Fundamental studies on the comparison between ultrafine particles produced in laboratory and grains produced in universe.

目前的实验表明，在实验室中产生的粒子的结构是解释空间观测光谱的关键。这些实验对发现金刚石、石墨、SiC、TiC、MoC、ZrC、Al_2O_3和Si_3N_4等前太阳颗粒的影响越来越大。由于这些材料具有非挥发性、多晶性和非晶性，使得结构的读取变得困难，这是漫射光谱的起源，在目前的工程中，尺寸、形状和缺陷对其影响很大。一些材料的光谱学已得到阐明。当颗粒尺寸减小时，原子的扩散方向发生改变（尺寸效应）。在SiC的生长过程中，很明显，即使在室温下，Si和碳也可以通过反应生成SiC。除了诉讼程序。《南极陨石论文集》，收录了这些报告的22篇论文和2篇投稿论文。对碳、金刚石、SiC、SiO、Al_2O_3、MgO等进行了分析。从目前的研究结果可以看出下一步研究的发展方向。

It becomes evident through out present experiments that the structure of particles produced in laboratory becomes key point to elucidate the spectra observed in space. These experiments are increasing interest for the shake of discovery of pre-solar grains such as diamond, graphite, SiC, TiC, MoC, ZrC, Al_2O_3 and Si_3N_4. Since these materials are non volatile, having polymorphism, and amorphous substance, the reading of the structure becomes difficult, which is the origin to diffuse the spectroscopy, In the present project, size, shape and defect effects on the. spectroscopy have been elucidated for some materials. If the size of the particles decreased, the directions of diffusion atom were changed (Size effect). In the growth of SiC, it becomes evident that SiC can be produced by the reaction between Si and carbon even at room temperature. In addition to proceedings .of grain formation work shops, Proceedings of Antactic meteorites, 22 papers and 2 submitted papers have been collected on these reports. Results on carbon, diamond, SiC, SiO, Al_2O_3, MgO are also contained. The next developing direction of research has been seen from the present results.