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Research for the origin of an interstellar 220 nm bump

星际 220 nm 凸块起源研究

基本信息

批准号：
11440063
负责人：
WADA Setsuko
金额：
$ 9.02万
依托单位：
The University of Electro-Communications
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

We made carbonaceous materials from a hydrocarbon plasma. The type collected in the plasmic beam is a carbonaceous material named dark-QCC and the type collected on a wall of the vacuum chamber is an organic condensate named filmy-QCC. The dark-QCC showed : an absorption peak which is very similar to the interstellar 220nm-UV-bump.We analyzed the structure of both QCCs and discussed about dusts in astronomical sources. In order to investigate the interstellar processing of dusts, we made an apparatus in which, we could make various experiments, for examples, irradiation of UV and H atoms on dust analogues. By irradiation experiment of hydrogen plasma to the dark-QCC, we observed that methylene structure was formed in it.To clarify the alteration of carbonaceous dusts by shock wave heating, we heated the QCCs thermally and measured their infrared spectra. By heating, the filmy-QCC was converted into a carbonaceous material. The spherules with onion-like structure appeared in it. We discussed infrared spectral variations around AGB stars in various evolved stages. On the I other hand, by heating of the dark-QCC, micro diamond appeared in it. We discussed about j formation process of micro diamonds in meteorites.We checked the measurement of infrared spectra of the filmy-QCC with polarizer. The ] results showed that the condensate is an anisotropic material.

我们用碳氢化合物等离子体制造了碳质材料。在等离子体束中收集的类型是被称为暗QCC的碳质材料，并且在真空室的壁上收集的类型是被称为薄膜QCC的有机冷凝物。暗-QCC显示：我们分析了这两个QCC的结构，并讨论了天文源中的尘埃。为了研究尘埃的星际过程，我们制作了一个装置，可以在其中进行各种实验，例如，紫外线和H原子对尘埃类似物的照射。通过氢等离子体对暗QCC的辐照实验，观察到QCC中有亚甲基结构的形成。为了弄清激波加热对碳质粉尘的影响，我们对QCC进行了热加热，并测量了它们的红外光谱。通过加热，膜状QCC转化为碳质材料。讨论了不同演化阶段AGB星周围红外光谱的变化。另一方面，通过加热暗QCC，在其中出现了微金刚石，讨论了陨石中微金刚石的形成过程，并用偏振器对薄膜QCC的红外光谱进行了测试。结果表明，凝聚体是一种各向异性材料。