An alternative scheme of angular-dispersion analyzers for high-resolution medium-energy inelastic X-ray scattering

Physics – Optics

Scientific paper

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Accepted by Journal of Synchrotron Radiation (submitted date March 28, 2011); 6 figures, 13 pages

Scientific paper

The development of medium-energy inelastic X-ray scattering (IXS) optics with meV and sub-meV resolution has attracted considerable efforts in recent years. Meanwhile, there are also concerns or debates about the fundamental and feasibility of the involved schemes. Here the central optical component, the back-reflection angular-dispersion monochromator or analyzer, is analyzed. The results show that the multiple-beam diffraction effect together with transmission-induced absorption can noticeably reduce the diffraction efficiency, although it may not be a fatal threat. In order to improve the efficiency, a simple four-bounce analyzer is proposed that completely avoids these two adverse effects. The new scheme is illustrated to be a feasible alternative approach for developing meV- to sub-meV-resolution IXS spectroscopy.

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