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First X-Ray Microprobe and Microspectroscopy Results From The Gsecars Sector At The Advanced Photon Source

Published online by Cambridge University Press:  02 July 2020

Mark L. Rivers ,
Stephen R. Sutton ,
Peter Eng  and
Matthew Newville
Mark L. Rivers
Affiliation:
Center for Advanced Radiation Sources, University of Chicago, Chicago, IL, 60637
Stephen R. Sutton
Affiliation:
Center for Advanced Radiation Sources, University of Chicago, Chicago, IL, 60637
Peter Eng
Affiliation:
Center for Advanced Radiation Sources, University of Chicago, Chicago, IL, 60637
Matthew Newville
Affiliation:
Center for Advanced Radiation Sources, University of Chicago, Chicago, IL, 60637
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The Advanced Photon Source (APS) at Argonne National Laboratory is a third-generation synchrotron x-ray source, optimized for producing x-rays from undulators. Such undulator sources provide extremely bright, quasi-monochromatic radiation which is ideal for an x-ray microprobe. Such microprobes can be used for trace element quantification with x-ray fluorescence, or for chemical state determination with x-ray absorption spectroscopy. The GeoSoilEnviroCARS (GSECARS) sector at the APS is building an x-ray microprobe for research in earth, planetary, soil and environmental sciences.

The GSECARS undulator source is a standard APS Undulator “A” which is a 3.3 cm period device with 72 periods. The energies of the undulator peaks can be varied by adjusting the gap, and hence the magnetic field of the undulator. The energy of the first harmonic can be varied in this way from approximately 3.1 keV to 14 keV. A measured undulator spectrum is shown in Figure 1.

Type
Quantitative Biological and Materials Microanalysis by Electrons and X-Rays
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 905 - 906
Copyright
Copyright © Microscopy Society of America 1997

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