Electronic Structures of Metallic Cerium Compounds Studied By Photoelectron Spectroscopy and Bremsstrahlung Isochromat Spectroscopy

光电子能谱和轫致辐射等色能谱研究金属铈化合物的电子结构

• 批准号: 01540279
• 负责人: HANYU Takaaki
• 金额: $ 1.15万
• 依托单位: Tokyo Metropolitan University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01540279/
• 关键词: Monochromator; PES; Electron gun; Kondo resonance state; BIS; Density of states; Electron lens; Dense kondo alloy; 逆光電子分光; 光電子分光; 近藤合金; 電子状態

The construction of a combined spectrometer has been planned in order to obtain the information about the electronic structures just below the Fermi level for metallic cerium compounds. This apparatus consists of a photoelectron spectrometer (PES) and a bremsstrahlung isochromat spectrometer (BIS). Of this apparatus the PES has been completed and has been well operated. In this time it is to design and construct the BIS. This consists of the monochromator for AlK alpha radiation and the electron gun system for excitation. Firstly, the monochromator has been designed, in which some quartz plates are used for monochromatization of radiation from samples. In order to collect the radiation as much as possible, a multi-bent quartz crystals has been designed. A radius of the bent quartz crystal is 400 mm. The system of adjustment for position of the crystals has been constructed ; for the movement and inclination of the samples.Next, we have designed an electron gun. For the determination of … More the design, the computer program for calculating an electron trajectory has been researched and developed. Based on the ray-tracing, a lens system has been so determined as to be suitable for BIS. The final design of the electron lens consists of a part of electron emission gun and three-cylindrical electrode lens for focusing electron beam and acceleration of electrons. The specification of the electron gun system is as follows ; (1) Acceleration of voltage for electron can be varied from 10 to 1,500 eV, (2) The focal spot size on sample is less than 2 mm phi , and (3) The current of electron beam can be obtained as much as possible. It is very difficult to realize the third specification, because the emission source must be warmed too high for obtaining the high beam current. Then, the vacuum of the chamber including the electron gun grows worse because of the high beam. The consideration for this dilemma is important for designing the electron gun ; The limit of the beam current occurred.The electron gun and quartz monochromator are to be assembled in the chamber having a vacuum of less than of 1 x 10^<-10> Torr, and the combined spectrometer is scheduled to be complete for measuring the density of states in the occupied and empty bands of the materials concerning to 4f electrons. Less

为了获得金属铈化合物费米能级以下的电子结构信息，计划建造一台组合光谱仪。该装置由光电子能谱仪（PES）和韧致辐射等色谱仪（BIS）组成。该装置的PES已经完成，并已运行良好。在这段时间里，它是设计和建造的BIS。这包括用于AlK α辐射的单色器和用于激发的电子枪系统。首先，设计了单色器，其中一些石英片用于单色化样品的辐射。为了尽可能多地收集辐射，设计了多弯石英晶体。弯曲石英晶体的半径为400 mm。已经构建了晶体位置调节系统;用于样品的移动和倾斜。接下来，我们设计了电子枪。的测定 ...更多信息 设计，研究和开发了计算电子轨迹的计算机程序。在光线追迹的基础上，确定了适合于BIS的透镜系统。最终设计的电子透镜由一部分电子发射枪和三圆柱电极透镜组成，用于聚焦电子束和加速电子。电子枪系统的规格如下：（1）电子的电压加速度可在10至1，500 eV之间变化，（2）样品上的焦斑尺寸小于2 mm phi，（3）电子束的电流可尽可能多地获得。实现第三种规格是非常困难的，因为为了获得高的电子束电流，发射源必须被加热得太高。然后，包括电子枪的腔室的真空由于高光束而变差。电子枪和石英单色器将被组装在真空度小于1 × 10 ~（-3）Torr的真空室中<-10>，并计划完成组合谱仪，用于测量与4f电子有关的材料的占据带和空带的态密度。少

项目成果

石井 広義 等: "XーRay Photoemission Spectroscopy of Nd_<2ーχ>ーCeχCuO_<4ーy> and La_<2ーχ>Sr_χCuO_4" Jpn.J.Appl,Phys.28. L1952-L1954 (1989)

Hiroyoshi Ishii 等：“Nd_<2-χ>-CeχCuO_<4-y> 和 La_<2-χ>Sr_χCuO_4 的 X 射线光电发射光谱”Jpn.J.Appl，Phys.28（1989 年）。 ）

H. Ishii et al.: "X-Ray Photoemission Spectroscopy of Nd_<2-x>Ce_xCu0_<4-x> and La_<2-x>Sr_xCu0_4" Jpn. J. Appl. Phys.28. 1952-l1954 (1989)

H. Ishii 等：“Nd_<2-x>Ce_xCu0_<4-x> 和 La_<2-x>Sr_xCu0_4 的 X 射线光发射光谱”Jpn。

羽生 隆昭 等: "Electronic Structures of Metallic CeFe_2,CeRh_2 and CeOs_2 Compounds Studied by Resonant Photemission Spectroscopy." Sobiol State Commun.(1991)

Takaaki Hanyu 等人：“通过共振光发射光谱研究金属 CeFe_2、CeRh_2 和 CeOs_2 化合物的电子结构。”(1991)

羽生 隆昭 等: "Electronic Structures of Metellic CeFe_2,CeRh_2 and CeOs_2 Compounds Studied by Resonant Photoemission Spectroscopy." Solid State Commun.(1991)

Takaaki Hanyu 等人：“通过共振光电发射光谱研究金属 CeFe_2、CeRh_2 和 CeOs_2 化合物的电子结构。”(1991)

T.Hanyu: "Bremstrahlumg Isochromat Spectroscopy of Ce MeTal Compounds" J.Phys.Soc.Jpn. (1990)

T.Hanyu：“Ce MeTal 化合物的轫致等色光谱”J.Phys.Soc.Jpn。