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A synchrotron radiation monochromator suppressing harmonics
Author(s) -
Treimer W.,
Hildebrandt G.
Publication year - 1989
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/s0021889888010908
Subject(s) - monochromator , harmonics , synchrotron radiation , optics , collimated light , wavelength , synchrotron , physics , reflection (computer programming) , harmonic , bragg's law , diffraction , laser , quantum mechanics , voltage , computer science , programming language
The use of asymmetric Bragg reflection offers the possibility of separating wavelength bands belonging to a fundamental wavelength and its higher harmonics from each other. This is shown in an example calculated for X‐rays. Especially for well collimated synchrotron radiation the subsequent use of symmetric and asymmetric reflections in a double‐crystal arrangement results in different large shifts of the reflected peaks. This kind of synchrotron monochromator offers two important improvements with respect to other similar monochromator systems: ( a ) it is tunable to the harmonics of a fundamental wavelength in a large range, e.g. from 0.4 to 2.7 Å; and ( b ) it works harmonic free for each wavelength band on top of the Darwin curve.