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Analysis of carbonaceous materials which show "217.5<plus-minus>2.5 nm hum

碳质材料分析显示“217.5<正负>2.5 nm 嗡嗡声”

基本信息

批准号：
05640305
负责人：
SAKATA Akira
金额：
$ 1.34万
依托单位：
Univ.of Electro-Communications
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05640305/
关键词：
interstellar dust carbonaceous dust carbonaceous material interstellar extinction curve mesophase pitch soot 220 nm absorption plasma 星間減光紫外スペクトル炭素質微粒子微粒子散乱

项目摘要

Interstellar extinction curve is a spectrum of interstellar dust in our Galaxy. In the spectrum we can see a clear 217.5 nm hump and and very broad-500 nm hump.QCC (Quenched Carbonaceous Composite) is an amorphous carbonaceous material formed from a hydrocarbon plasma. In a previous paper (Sakata et al.1994), we have studied two forms of QCC : a dark QCC component located near the plasmic beam and a thermally-altered filmy QCC.Both types of QCC derivatives show an absorption feature near 217 nm but with different extinction magnitude. And we showed that soots produced from methane, methane-hydrogen gas mixtures, have a broad extinction feature centered at about 217 nm.In this work we present a new material, mesophase pitch, which has a 217 nm extinction feature. The mesophase pitch was produced from raw pitch by heating to -450 C,by Asahi Coke Ltd. Chemical analysis of the mesophase pithc showed H/C=0.52.These three kinds of materials showing about 217 nm hump were formed under hydrogen rich environment. From the chemical composition of mesophase pitch, we can deduce that the carbonaceous materials having 217 nm feature contain a large amount of hydrogen in their structure.

星际消光曲线是我们银河系中星际尘埃的光谱。在光谱中，我们可以看到一个清晰的217.5 nm峰和一个非常宽的500 nm峰。QCC（淬火碳质复合材料）是一种由碳氢化合物等离子体形成的无定形碳质材料。在之前的一篇论文（Sakata et al.1994）中，我们研究了两种形式的QCC：位于等离子束附近的暗QCC组件和热改变的薄膜QCC。两种QCC衍生物在217 nm附近均有吸收，但消光幅度不同。我们发现，由甲烷，甲烷-氢气混合物产生的煤烟，在217纳米处有广泛的消光特征。在这项工作中，我们提出了一种新的材料，中间相沥青，具有217纳米消光特性。中间相沥青由原沥青加热至-450℃，由朝日焦炭有限公司生产。化学分析表明，H/C=0.52。这三种材料都是在富氢环境下形成的，峰长约217 nm。从中间相沥青的化学组成可以推断出217 nm特征的碳质材料结构中含有大量的氢。