Author: "Tanida H" / Topic: extended x-ray absorption fine structure - Searchworks@Jio Institute Digital Library Search Results

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Start Over Author "Tanida H" Topic extended x-ray absorption fine structure

Author: Uruga, T., Tanida, H., Inoue, K., Yamazaki, H., and Irie, T.
Subjects: *EXTENDED X-ray absorption fine structure, *X-rays, *ELECTROMAGNETIC waves, *RADIATION, *MONOCHROMATORS
Abstract: A time-resolved quick x-ray absorption fine structure (QXAFS) system was designed and constructed using high flux but low power quasimonochromatic undulator radiation at a helical undulator beamline, BL40XU at SPring-8. At 12 keV, a flux of 1013 – 1014 photons/sec/0.1 % bw. was generated over an energy range of 1 keV with a total power of 7 – 15 W. A compact Si(111) channel cut monochromator having no active cooling was utilized. The monochromator was mounted on a galvano-scanner stage within an experimental hutch. The stage could be oscillated at frequencies up to 100 Hz over a 1.4-degree range. The Pt L3-edge(11.6 keV) EXAFS spectra of Pt foil was measured in transmission and fluorescence modes up to k = 15 A-1 in a period of 50 ms/scan. In this report, the design of the QXAFS system and some preliminary experimental results are presented. © 2007 American Institute of Physics [ABSTRACT FROM AUTHOR]
Published: 2007
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Author: Kolobov, A. V., Fons, P., Krbal, M., Simpson, R. E., Hosokawa, S., Uruga, T., Tanida, H., and Tominaga, J.
Subjects: EXTENDED X-ray absorption fine structure, GERMANIUM, LIQUID phase epitaxy, SEMICONDUCTORS, PHYSICS
Abstract: We report on x-ray absorption studies of the structure of the liquid phase of a prototypical phase-change material Ge2Sb2Te5. We demonstrate that the local structure of liquid Ge2Sb2Te5 is very similar to that of amorphous Ge2Sb2Te5. Ge atoms in the liquid phase are found to be covalently bonded suggesting a semiconducting nature of the melt. [ABSTRACT FROM AUTHOR]
Published: 2009
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Author: Funasaka, K., Tojo, T., Katahira, K., Shinya, M., Miyazaki, T., Kamiura, T., Yamamoto, O., Moriwaki, H., Tanida, H., and Takaoka, M.
Subjects: *PARTICULATE matter, *LEAD & the environment, *ATMOSPHERIC deposition, *AIR sampling apparatus, *CHEMICAL speciation, *X-ray absorption near edge structure, *EXTENDED X-ray absorption fine structure, *URBAN pollution
Abstract: Pb-LIII edge XANES spectra of atmospheric particles are directly obtained by fluorescent XAFS spectroscopy using a 19-element solid state detector (SSD). Particulate sample was collected on a quartz fiber filter using a high-volume air sampler, and the filter was cut into small pieces (25×25 mm). Then, surface layer of the filter piece was scaled and accumulated in order to enhance the particle density per filter unit. Use of 10 pieces of the surface layer enables the measurement of Pb-LIII edge XANES spectra on beamline BL01B1 at SPring-8, Hyogo, Japan. The shape of the Pb-LIII edge XANES spectra of the particulate sample is similar to the shapes of the spectra for PbS, PbCO3, PbSO4 and/or PbCl2. Additionally, the filter sample is also divided into water-soluble, 0.1 M HCl-extractable, and residual fractions of Pb compounds by a simple acid extraction procedure. We discuss the possibility of Pb speciation in the particulate samples with combination of highly sensitive XANES spectroscopy and simple acid extraction. [Copyright &y& Elsevier]
Published: 2008
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