Energy Dispersive XAFS in the High Energy Region at BL14B1 in SPring-8

Journal Article · Fri Jan 19 04:00:00 EST 2007 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2436287· OSTI ID:21049246

Okajima, Yuka ^[1]; Matsumura, Daiju; Nishihata, Yasuo; Konishi, Hiroyuki; Mizuki, Jun'ichiro ^[1]

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1. Japan Atomic Energy Agency (JAEA), 1-1-1 Koto, Sayo-cho, Sayo-gun, Hyogo, 679-5148 (Japan)

An energy dispersive XAFS (DXAFS) system has been constructed in the second optics hutch at BL14B1 in SPring-8. The system is composed of dispersive optics with a position sensitive detector and is distinguished by covering energy region as high as 80 keV. Below 40 keV, two plane mirrors were utilized in optics to eliminate higher order harmonics and to focus X-rays vertically by mechanically-bent devices. The X-rays diffracted by a polychromator have an energy band width of 0.5 {approx} 1.5 keV, and its spectrum is measured by a CCD camera. Time-resolved XANES spectra were detected near the La K-edge (38.934 keV) with the exposure time of 200 msec during reduction of LaCoO3 at 600 deg. C. The energy resolution of DXAFS spectra near the La K-edge is as good as the conventional XAFS spectrum, and changing the valence state of La was observed during the decomposition process clearly. The Pt K-edge (78.395 keV) DXAFS spectra for a Pt foil, was observed by summing 100 sets of spectrum whose each exposure time is 500 msec. An EXAFS oscillation was extracted up to wavenumber k = 14 Aa-1.

• OSTI ID: 21049246
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 879; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ABSORPTION SPECTROSCOPY
CAMERAS
CHARGE-COUPLED DEVICES
DECOMPOSITION
ENERGY RESOLUTION
FINE STRUCTURE
FOILS
KEV RANGE
POSITION SENSITIVE DETECTORS
SPRING-8 STORAGE RING
TIME RESOLUTION
X RADIATION
X-RAY SPECTRA
X-RAY SPECTROSCOPY