Dispersive spread of virtual sources by asymmetric X-ray monochromators

The principles of the virtual source spread (spatial broadening) phenomenon induced by angular dispersion in asymmetric X‐ray Bragg reflections are illustrated, from which the virtual source properties are analyzed for typical high‐resolution multiple‐crystal monochromators, including inline four‐bo...

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Published in:Journal of applied crystallography 2012-04, Vol.45 (2), p.255-262
Main Authors: Huang, X. R., Macrander, A. T., Honnicke, M. G., Cai, Y. Q., Fernandez, Patricia
Format: Article
Language:English
Subjects:
Asymmetry
Beams (radiation)
Crystallography
Dispersion
Dispersions
inelastic X-ray scattering
Monochromators
Nanostructure
Spectroscopy
Spreads
virtual sources
X-ray focusing
X-ray optics
X-rays
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cited_by cdi_FETCH-LOGICAL-c4869-375a02ae686b2abdf8d0e66c9a0251a6664874bca556c8c278798fbe594a77ab3
cites cdi_FETCH-LOGICAL-c4869-375a02ae686b2abdf8d0e66c9a0251a6664874bca556c8c278798fbe594a77ab3
container_end_page 262
container_issue 2
container_start_page 255
container_title Journal of applied crystallography
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creator Huang, X. R.
Macrander, A. T.
Honnicke, M. G.
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Fernandez, Patricia
description The principles of the virtual source spread (spatial broadening) phenomenon induced by angular dispersion in asymmetric X‐ray Bragg reflections are illustrated, from which the virtual source properties are analyzed for typical high‐resolution multiple‐crystal monochromators, including inline four‐bounce dispersive monochromators, back‐reflection‐dispersion monochromators and nondispersive nested channel‐cut monochromators. It is found that dispersive monochromators can produce spread virtual sources of a few millimetres in size, which may prevent efficient microfocusing of the beam as required by inelastic X‐ray scattering spectroscopy and other applications. Possible schemes to mitigate this problem are discussed. The analyses may provide important guidelines for designing and optimizing modern high‐precision synchrotron X‐ray optics and beamline instrumentation for spectroscopy, imaging and nanofocusing applications.
doi_str_mv 10.1107/S0021889812003366
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source Wiley-Blackwell Read & Publish Collection
subjects Asymmetry
Beams (radiation)
Crystallography
Dispersion
Dispersions
inelastic X-ray scattering
Monochromators
Nanostructure
Spectroscopy
Spreads
virtual sources
X-ray focusing
X-ray optics
X-rays
title Dispersive spread of virtual sources by asymmetric X-ray monochromators
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