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Performance of nearly fixed offset asymmetric channel-cut crystals for X-ray monochromators

X-ray double-crystal monochromators face a shift of the exit beam when the Bragg angle and thus the transmitted photon energy changes. This can be compensated for by moving one or both crystals accordingly. In the case of monolithic channel-cut crystals, which exhibit utmost stability, the shift of...

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Autores principales: Frahm, Ronald, Diao, Qianshun, Murzin, Vadim, Bornmann, Benjamin, Lützenkirchen-Hecht, Dirk, Hong, Zhen, Li, Tang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: International Union of Crystallography 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6853379/
https://www.ncbi.nlm.nih.gov/pubmed/31721730
http://dx.doi.org/10.1107/S1600577519011123
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author Frahm, Ronald
Diao, Qianshun
Murzin, Vadim
Bornmann, Benjamin
Lützenkirchen-Hecht, Dirk
Hong, Zhen
Li, Tang
author_facet Frahm, Ronald
Diao, Qianshun
Murzin, Vadim
Bornmann, Benjamin
Lützenkirchen-Hecht, Dirk
Hong, Zhen
Li, Tang
author_sort Frahm, Ronald
collection PubMed
description X-ray double-crystal monochromators face a shift of the exit beam when the Bragg angle and thus the transmitted photon energy changes. This can be compensated for by moving one or both crystals accordingly. In the case of monolithic channel-cut crystals, which exhibit utmost stability, the shift of the monochromated beam is inevitable. Here we report performance tests of novel, asymmetrically cut, channel-cut crystals which reduce the beam movements by more than a factor of 20 relative to the symmetric case over the typical energy range of an EXAFS spectrum at the Cu K-edge. In addition, the presented formulas for the beam offset including the asymmetry angle directly indicate the importance of this value, which has been commonly neglected so far in the operation of double-crystal monochromators.
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spelling pubmed-68533792019-11-15 Performance of nearly fixed offset asymmetric channel-cut crystals for X-ray monochromators Frahm, Ronald Diao, Qianshun Murzin, Vadim Bornmann, Benjamin Lützenkirchen-Hecht, Dirk Hong, Zhen Li, Tang J Synchrotron Radiat Research Papers X-ray double-crystal monochromators face a shift of the exit beam when the Bragg angle and thus the transmitted photon energy changes. This can be compensated for by moving one or both crystals accordingly. In the case of monolithic channel-cut crystals, which exhibit utmost stability, the shift of the monochromated beam is inevitable. Here we report performance tests of novel, asymmetrically cut, channel-cut crystals which reduce the beam movements by more than a factor of 20 relative to the symmetric case over the typical energy range of an EXAFS spectrum at the Cu K-edge. In addition, the presented formulas for the beam offset including the asymmetry angle directly indicate the importance of this value, which has been commonly neglected so far in the operation of double-crystal monochromators. International Union of Crystallography 2019-10-16 /pmc/articles/PMC6853379/ /pubmed/31721730 http://dx.doi.org/10.1107/S1600577519011123 Text en © Ronald Frahm et al. 2019 http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.http://creativecommons.org/licenses/by/4.0/
spellingShingle Research Papers
Frahm, Ronald
Diao, Qianshun
Murzin, Vadim
Bornmann, Benjamin
Lützenkirchen-Hecht, Dirk
Hong, Zhen
Li, Tang
Performance of nearly fixed offset asymmetric channel-cut crystals for X-ray monochromators
title Performance of nearly fixed offset asymmetric channel-cut crystals for X-ray monochromators
title_full Performance of nearly fixed offset asymmetric channel-cut crystals for X-ray monochromators
title_fullStr Performance of nearly fixed offset asymmetric channel-cut crystals for X-ray monochromators
title_full_unstemmed Performance of nearly fixed offset asymmetric channel-cut crystals for X-ray monochromators
title_short Performance of nearly fixed offset asymmetric channel-cut crystals for X-ray monochromators
title_sort performance of nearly fixed offset asymmetric channel-cut crystals for x-ray monochromators
topic Research Papers
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6853379/
https://www.ncbi.nlm.nih.gov/pubmed/31721730
http://dx.doi.org/10.1107/S1600577519011123
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