Volume 10, No.1

目次 / Table of Contents

January issue 2005

新年ご挨拶
New Year’s Greeting

吉良　爽　KIRA Akira

放射光利用研究促進機構（財）高輝度光科学研究センター　理事長　Organization for the Promotion of Synchrotron Radiation Research, President of JASRI

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1. SPring-8の現状／PRESENT STATUS OF SPring-8

「長期利用2003A採択課題中間評価」について
Intermediate Evaluation of 2003A Long-term Proposal

（財）高輝度光科学研究センター　利用業務部　User Administration Division, JASRI

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ユーザーニーズに関するWebアンケートの結果
On the Questionnaire Survey to the SPring-8 Users

(財)高輝度光科学研究センター　企画室　Planning Office, JASRI

Pages 4 - 6 Download PDF (41.51 KB)

SPring-8運転・利用状況
SPring-8 Operational News

（財）高輝度光科学研究センター　研究調整部　Research Coordination Division, JASRI

Pages 7 - 8 Download PDF (14.04 KB)

論文発表の現状
Publications Resulting from Experiments at SPring-8

（財）高輝度光科学研究センター　利用業務部　User Administration Division, JASRI

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プレス発表の状況（2004年10月〜11月）
Press Releases (October-November, 2004)

（財）高輝度光科学研究センター　広報室　Public Relations Office, JASRI

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最近SPring-8から輩出された成果リスト
List of Recent Publications

（財）高輝度光科学研究センター　利用業務部　User Administration Division, JASRI

Pages 11 - 16 Download PDF (37.09 KB)

2. 最近の研究から／FROM LATEST RESEARCH

元素選択磁化測定による有機分子被覆金ナノ微粒子の強磁性の観測
Direct Observation of Ferromagnetic Spin Polarization in Au Nanoparticles by Element Specific Magnetization Measurement

山本　良之　YAMAMOTO Yoshiyuki、堀　秀信　HORI Hidenobu

北陸先端科学技術大学院大学　材料科学研究科　School of Materials Science, Japan Advanced Institute of Science and Technology

Abstract: Gold shows diamagnetic property in the bulk state. However, this property might be different in the nano-sized region because the electronic structure may be modified significantly. This article reports the first direct observation of ferromagnetic spin polarization of Au nanoparticles with a mean diameter of 1.9 nm using X-ray magnetic circular dichroism (XMCD). Owing to the element selectivity of XMCD, only the gold magnetization is explored. Magnetization of gold atoms estimated by XMCD shows a good agreement with the results obtained by conventional magnetometry. This result is evidence of intrinsic spin polarization in nano-sized gold.

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多孔性配位高分子のナノ細孔に吸着した水素分子の直接観測
Direct observation of hydrogen molecules adsorbed in a microporous coordination polymer

久保田　佳基　KUBOTA Yoshiki^[1]、高田　昌樹　TAKATA Masaki^[2]、北川　進　KITAGAWA Susumu^[3]、加藤　健一　KATO Kenichi^[4]、小林　達生　KOBAYASHI Tatsuo^[5]、坂田　誠　SAKATA Makoto^[6]

^[1]大阪女子大学　理学部　Department of Environmental Sciences, Osaka Women’s University、^[2]（財）高輝度光科学研究センター　利用研究促進部門Ⅰ／CREST (JST)　Materials Science Division, JASRI / CREST、^[3]京都大学大学院　工学研究科　Department of Synthetic Chemistry and Biological Chemistry, Kyoto University、^[4]（財）高輝度光科学研究センター　利用研究促進部門Ⅰ／CREST (JST)、Materials Science Division, JASRI / CREST、^[5]岡山大学　理学部　Department of Physics, Okayama University、^[6]名古屋大学大学院　工学研究科　Department of Applied Physics, Nagoya University

Abstract: Hydrogen storage is one of the most important technologies, which is indispensable for the establishment of clean hydrogen energy system. Adsorption of H₂ molecules in the metal-organic porous materials is one of the most promising candidates to store and release H₂ molecules efficiently. To develop a rational synthetic strategy for novel metal-organic porous materials as hydrogen storages, the elucidation of the intermolecular interaction between H₂ molecules and pore walls is essential and the fundamental structural characteristics of H₂ molecules are required. Although the weakest X-ray scattering amplitude of hydrogen made it difficult to determine the structure, we have succeeded in direct observation of H₂ molecules adsorbed in the nano-channels of the metal-organic porous material by in-situ synchrotron powder diffraction experiment of gas adsorption and MEM(maximum entropy method)/Rietveld analysis. The result could give us promising guidelines for designing hydrogen gas storage materials.