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Proceedings Paper

X-ray optics for modulation spectroscopy
Author(s): Motohiro Suzuki; N. Kawamura; Tetsuya Ishikawa
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Paper Abstract

This paper reports new techniques for hard x-ray modulation spectroscopy, helicity modulation and energy modulation, which have been developed at SPring-8. The helicity modulation technique has been realized by combination of fast helicity switching at 40 Hz using a transmission diamond x-ray phase retarder and a phase-sensitive (lock-in) detection system. Performance of the helicity modulation technique is demonstrated by measured spectra of x-ray magnetic circular dichroism of extremely high signal-to-noise ratio in the region near the Fe K-edge. A quick and precise method for the polarization tuning is presented, and the helicity modulation technique is shown to be applicable to magnetic EXAFS spectroscopies in wider energy region. For the energy modulation technique, fast energy switching has been made using a Si channel-cut crystal as a second monochromator of high energy resolution. An energy-derivative XAFS spectrum was directly obtained at the Mn K-edge, and illustrates the advantages of this technique in high energy resolution and noise reduction.

Paper Details

Date Published: 5 January 2001
PDF: 10 pages
Proc. SPIE 4145, Advances in X-Ray Optics, (5 January 2001); doi: 10.1117/12.411630
Show Author Affiliations
Motohiro Suzuki, SPring-8/Japan Synchrotron Radiation Research Institute (Japan)
N. Kawamura, SPring-8/RIKEN-The Institute of Physical and Chemical Research (Japan)
Tetsuya Ishikawa, SPring-8/Japan Synchrotron Radiation Research and RIKEN-The Institute of Physical and Chem (Japan)

Published in SPIE Proceedings Vol. 4145:
Advances in X-Ray Optics
Alan G. Michette; Andreas K. Freund; Tetsuya Ishikawa; Sebastian Oestreich; Derrick C. Mancini; Ali M. Khounsary; Derrick C. Mancini; Alan G. Michette; Sebastian Oestreich, Editor(s)

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