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

1.我们开发了一种光谱设备，使我们能够获得原位近红外（NIR）光谱从一个小区域的praque矿物成像与NIR光学显微镜。使用铝镜将NIR输出光引入FTIR光谱仪（Perkin Elmer Spectrum 2000）的发射端口。目前的系统可以显示这种光学安排的可用性，但进一步的改进将强烈增加的灵敏度。研究了辉橄榄岩蚀变及其近红外光谱与Re-Os年龄的关系。辉钼矿在CaCl_2、AlCl_3、NaCl、NaHCO_3和H_2O等溶液中于180 ℃恒温20天后，其近红外透过率变化不大。在CaCl_2和AlCl_3的作用下，钙铝榴石发生了明显的变化，相反，钙铝榴石的某些部位的近红外光谱透明度增加。在这两种情况下，还发现，在ca. 3250 cm-3的带隙<-1>被移动到可见光和IR之间的边界区域，这表明钙钛矿的带隙增加。此外，还发现Re-Os体系的分馏作用与其近红外光谱的稳定性并不必然相关.分子水的OH伸缩+ HOH弯曲组合模式被发现是一个有希望的指示分子水在天然样品中的化学状态。在天然样品中，仅从OH伸缩谱带很难区分OH离子和分子水。在近红外区观察到的结合带完全来自分子水。我们观察到立方金刚石中水的结合带，并且带形的温度依赖性证明了其中一个样品中存在高压冰相。

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.