Sample-angle feedback for diffraction anomalous fine-structure spectroscopy

Diffraction anomalous fine‐structure (DAFS) experiments measure Bragg peak intensities as continuous functions of photon energy near a core‐level excitation. Measuring the integrated intensity at each energy makes the experiments prohibitively slow; however, in many cases DAFS can be collected quick...

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Bibliographic Details
Published in:Journal of synchrotron radiation 1998-05, Vol.5 (3), p.911-913
Main Authors: Cross, J. O., Elam, W. T., Harris, V. G., Kirkland, J. P., Bouldin, C. E., Sorensen, L. B.
Format: Article
Language:English
Subjects:
anomalous scattering
diffraction anomalous fine structure
sample-angle feedback
XAFS
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Summary:Diffraction anomalous fine‐structure (DAFS) experiments measure Bragg peak intensities as continuous functions of photon energy near a core‐level excitation. Measuring the integrated intensity at each energy makes the experiments prohibitively slow; however, in many cases DAFS can be collected quickly by measuring only the peak intensity at the center of the rocking curve. A piezoelectric‐actuator‐driven stage has been designed and tested as part of a sample‐angle feedback circuit for locking onto the maximum of the rocking curve while the energy is scanned. Although software peak‐tracking requires only a simple calculation of diffractometer angles, it is found that the additional hardware feedback dramatically improves the reproducibility of the data.
ISSN:1600-5775
0909-0495
1600-5775
DOI:10.1107/S0909049597014313