Studies on infrared spectral reflectances of minerals and meteorites.

1.为了<maicro>更好地了解小行星表面的矿物组合，我们使用傅里叶变换红外分光光度计（JASCO FT/IR-3）测量了矿物和陨石的漫红外反射率（2.53-25 m）.开发了红外光谱数据处理程序，包括绘制光谱曲线的程序. C2碳质球粒陨石材料可以通过水化带的深度在3和6 m左右与C3碳质球粒陨石材料区分开来<maicro>。这使我们能够更好地了解C-型小行星的矿物组合。顽火辉石球粒陨石材料在大于约9米的波长处显示出许多吸收带<maicro>，而铁陨石材料在25米以下没有显示出任何吸收带<maicro>。这一结果为我们提供了关于M型小行星表面组成的信息。细颗粒材料决定了漫反射中的光谱特征。6.我们推测，小行星16 Psyche的表面成分是顽火辉石类组合，而不是铁陨石类组合的基础上，10米左右的光谱特征<maicro>。我们需要对小行星进行高质量的红外测量。

1. We measured diffuse infrared reflectances (2.53-25 <maicro> m) of minerals and meteorites by using a Fourier transform infrared spectrophotometer (JASCO FT/IR-3) to better understand the surface mineral assemblage of asteroids.2. We developed some programs to process infrared spectral data including a program to draw spectral curves.3. C2 carbonaceous chondrite materials can be distinguished from C3 carbonaceous chondrite materials by the depth of the hydration bands around 3 and 6 <maicro> m. This enable us to better understand the mineral assemblage of C-type asteroids.4. Enstatite chondrite materials show many absorption bands at the wavelength longer than about 9 <maicro> m whereas iron meteorite materials do not show any absorption bands up to 25 <maicro> m. This result gives us information on the surface composition of M-type asteroids.5. Fine-grained materials determine the spectral features seen in diffuse reflectances.6. We speculate that the surface composition of asteroid 16 Psyche is the enstatite chondrite-like assemblage, not the iron meteorite-like assemblage on the basis of spectral features around 10 <maicro> m.7. We need infrared measurements of high enough quality of asteroids.