Development of Near Infrared Microspectroscopy and its Application to Spectroscopic Study on Opaque Minerals.

近红外显微光谱学的发展及其在不透明矿物光谱研究中的应用。

• 批准号: 07554081
• 负责人: SUZUKI Katsuhiko
• 金额: $ 0.77万
• 依托单位: The University of Tokyo (1996)University of Tsukuba (1995)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07554081/
• 关键词: Opaque Minerals; Near Infrared Microscopy; Molybdenite; Rhenium-Osmium Age; FTIR; Water; Hydrogen Bonding; 近赤外; 顕微鏡; 鉱物; 赤外スペクトル

1. We developed a spectroscopic equipment which enables us to obtain in-situ near infrared (NIR) spectra from a small region of praque minerals imaged with an NIR optical microscope. NIR output light was intyroduced to an emission port of FTIR spectrometer (Perkin Elmer Spectrum 2000) using aluminum mirrors. The present system can show the availability of this optical arrangement, but further improvement will intensively increase in the sensitivity.2. Relationship between molybdenite alteration, and its NIR spectrum and Re-Os age was investigated. Molybdenite was altered at 180 ﾟC for 20 days in various solutions, such as CaCl_2, AlCl_3, NaCl, NaHCO_3 and H_2O.In the latter three cases, little changes could be found in NIR transparency. IN molybdenites altered in CaCl_2 and AlCl_3, on the contrary, increase in transparency of NIR in some parts of molybdenites was observed. In these two cases, it was also found that the absorption edges observed in ca. 3250 cm^<-1> were moved to the boundary region between visible and IR, which indicates increase in band gap of molybdenite. Incidentally, it was found that fractionation in Re-Os system is not necessarily associated with its NIR transparency.3. The OH stretching + HOH bending combination mode of molecular water was found to be a promising indication for the chemical state of molecular water in natural samples. In natural samples, it is fairly difficult to distinguish between OH ion and molecular water only from OH stretching band. The combination band observed in NIR region is exclusively from molecular water. We observed the combination band of water in cubic diamonds, and the temperature dependence of band shape demonstrated the presence of high pressure phase of ice in one of the samples.

1. 我们开发了一种光谱设备，使我们能够从用 NIR 光学显微镜成像的一小块区域获得原位近红外 (NIR) 光谱，并将 NIR 输出光引入 FTIR 光谱仪 (Perkin Elmer) 的发射端口。 Spectrum 2000）使用铝镜，目前的系统可以显示这种光学装置的可用性，但进一步的改进将大大提高灵敏度。2．研究了辉钼矿在CaCl_2、AlCl_3、NaCl、NaHCO_3和H_2O等不同溶液中在180℃下20天的蚀变，并研究了其近红外光谱和Re-Os年龄。在后三种情况下，变化很小。发现辉钼矿在NIR中的透明度发生了改变，在CaCl_2和AlCl_3中相反，在NIR中透明度增加。在这两种情况下，在辉钼矿的某些部分中观察到，在约3250cm^-1处观察到的吸收边移动到可见光和红外光之间的边界区域，这表明带隙增加。顺便说一句，我们发现Re-Os体系中的分馏与其近红外透明度不一定相关。3．分子水的OH拉伸+HOH弯曲组合模式被认为是该化学物质的一个有希望的指示。天然样品中分子水的状态在天然样品中，仅通过 OH 伸缩带很难区分 OH 离子和分子水，在近红外区域观察到的组合带完全来自水分子的组合带。在立方钻石中，带形状的温度依赖性表明其中一个样品中存在冰的高压相。

项目成果

Agata, T: "Ilvaite from a serpentinized peridotite in the Asama igneous complex, Mikabu greenstone belt, Sambagawa metamorphic terrain, central Japan" Mineral.Mag.59. 489-496 (1996)

Agata, T：“来自日本中部三波川变质地形 Mikabu 绿岩带浅间火成岩杂岩中蛇纹石橄榄岩的伊尔瓦石”Mineral.Mag.59。

Price, W: "A Pulsed Field Gradient NMR Study of the Aggregation and Hydration of Parvalbumin" Biophys.Chem.(in press). (1997)

Price, W：“小清蛋白聚集和水合的脉冲场梯度 NMR 研究”Biophys.Chem.（出版中）。

Katsuhiko Suzuki: "Re-Os dating of molybdenites from ore deposits in Japan:Implication for the closure temperature of the Re-Os system for molybdenite and the cooling history of molybdenum ore deposits." Geochimica et Cosmochimica Acta. 60. 3151-3159 (199

Katsuhiko Suzuki：“日本矿床辉钼矿 Re-Os 定年：对辉钼矿 Re-Os 系统闭合温度和钼矿床冷却历史的影响。”

鍵 裕之: "天然ダイヤモンドの生成過程を化学の目で考える" 化学と工業. 49. 163-166 (1996)

Hiroyuki Kagi：“从化学角度考虑天然钻石的生产过程”《化学与工业》49. 163-166 (1996)。

Li W.: "A two stage method for growing a large crystal of diamond with high quality." J.Crystal Growth. 160. 78-86 (1996)

Li W.：“一种用于生长高质量大金刚石晶体的两阶段方法。”