/12.930442; https://doi.org/10.1117/12.930442
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