Abstract
High-resolution spectroscopies that use hard x rays like nuclear resonant scattering and inelastic x-ray scattering require monochromatization to the meV level. Currently, tunable x-ray monochromators using silicon allow one to achieve sub-meV energy bandwidths in the 10–30 keV energy range. Attempts to improve the energy resolution beyond 108 encounter issues such as stability, efficiency, and crystal-quality-limited resolution. Cryogenically cooling the silicon can potentially mitigate the problems related to thermal stability, as well as improve the efficiency. Cooling high-resolution monochromators, while maintaining the requisite 10 nrad angular control over the crystals, poses a challenging technical problem. Recent attempts to improve the limits of energy resolution and to improve efficiency and stability of high-resolution monochromators with cryogenic cooling will be discussed.
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