High Energy Spectroscopy in f and d Electron Systems

f 和 d 电子系统中的高能谱

基本信息

批准号：
05044040
负责人：
KOTANI Akio
金额：
$ 2.88万
依托单位：
Institute for Solid State Physics, University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
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/grant/KAKENHI-PROJECT-05044040/
关键词：
High energy spectroscopy X-ray Absorption Photoelectron emission Rare erath Transition metal compounds Multiplet Valence mixing Auger relaxation 稀土類

项目摘要

The purpose of this project is to develop both theoretical and experimental studies of "high energy spectroscopy", such as X-ray absorption spectroscopy (XAS) and X-ray photoemission spectroscoppy (XPS), by the collaboration of representative Japanese and European researchers. The main results of the joint research are as follows :1. For shallow core levels of heavy rare-earths and transition elements, it is revealed that the lifetime of final states of XPS has a strong multiplet-term-dependence. By this finding, long-standing problems in the interpretation of rare-earths 4d XPS and transition element 3p XPS are resolved (contributors : Kotani, Okada, Thole and Sawatzky).2. The effect of the term-dependent lifetime mentioned above is also important in X-ray emission spectroscopy (XES). Both theoretical and experimental studies along this line is now in progress (Kotani, Tanaka, Parlebas and Shin).3. Systemetic study of electronic states of light transition-metal oxides has been performed by analysing XPS and XAS data. The existence of very strong covalency hybridization between transition element 3d and oxygen 2p is pointed out (Kotani, Okada, Shin, Palebas and Steiner).4. Anomalously strong valence-mixing is found from the analysis of XAS and XPS of CePd_7. At the same time, the surface Ce ion in CePd_7 is in the trivalent state (Kotani, Parlebas, Shin and Fujimori).5. Tre high spin-low spin transition in LaCoO_3 is studied by XAS and XPS.Theoretical analyzes by a cluster model and a band model are also performed (Fujimori, Abbate and Sawatzky).6. On magnetic X-ray dichroism in XAS of ferromagnetic materials, the exchange of new information has been made (Jo, van der Laan, Thole and Carra).

该项目的目的是通过代表性的日本和欧洲研究人员的合作，共同开发“高能量光谱”（例如X射线吸收光谱（XAS）和X射线光发射光谱（XP））的理论和实验研究。联合研究的主要结果如下：1。对于重稀土和过渡元素的浅核心水平，据揭示了XPS最终状态的寿命具有强大的多重依赖性。通过这一发现，解决了稀土4D XPS和过渡元素3P XP的长期问题（贡献者：Kotani，Kotani，Okada，Thole和Sawatzky）.2。上述术语依赖性寿命的影响在X射线发射光谱（XES）中也很重要。沿这条线的理论和实验研究现在正在进行中（田中，田中，帕雷巴斯和辛恩）。3。通过分析XPS和XAS数据，已经对光过渡金属氧化物的电子状态进行了系统研究。指出了过渡元件3D和氧2p之间非常强的共价杂交（Kotani，Okada，Shin，Palebas和Steiner）。4。从CEPD_7的XAS和XPS分析中可以发现异常强的价值混合。同时，CEPD_7中的表面CE离子处于三价状态（Kotani，Parlebas，Shin和Fujimori）。5。通过XAS和XP研究了Lacoo_3中的高自旋 - 低自旋跃迁。还通过群集模型进行了理论分析，并且还进行了频带模型（Fujimori，Abbate和Sawatzky）。6。关于铁磁材料XA的磁性X射线二色性，已经进行了新信息的交换（Jo，van der Laan，Thole和Carra）。