A bicrystal monochromator of moderate wavelength resolution for use with X‐rays or thermal neutrons | Zendy

Bauspiess W. | Zendy; Bonse U. | Zendy; Graeff W. | Zendy; Rauch H. | Zendy

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A bicrystal monochromator of moderate wavelength resolution for use with X‐rays or thermal neutrons

Author(s) -

Bauspiess W.,

Bonse U.,

Graeff W.,

Rauch H.

Publication year - 1977

Publication title -

journal of applied crystallography

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.429

H-Index - 162

ISSN - 1600-5767

DOI - 10.1107/s0021889877013570

Subject(s) - monochromator , optics , misorientation , wavelength , bragg's law , germanium , neutron , materials science , silicon , radiation , resolution (logic) , physics , diffraction , optoelectronics , microstructure , quantum mechanics , artificial intelligence , computer science , grain boundary , metallurgy

A new type of crystal monochromator is presented which facilitates the selection of a precisely fixed wavelength λ 0 from a continuum at an intermediate bandwidth Δλ/λ of typically 10 −3 . Its essential feature is consecutive Bragg reflections from two crystals with slightly different Bragg‐plane spacings glued rigidly together at near‐parallel orientation. The bicrystal effectively manifests a wavelength standard the exact value of which is determined by the angle β of misorientation of the two crystals. The application of a germanium–silicon version of the new device to neutron interferometry is described. The influence of ray geometry on the values of λ 0 and Δλ is discussed.

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