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High resolution photoelectron spectroscopy of organic conducting materials

有机导电材料的高分辨率光电子能谱

基本信息

批准号：
14540529
负责人：
HINO Shojun
金额：
$ 2.37万
依托单位：
Chiba University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

In order to clarify the electronic structure change around the superconductive and non superconductive phase transition temperature of organic materials, a sample holding system of a ultrahigh resolution photoelectron spectrometer was modified. After the modification, temperature of the sample holder stem went down to less than 10 K which was the aim of modification, but the sample disk itself was not cold enough to investigate the phase transition. Another modification is under the way. Parallel to the modification, photoelectron spectra of metallofullerenes and linear carbon chain molecules have been measured. Metallofullerenes consist of fullerene cages and metal atoms and metal atoms donate electron the cage. Electronic structures of metallofullerenes change drastically according to the amounts of transferred electrons and their spin states. We have clarified the electronic structures of three Tm@C82 isomers and a Pr@C82 minor isomer. We found that two electrons are transferred to the cage in Tm@C82, whereas three electrons are transferred in Pr@C82. Linear carbon chain molecules are considered to be one of prospective candidates for molecular wire. We found that the longer the chain, the less stable the highest occupied molecular orbit and these molecules can be treated as a good example of one-dimensional quantum well.

为了研究有机材料在相变温度附近和非相变温度附近的电子结构变化，对高分辨光电子能谱仪的样品固定系统进行了改进。改进后，样品保持器杆的温度下降到低于10 K，这是改进的目的，但样品盘本身不够冷，无法研究相变。另一项修改正在进行中。与此同时，测量了金属富勒烯和线性碳链分子的光电子能谱。金属富勒烯由富勒烯笼和金属原子组成，金属原子为笼提供电子。金属富勒烯的电子结构随电子转移量和自旋态的变化而发生剧烈的变化。我们已经澄清了三个Tm@C82异构体和Pr@C82次要异构体的电子结构。我们发现，两个电子转移到笼在Tm@C82，而三个电子转移在Pr@C82。线性碳链分子被认为是分子导线的潜在候选者之一。我们发现，链越长，分子最高占据轨道越不稳定，这些分子可以作为一维量子阱的一个很好的例子。