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Study of Superconductor Thin Film Growth and the manifestation Mechanism Using Super-Excited Atomic Oxygen (O^<****>) Beam

超激发原子氧(O^<****>)束超导薄膜生长及其表现机制研究

基本信息

批准号：
07559003
负责人：
INO Shozo
金额：
$ 4.16万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07559003/
关键词：
metastable atom oxigen oxide high-Tc superconductor thin film surface ultra-high vacuum reflection high-energy electron diffraction total reflection angle X-ray spectroscopy 反射高速電子回析全反射角X線分光

项目摘要

In 1996 we modified the metastable beam source made in last year, built mechanical chopper in differential vacuum chamber to pulse the metastable beam. We also built photomultiplier (ceratron) at 50 cm downstream of the chopper, to obtain time-of-flight (TOF) spectrum of the metastable beam by integrating the signal, with the gate signal of the chopper as trigger. The obtained TOF spectra showed that the velocity avarage of He^<**> beam is 3000 m/s, whereas the distribution of O^<**> beam has two peak at the velocity avarage of 2000 and 500 m/s. In addition, we observed fine structures of the O^<**> TOF spectrum. This indicates that the O^<**> beam consists of several O^<**>'s each of which has different energy, and there is a possibility to devide an O^<**> atoms with different energy by TOF method. This result needs further investigation with laser technique etc.We have tried to connect the metastable beam source via a differential chamber with an UHV chamber for the production of superconductive thin film. We noticed that it is difficult to maintain UHV on flowing the O^<**> beam. Hence, we connect a turbo molecular pump with the UHV chamber.Furthermore, we have demonstrated that N^<**> or O^<**> with different excitation energy from that by the above technique can be produced from nitrogen or carbon dioxide gas, and the best condition of the metastable beams are on investigation.

1996年我们对去年研制的亚稳束源进行了改造，在差压真空室中安装了机械斩波器，实现了亚稳束流的脉冲化。我们还在斩波器下游50 cm处建立了光电倍增管（ceratron），以斩波器的门信号作为触发，通过积分信号获得亚稳态光束的飞行时间（TOF）谱。结果表明，He^** 束的平均速度为3000 m/s，而O^** 束的平均速度为2000 m/s和500 m/s时出现两个峰值。此外，我们还观察到了O^** TOF谱的精细结构。这表明，O^**>束是由多个能量不同的O^**>原子组成的，用飞行时间方法分离不同能量的O^**>原子是可能的。这一结果还有待于用激光等技术作进一步的研究。我们曾尝试将亚稳束源通过差压室与超高真空室连接起来，以制备纳米薄膜。我们注意到，在流动O^<**>束时很难保持超高真空。为此，我们将涡轮分子泵与超高真空室相连，并证明了从氮气或二氧化碳气体中可以产生与上述技术不同激发能量的N^**>或O^**>，并探讨了产生亚稳态光束的最佳条件。