Ghent University Academic Bibliography

Advanced

Polycapillary based µ-XAS and confocal µ-XANES at a bending magnet source of the ESRF

Geert Silversmit UGent, Bart Vekemans UGent, Sergey Nikitenko, Kristof Tirez, Wim Bras, Frank E Brenker and Laszlo Vincze UGent (2009) JOURNAL OF PHYSICS CONFERENCE SERIES. In Journal of Physics Conference Series 190.
abstract
Glass polycapillary optics are shown to be easy to use focusing optics for bending magnet XAS stations. These achromatic optics have acceptances of several mm horizontally and vertically, while their angular acceptances can be matched to the source divergence by the design of the polycapillary. A polycapillary half-lens based focusing system was successfully tested for transmission and fluorescence µ-XAS at the DUBBLE beamline (BM26A, ESRF) and the feasibility of confocal µ-XANES in fluorescence mode is presented. Transmission efficiencies of 25-45% with flux density gain factors of about 2000 and beam sizes of 10-20 µm were obtained in the 7-14 keV energy range. Although the polycapillary optic has a smoothly changing energy dependent transmission efficiency, the amplitude and shape of the EXAFS oscillations are not influenced by this. The focusing properties of the polycapillary lens cancel slight vertical motions of the incoming X-ray beam, resulting in a fixed µ-beam spot in the focal plane, making polycapillaries also suitable optic in combination with a non-fixed exit monochromator. In addition, by mounting a second polycapillary half-lens in front of an energy dispersive detector, a confocal set-up is obtained, which restricts the part of the sample seen by the detector to a microscopic volume of about 20×20×15 µm3 at the Fe K absorption edge for example.
Please use this url to cite or link to this publication:
author
organization
alternative title
Polycapillary based mu-XAS and confocal mu-XANES at a bending magnet source of the ESRF
year
type
conference
publication status
published
subject
keyword
polycapillary, confocal µ-XANES, X-RAY ABSORPTION FINE-STRUCTURE
in
JOURNAL OF PHYSICS CONFERENCE SERIES
J. Phys. Conf. Ser.
editor
A Di Cicco and A Filipponi
series title
Journal of Physics Conference Series
volume
190
issue title
14TH INTERNATIONAL CONFERENCE ON X-RAY ABSORPTION FINE STRUCTURE (XAFS14), PROCEEDINGS
pages
6 pages
publisher
IOP Publishing
place of publication
Bristol, UK
conference name
14th International conference on X-Ray Absorption Fine Structure (XAFS14)
conference location
Camerino, Italy
conference start
2009-07-26
conference end
2009-07-31
Web of Science type
Proceedings Paper
Web of Science id
000275152100037
ISSN
1742-6588
DOI
10.1088/1742-6596/190/1/012036
language
English
UGent publication?
yes
classification
P1
additional info
article no. 012036 (6 p.)
copyright statement
I have transferred the copyright for this publication to the publisher
id
967353
handle
http://hdl.handle.net/1854/LU-967353
date created
2010-06-01 13:09:50
date last changed
2010-06-29 11:55:06
@inproceedings{967353,
  abstract     = {Glass polycapillary optics are shown to be easy to use focusing optics for bending magnet XAS stations. These achromatic optics have acceptances of several mm horizontally and vertically, while their angular acceptances can be matched to the source divergence by the design of the polycapillary. A polycapillary half-lens based focusing system was successfully tested for transmission and fluorescence {\textmu}-XAS at the DUBBLE beamline (BM26A, ESRF) and the feasibility of confocal {\textmu}-XANES in fluorescence mode is presented.
Transmission efficiencies of 25-45\% with flux density gain factors of about 2000 and beam sizes of 10-20 {\textmu}m were obtained in the 7-14 keV energy range. Although the polycapillary optic has a smoothly changing energy dependent transmission efficiency, the amplitude and shape of the EXAFS oscillations are not influenced by this. The focusing properties of the polycapillary lens cancel slight vertical motions of the incoming X-ray beam, resulting in a fixed {\textmu}-beam spot in the focal plane, making polycapillaries also suitable optic in combination with a non-fixed exit monochromator.
In addition, by mounting a second polycapillary half-lens in front of an energy dispersive detector, a confocal set-up is obtained, which restricts the part of the sample seen by the detector to a microscopic volume of about 20{\texttimes}20{\texttimes}15 {\textmu}m3 at the Fe K absorption edge for example.},
  author       = {Silversmit, Geert and Vekemans, Bart and Nikitenko, Sergey and Tirez, Kristof and Bras, Wim and Brenker, Frank E and Vincze, Laszlo},
  booktitle    = {JOURNAL OF PHYSICS CONFERENCE SERIES},
  editor       = {Di Cicco, A and Filipponi, A},
  issn         = {1742-6588},
  keyword      = {polycapillary,confocal {\textmu}-XANES,X-RAY ABSORPTION FINE-STRUCTURE},
  language     = {eng},
  location     = {Camerino, Italy},
  pages        = {6},
  publisher    = {IOP Publishing},
  title        = {Polycapillary based {\textmu}-XAS and confocal {\textmu}-XANES at a bending magnet source of the ESRF},
  url          = {http://dx.doi.org/10.1088/1742-6596/190/1/012036},
  volume       = {190},
  year         = {2009},
}

Chicago
Silversmit, Geert, Bart Vekemans, Sergey Nikitenko, Kristof Tirez, Wim Bras, Frank E Brenker, and Laszlo Vincze. 2009. “Polycapillary Based µ-XAS and Confocal µ-XANES at a Bending Magnet Source of the ESRF.” In Journal of Physics Conference Series, ed. A Di Cicco and A Filipponi. Vol. 190. Bristol, UK: IOP Publishing.
APA
Silversmit, G., Vekemans, B., Nikitenko, S., Tirez, K., Bras, W., Brenker, F. E., & Vincze, L. (2009). Polycapillary based µ-XAS and confocal µ-XANES at a bending magnet source of the ESRF. In A. Di Cicco & A. Filipponi (Eds.), JOURNAL OF PHYSICS CONFERENCE SERIES (Vol. 190). Presented at the 14th International conference on X-Ray Absorption Fine Structure (XAFS14), Bristol, UK: IOP Publishing.
Vancouver
1.
Silversmit G, Vekemans B, Nikitenko S, Tirez K, Bras W, Brenker FE, et al. Polycapillary based µ-XAS and confocal µ-XANES at a bending magnet source of the ESRF. In: Di Cicco A, Filipponi A, editors. JOURNAL OF PHYSICS CONFERENCE SERIES. Bristol, UK: IOP Publishing; 2009.
MLA
Silversmit, Geert, Bart Vekemans, Sergey Nikitenko, et al. “Polycapillary Based µ-XAS and Confocal µ-XANES at a Bending Magnet Source of the ESRF.” Journal of Physics Conference Series. Ed. A Di Cicco & A Filipponi. Vol. 190. Bristol, UK: IOP Publishing, 2009. Print.