日時 平成19年10月9日（火曜日）15時30分から
場所 九州大学理学研究科化学第3講義室
〒812-8581 福岡市東区箱崎6丁目10番1号
http://www.scc.kyushu-u.ac.jp/index.php
問合せ 九州大学理学研究院化学部門 前田米藏
参加費 無料
In situ Spectroscopy on Mars — NASA Rovers with Mainz Spectrometers Find Evidence for Water
(Johannes Gutenberg-Universität Mainz) Prof. Philipp Gütlich
The miniaturisation of a Mössbauer spectrometer, initiated by Egbert Kankeleit in the early nineties at the Technical University of Darmstadt and further developed and brought to completion at the Institute of Inorganic Chemistry of the University of Mainz, has led to an instrument which is scaled down by a factor of ca. 100 in size and weight as compared to a standard laboratory spectrometer. The miniaturised Mössbauer spectrometer (MIMOS) was chosen by the European Space Agency (ESA) and by NASA to participate in the Mars missions launched in 2003. The two NASA missions with the Mars exploration rovers (MER) “Spirit” and “Opportunity” on board landed successfully in opposite locations of the red planet Mars in January 2004. MIMOS has been functioning extremely well since then. It has recorded hundreds of Mössbauer spectra of fantastic quality, equivalent to those recorded in the laboratory, and sent to earth (JPL, Pasadena) for data reduction and spectral analysis. Many minerals such as Olivine, Pyroxene, Magnetite, Hematite and, most significantly, Jarosite have been identified by their characteristic hyperfine parameters. Jarosite, a basic sulphate mineral known to grow in wet sulphuric acidic surroundings like volcanic outcrops, turned out to be one of the most exciting discoveries as it evidences the occurrence of water on Mars. These findings have been supported by measurements with an Alpha Particle X-ray Spectrometer (APXS) developed at the Max Planck Institute of Chemistry in Mainz.
Two reports on the current Mars exploration have recently appeared in SCIENCE [1,2]. This journal has chosen the results of the Mars exploration as “breakthrough of the year 2004".
[1] Mineralogy at Gusev crater from the Mössbauer spectrometer on the Spirit rover. R. V. Morris, G. Klingelhöfer, B. Bernhardt, C. Schröder, D. S. Rodionov, P. A. de Souza, A. Yen, R. Gellert, E. N. Evlanov, J. Foh, E. Kankeleit, P. Gütlich, D. W. Ming, F. Renz, T. Wdowiak, S. W. Squyres, R. E. Arvidson
Science; 305(5685) (2004) 833-836.
[2] Jarosite and Hematite at Meridiani Planum from Opportunity's Mössbauer Spectrometer. G. Klingelhöfer, R. V. Morris, B. Bernhardt, C. Schröder, D. S. Rodionov, P. A. de Souza, A. Yen, R. Gellert, E. N. Evlanov, B. Zubkov, J. Foh, U. Bonnes, E. Kankeleit, P. Gütlich, D. W. Ming, F. Renz, T. Wdowiak, S. W. Squyres, R. E. Arvidson
Science 306 (2004) 1740-1745.
Nearly a dozen publications on results of these NASA Mars missions have appeared up to now in Science and Nature.
日時 平成19年10月1日（月曜日） 15時30分から17時
場所 東京大学工学部11号館1階講堂
地図 http://www.u-tokyo.ac.jp/campusmap/cam01_04_12_j.html
住所 〒113-8656 東京都文京区本郷7-3-1
問合せ 野村貴美 03-5841-7499
参加費 無料
Applications of Mössbauer Spectroscopy in Molecular Magnetism
(Johannes Gutenberg-Universität Mainz) Prof. Philipp Gütlich
Research on molecular magnetism with all its fascinating facets like spin crossover, intramolecular magnetic interactions, valence tautomerism, mixed valency has gained increasing interest in recent years among chemists as well as physicists. Among the various techniques that are commonly employed to study the magnetic properties like magnetochemical and magnetic resonance methods, thermodynamic measurements, X-ray and neutron diffraction techniques, the tools using synchrotron radiation is also Mössbauer spectroscopy which, particularly for iron containing substances, has developed to an extremely powerful technique. The hyperfine interactions that can be extracted from a Mössbauer spectrum yields information on electronic and molecular structure, valence state and magnetic properties. This will be demonstrated in the lecture on selected examples exhibiting
-thermal spin crossover in mononuclear iron coordination compounds,
-light-induced creation of long-lived metastable spin states (LIESST effect),
-spin crossover under applied pressure,
-interplay of spin crossover and antiferromagnetic coupling in dinuclear iron complexes,
-mixed-valency, transition between “trapped” and “delocalized” states,
-ferromagnetic coupling in large-spin clusters,
-electron transfer, magnetic transition and photomagnetism in Prussian Blue analogue systems.
