Author: "Tanida H" / Topic: monochromators - Searchworks@Jio Institute Digital Library Search Results

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Start Over Author "Tanida H" Topic monochromators

Author: Terada, Y., Tanida, H., Uruga, T., Takeuchi, A., Suzuki, Y., and Goto, S.
Subjects: *OPTICAL resolution, *BEAMFORMING, *OPTICAL reflection, *TRACE element analysis, *X-ray microscopes, *MEASUREMENT, *MONOCHROMATORS
Abstract: An x-ray microprobe system with total-reflection mirror optics for trace element analysis has been developed at beamline 37XU of SPring-8. To achieve sub-microprobe, a spatial filter has been installed downstream of a monochromator. Focusing tests have been performed in the x-ray energy range of 6-14 keV. A focused beam size of 0.83 μm(V)×1.35 μm(H) has been obtained at an x-ray energy of 10 keV, and using a spatial filter in the horizontal direction, the beam size is down to 0.84 μm. Micro-x-ray absorption fine structure (XAFS) spectroscopy of submicrometer particles has been done by utilizing the total-reflection mirror optics. It was clearly observed from the nickel K-edge XAFS spectra that the oxidation state of nickel was a mixture of metal and oxide even in the single submicrometer particle. [ABSTRACT FROM AUTHOR]
Published: 2011
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Author: Nonaka, T., Dohmae, K., Araki, T., Hayashi, Y., Hirose, Y., Uruga, T., Yamazaki, H., Mochizuki, T., Tanida, H., and Goto, S.
Subjects: X-ray spectroscopy, MONOCHROMATORS, SYNCHROTRONS, WIGGLER magnets, LIQUID nitrogen, DATA quality, OSCILLATIONS
Abstract: We have developed a quick-scanning x-ray absorption fine structure (QXAFS) system and installed it at the recently constructed synchrotron radiation beamline BL33XU at the SPring-8. Rapid acquisition of high-quality QXAFS data was realized by combining a servo-motor-driven Si channel-cut monochromator with a tapered undulator. Two tandemly aligned monochromators with channel-cut Si(111) and Si(220) crystals covered energy ranges of 4.0-28.2 keV and 6.6-46.0 keV, respectively. The system allows the users to adjust instantly the energy ranges of scans, the starting angles of oscillations, and the frequencies. The channel-cut crystals are cooled with liquid nitrogen to enable them to withstand the high heat load from the undulator radiation. Deformation of the reflecting planes is reduced by clamping each crystal with two cooling blocks. Performance tests at the Cu K-edge demonstrated sufficiently high data quality for x-ray absorption near-edge structure and extended x-ray absorption fine-structure analyses with temporal resolutions of up to 10 and 25 ms, respectively. [ABSTRACT FROM AUTHOR]
Published: 2012
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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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