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

Research Project

Project/Area Number 01540279
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 固体物性
Research InstitutionTokyo Metropolitan University

Principal Investigator

HANYU Takaaki  Tokyo Metropolitan Univ. Dept. of Physics Professor, 理学部, 教授 (30087093)

Co-Investigator(Kenkyū-buntansha) ISHII Hiroyoshi  Tokyo Metropolitan Univ. Dept. of Physics Research Assistant, 理学部, 助手 (90128562)
Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1990: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1989: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsMonochromator / 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
Research Abstract

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

Report

(3 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 石井 広義 等: "XーRay Photoemission Spectroscopy of Nl_<2ーx>Ce_xCuO_<4ーy> and La_<2ーx>Sr_xCuO_4" Jpn.J.Appl.Phys.28. L1952-L1954 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 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)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 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)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T. Hanyu et al.: "Electronic Structures of Metallic CeFe_2, CeRh_2 and CeOs_2 Compounds Studied by Resonant Photoelectron Spectroscopy" State Commun.(1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 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)

    • Related Report
      1990 Annual Research Report
  • [Publications] 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)

    • Related Report
      1990 Annual Research Report
  • [Publications] T.Hanyu: "An Electron Gum for Bremstrahlung Isochromat Spectroscopy" Jpn.J.Apl.Phys. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] T.Hanyu: "Bremstrahlumg Isochromat Spectroscopy of Ce MeTal Compounds" J.Phys.Soc.Jpn. (1990)

    • Related Report
      1989 Annual Research Report

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Published: 1989-04-01   Modified: 2016-04-21  

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