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2010•Journal of Applied CrystallographyRequires access

Optimization of a bent perfect Si(111) monochromator at a small take-off angle for use in a stress instrument

Baek‐Seok Seong, В. Т. Эм, P. Mikula, Jan Šaroun, Mihyun Kang

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Abstract

The reflectivity and resolution properties of focusing cylindrically bent perfect crystal Si(111) monochromators of different diffraction geometries were tested with the aim of evaluating their possible use in a stress instrument with an unusually small take-off angle (2θM≃ 30°). The experiments showed that an Si crystal with reflecting planes (111) in the symmetric diffraction geometry provides a maximum figure of merit for accuracy in the peak position that is comparable to that achieved previously from an optimized Si(220) monochromator at 2θM≃ 55°.

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The reflectivity and resolution properties of focusing cylindrically bent perfect crystal Si(111) monochromators of different diffraction geometries were tested with the aim of evaluating their possible use in a stress instrument with an unusually small take-off angle (2θM≃ 30°). The experiments showed that an Si crystal with reflecting planes (111) in the symmetric diffraction geometry provides a maximum figure of merit for accuracy in the peak position that is comparable to that achieved previously from an optimized Si(220) monochromator at 2θM≃ 55°.

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Available abstract

The reflectivity and resolution properties of focusing cylindrically bent perfect crystal Si(111) monochromators of different diffraction geometries were tested with the aim of evaluating their possible use in a stress instrument with an unusually small take-off angle (2θM≃ 30°). The experiments showed that an Si crystal with reflecting planes (111) in the symmetric diffraction geometry provides a maximum figure of merit for accuracy in the peak position that is comparable to that achieved previously from an optimized Si(220) monochromator at 2θM≃ 55°.

Key concepts: Monochromator, Bent molecular geometry, Optics, Diffraction, Figure of merit, Crystal (programming language), Resolution (logic), Position (finance)

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