Suggested reading may found in:
[1] P.Gütlich, A. Hauser, and H. Spiering, Angew. Chem.Int. Ed. Engl., 1994, 33, 2024; P. Gütlich, A. Hauser, H. Spiering in: Inorganic Electronic Structure and Spectrosocopy Vol. II, A.B.P. Lever, E.I. Solomon eds., John Wiley & Sons, 1999, 575; P. Gütlich, Y. Garcia, H. Spiering, in: “Magnetism: Molecules to Materials IV", J.S. Miller, M. Drillon (eds.), Wiley-VCH, Weinheim/Germany, 2003.
[2] P. Gütlich, H.A. Goodwin (eds.), “Spin Crossover in Transition Metal Compounds”, Topics in Current Chemistry, Volumes 233, 234, 235, Springer, Heidelberg, Berlin, 2004.
[3] J.S. Miller, M. Drillon (eds.), “Magnetism: Molecules to Materials”, and subsequent volumes I I, III, IV, Wiley-VCH, Weinheim/Germany
[4] V. Ksenofontov, G. Levchenko, S. Reiman, P. Gütlich, A. Bleuzen, V. Escax and M. Verdaguer, Phys. Rev. B 2003, 68, 2, art. no.-024415.
日時 平成18年10月17日(火曜日) 15時から17時15分
場所 東京大学工学部11号館1階講堂
地図 http://www.u-tokyo.ac.jp/campusmap/cam01_04_12_j.html
住所 郵便番号113-8656 東京都文京区本郷7-3-1
問合せ 野村貴美 03-5841-7499
参加費 無料
Nuclear Probes for strain analysis in ultra-thin silicide layers
(Catholic University of Leuven, Belgium) Prof. Guido Langouche
Langouche教授が10/10～11/2の間、理研における57Mnインビーム・メスバ ウアー分光実験に参加のため、JSPS短期フェローとして日本に滞在します。Langouche教授は、不安定核のインプランテーション実験を通じたHyperfine Interactionに関する物性研究の第一人者で、ベルギーのルーバン大学の低エネルギーイオン注入装置をはじめCERN ISOLDEなどで発光メスバウアー分光やチャネリング実験を精力的に行い、多くの業績を上げています。また、雑誌「Hyperfine Interactions」のChief Editor、メスバウアー分光研究に関する国際委員、理研加速器施設国際評価委員（物性研究担当）、ルーバン大学副学長（2004まで）などを務め活躍されています。今回の講演では、ヨーロッパにおける不安定核を利用した物性研究についてメスバウアー分光法を中心に最新の話題を提供していただきます。
小林義男（理研・旭応用原子核物理研究室）
57Fe Moessbauer spectroscopic studies of nanocrystalline iron oxides and iron doped tin dioxides
Prof. Cesar Barrero (University of Antioquia, Colombia)
Barrero助教授は、ベルギーのGhent大学において1997年にAl置換ゲーサイトのメスバウアー分光研究でPh. Dを取得し、本年６月から11月末までの半年間、松前国際財団のfellowsとして日本に滞在しています。これまでフランスのMaine大学やアルゼンチンのCentro Nacional de Energia Atomicaで客員研究員として活躍し、メスバウアー分光法により研究を進めている材料科学、固体物理の新進気鋭の若手研究者です。今回の講演では、ナノマテリアルとしての鉄酸化物から希薄磁性酸化物半導体のメスバウアー分光法による解析について研究紹介をしていただきます。
野村貴美（東京大学大学院工学系研究科）
会期 平成16年11月1日
会場 上智大学
Moessbauer Mineralogy of Solids and Rocks at Meridiani Planum and Gusev Crater on Mars and Its Implications on the History of Water on Mars
（Inst. for Inorg. and Anal. Chem., Johannes Gutenberg-Univ.） Goestar Klingelhoefer
Copyright(C): 2007 Japan Mössbauer Spectroscopy Forum