SYNTHESIS OF THE SI-C FINE GRAINS HAVING 11 MICRONS BROAD FEATURE.

在我们的银河10<micrn>米宽的圆形恒星尘埃中，可以观察到圆形恒星的O-富星星信封，11<micrn>米宽的恒星信封中，可以观察到C-富星星信封中。这1100<micrn>个任务是由si-c dusts引起的。它很难直接从硅-C分子或基本材料中产生硅-C粉尘。我们假定硅-C尘埃形成了一种含有硅-C和硅-分子和基础设施的混合物。我们尝试形成Si-C尘埃作为后续步骤;在我们形成快速冷却的冷凝物形成Si-C分子光束，在第二步我们从Si-C基质和含有C分子和基础物的混合物中形成Si-C颗粒。SiO_2 + Si的混合物在1，300 ° C时从Ta船上的电加热中射出。SiO-gas是用四极质谱仪检测到的。快速冷却的SiOcondensates were obtained and analyzed with X ray differometer and electron spin resonance （ESR） apparatus。X射线分析显示，他们有玻璃的硅-O和ESR测量结构，表明他们没有固定的电子。它们是化学活性极高的。They were classified to two types; One was a condensate from SiO molecule gas called "Molecule Frost" and the other condensate was formed from dense SiO gas called "Cluster Frost"。当分子霜冻和簇霜冻加热到400 ° C时，用红外光谱测量发现了其结构的变化。They reacted with H_2O easily at-200 c。使用Sio-condenses，我们将在nect step生产Si-C粉尘。

In our galaxy 10 <micrn> m broad spectra of the circumstellar dust are observed in circumstellar envelopes of o-rich stars and 11<micrn> m broad spectra are observed in envelopes of C-rich stars. These 11 <micrn> m emission are thought to be caused by si-c dusts. It is difficult to form directly Si-C dusts from Si-C molecules or radicals artificially. We assumed that the Si-C dusts are formed form a mixture of SiO and C-containing molecules and radicals. We try to form Si-C dusts as follows; in first step we form rapidly cooled condensates form SiO molecular beam and in second step we form Si-C grains from a mixture of the SiO condensates and the C-containing molecules and radicals. SiO molecular beam was ejected from the mixture of SiO_2 + Si in Ta boat by electrical heating at 1,300 ゜c. SiO gas was detected with quadrupole massspectrometer. Rapidly cooled SiO condensates were obtained and analyzed with X ray diffractometer and electron spin resonance (ESR) apparatus. X ray analysis showed that they have glassy structre of Si-O and ESR measurement shows that they have unpaired electrons. They were highly active chemically. They were classified to two types; One was a condensate from SiO molecule gas called "Molecule Frost" and the other condensate was formed from dense SiO gas called "Cluster Frost". When Molecule Frost and Cluster Frost were heated to 400 ゜c , change of their structure were found with IR spectra measurements. They reacted with H_2O easily at -200 ゜c. Using the SiO condensates we will produce Si-C dusts in nect step.