| Project/Area Number |
09555019
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Applied physics, general
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| Research Institution | The University of Tokyo |
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Principal Investigator |
AMEMIYA Yoshiyuki Dept. of Advanced Materials Science, The Univ. of Tokyo, Professor, 大学院・新領域創成科学研究科, 教授 (70151131)
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| Co-Investigator(Kenkyū-buntansha) |
長谷川 祐司 東京大学, 大学院・工学系研究科, 助手 (60282498)
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥13,500,000 (Direct Cost: ¥13,500,000)
Fiscal Year 1999: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1998: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1997: ¥9,900,000 (Direct Cost: ¥9,900,000)
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| Keywords | X-ray polarization microscopy / synchrotron radiation / X-ray detector / X-ray polarimeter / x-ray dichroism / 偏光顕微鏡 / 空間分解能 / 高分解能X線検出器 |
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| Research Abstract |
The purpose of this study is to develop an x-ray polarization microscopy which enables us to observe images of polarization contrast due to linear dichroism (LD) and circular dichroism (CD) in x-ray spectral range. This method can be applied to the observation of anisotropy of materials in x-ray energy range. This study consists of (1) Development of high resolution CCD x-ray detector, (2) Observation of x-ray images of polarization contrast due to x-ray linear dichroism (XLD), and (3) Observation of x-ray images of polarization contrast due to x-ray magnetic circular dichroism (XMCD)
(1) The critical element of the high resolution CCD x-ray detector is a phosphor screen to convert x-rays to visible light. The conversion efficiency, non-uniformity of response and spatial resolution of the phosphor have been optimized by choosing phosphor materials, thicknesses, deposition methods, substrate materials. As a result, GdィイD22ィエD2OィイD22ィエD2S:Tb(P-43) with a 10 micron thickness has been chosen. When the CCD x-ray detector with this phosphor is combined with an x-ray magnifier made of Si 111 asymmetric crystal, this imaging system has shown a spatial resolution of 1.2 micron.
(2) Images of polarization contrast due to x-ray linear dichroism (XLD) has been successfully observed with cobalt single crystal at K-edge (7709 eV). It is the fist time that the polarization-contrast image due to XLD is observed in hard x-ray range.
(3) Images of polarization contrast due to x-ray magnetic circular dichroism (XMCD) has been successfully observed with cobalt poly-crystals at K-edge (7709 eV).
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