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Study on mutual interaction between high energy ion beams and carbon materials related to interstellar material

星际物质相关高能离子束与碳材料相互作用研究

基本信息

批准号：
06452098
负责人：
SUENO Shigeho
金额：
$ 4.86万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06452098/
关键词：
accelerator proton-beam phase transformation crystal defect carbon materials DLC (diamond like carbom)ion-beam irradiation diamond プロトンビ-DLc(diamond like carbon)プロトンビーム DLC(diamond like carbon)

项目摘要

This study was carried out using a newly designed "Temperature adjustable specimen irradiation chamber" installed on a beam line in the UTTAC (University of Tsukuba Tandem Accelerator Center). For the irradiation specimen, simple carbon materials such as graphite, coal, and synthetic and natural diamonds were firstly employed instead of interstellar dust like carbon materials such as PAH because of their simple structures. The specimens on a ladder like specimen holder were irradiated by proton beams of different energies and currents. During the experiments, luminescence was observed on the diamond specimens. We investigated this ion-luminescence of diamond caused by the proton beam bombardment as the part of this study, because there are very few reports on the ion-luminescence phenomena, and the luminescence is a very sensitive probe on the detection of the formation and alteration of the structural defect in crystal. The ion-luminescence spectra were taken at near the liquid nitrog … More en temperature and were compared with those of cathode luminescence spectra. The spectra were almost similar to those of cathode luminescence at the beginning, but several new peaks were observed at the late stage of the irradiation. The combination analysis of PIXE and the ion-luminescence will be an effective method for analyzing the species and the structures of impurities in the defect.The irradiated specimens were investigated by the optical methods such as FTIR,Raman spectrometry, ESCA,etc. As the results, although the break down of graphite structure to amorphous carbon, and the alteration growth from amorphous to graphite were observed, transformation to the diamond structure from other phases was not detected in this investigation. However, all the diamonds in meteorites and the diamond found in coal with high U content, which may be related with irradiation of cosmic-ray or radiation of U,are in Angstrom size, and it is conceivable that this transformation can be stabilized only in the Angstrom size. If diamond is Angstrom size, optical methods used in this study are not able to detect such a small size phases. We are now carrying out evacuation experiment of the graphite and amorphous phases in the irradiated carbon specimens using chlorine peroxide for concentrating the possible diamond phase occurred by the irradiation experiments. The residues of this evacuation experiments are observed by TEM and SEM.This observation is now on the way. We will continue this study and extend the specimen to other carbon materials such as PAH. Less

这项研究是使用安装在UTTAC（筑波大学串联加速器中心）光束线上的新设计的“温度可调样品辐照室”进行的。对于辐照样品，首先使用石墨、煤、合成和天然钻石等简单碳材料代替多环芳烃等星际尘埃碳材料，因为它们结构简单。类似梯子的样品架上的样品受到不同能量和电流的质子束的照射。在实验过程中，在金刚石样品上观察到发光。作为本研究的一部分，我们研究了质子束轰击引起的金刚石离子发光，因为关于离子发光现象的报道很少，而发光是检测晶体中结构缺陷的形成和变化的非常灵敏的探针。离子发光光谱是在接近液氮温度下获取的，并与阴极发光光谱进行比较。开始时的光谱与阴极发光的光谱几乎相似，但在照射后期观察到几个新的峰。 PIXE与离子发光的联合分析将成为分析缺陷中杂质的形态和结构的有效方法。采用FTIR、拉曼光谱、ESCA等光学方法对辐照后的样品进行了研究。结果，虽然观察到石墨结构分解为无定形碳，以及从无定形到石墨的蚀变生长，但在本研究中没有检测到从其他相到金刚石结构的转变。然而，陨石中的钻石和高铀含量煤中发现的钻石（可能与宇宙射线或铀辐射有关）都是埃尺寸，可以想象，这种转变只能稳定在埃尺寸。如果金刚石的尺寸为埃，则本研究中使用的光学方法无法检测如此小尺寸的相。我们现在正在使用过氧化氯对辐照碳样品中的石墨和非晶相进行抽空实验，以浓缩辐照实验中可能出现的金刚石相。通过 TEM 和 SEM 观察了此次抽空实验的残留物。此次观察正在进行中。我们将继续这项研究，并将样本扩展到其他碳材料，例如 PAH。较少的