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Development of apparatus for x-ray absorption spectroscopy of free clusters.

Research Project

Project/Area Number 12554013
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field 物理学一般
Research InstitutionKyoto University

Principal Investigator

YAO Makoto  Graduate School of Science, KYOTO UNIVERSITY, Assistant Professor, 大学院・理学研究科, 助教授 (70182293)

Co-Investigator(Kenkyū-buntansha) ISHII Masashi  Japan Synchrotron Radiation Research Institute, researcher, 放射光研究所, 研究員 (90281667)
NAGAYA Kiyonobu  Graduate School of Science, KYOTO UNIVERSITY, Instructor, 大学院・理学研究科, 助手 (30273436)
Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥13,800,000 (Direct Cost: ¥13,800,000)
Fiscal Year 2001: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2000: ¥11,500,000 (Direct Cost: ¥11,500,000)
Keywordscluster / X-ray absorption spectroscopy / de-excitation process / size selective
Research Abstract

We have developed a new apparatus for X-ray absorption spectroscopy of free clusters and a new method for size selective EXAFS measurement of free clusters.
The new apparatus mainly consists of two vacuum chambers, vacuum pumping system and cluster source. Each vacuum chamber is independently evacuated by turbo molecular pump to achieve enough pumping speed required for producing large clusters. In addition, we have developed a new cluster source which produces a cluster beam by an adiabatic expansion of gas or gas mixture into a vacuum chamber. The sample gas is ejected from the interchangeable nozzle which is mounted on top of a continuous flow cryostat. The nozzle temperature can be adjusted to values between 77 to 300 K and kept constant with an accuracy of ±1K when the cryostat is operated with liquid nitrogen. The performance of the apparatus have been evaluated by producing large argon clusters (up to Ar_<20> clusters are detected under typical condition).
We have suggested a new … More method for size selective EXAFS measurement of free clusters by using the information of de-excitation process of clusters subsequent to the x-ray absorption. In order to examine our suggestion, we have developed a new data acquisition system for EXAFS-PEPICO synchronous measurement and carried out EXAFS-PEPICO synchronous measurements for Se cluster beam at the X-ray undulator beamline BL10XU in SPring-8. Although the number density of Se atoms in the cluster beam is smaller than that of bulk Se samples by more than ten orders of magnitude, the X- ray absorption spectrum which has been taken by total ion yield (TIY) mode indicates clear EXAFS oscillation. The partial ion yield (PIY) spectra which are obtained by integrating the peaks of the PEPICO spectra also show clear EXAFS oscillation. We have deduced EXAFS spectra of Se_2 and "Se_5" clusters according to the size selective EXAFS method. The EXAFS oscillation of "Se_5" differs from that of Se_2 in characteristic manner and the spacing of the EXAFS oscillation clearly demonstrates that the bond length of "Se_5" is longer than that of Se_2. More precisely, the former proves to be 2.35A and the latter 2.16A, which is fully consistent with a pile of EXAFS data for various forms of Se. Therefore, we may conclude that the proposed size-selective XAFS is a reliable and realistic method. Less

Report

(3 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • Research Products

    (23 results)

All Other

All Publications (23 results)

  • [Publications] Kiyonobu.Nagaya et al.: "Photoelectron spectroscopy of small tellurium clusters"Journal Non-cryst. Solids.. (印刷中). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Makoto Yao et al.: "A new method for the size-selective EXAFS of neutral free clusters"Journal of Synchrotron Radiation. 8. 542-544 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Tetsuichiro Hayakawa et al.: "Photoelectron Photoion Coincidence Measurements of Selenium Cluster Beam II. Photon Energy Dependence"Journal of the Physical Society of Japan. 69. 2850-2858 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Tetsuichiro Hayakawa et al.: "Photoelectron Photoion Coincidence Measurements of Selenium Cluster Beam I. Evidence for the Coulomb Expansion"Journal of the Physical Society of Japan. 69. 2039-2048 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Makoto Yao et al.: "Anomalous Sound Attenuation in Liquid Te5OSe5O Mixture under High Pressure :"J. Phys. Condensed Matter. 12. 7323-7339 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ayano Chiba, Makoto Yao et al.: "Quasielastic Neutron Scattering of Liquid Te5OSe5O in the Semiconductor-to-Metal Transition Range"Journal of the Physical Society of Japan. 71-2(印刷中). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 八尾 誠: "新しいクラスターの科学 第8章"講談社(印刷中). (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Kiyonobu. Nagaya et al.: "Photoelectron spectroscopy of small tellurium clusters"Journal Non-cryst. Solids. (in press). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Makoto Yao et al.: "A new method for the size-selective EXAFS of natural free clusters"J. Synchrotron Rad. 8. 542-544 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Tetuichiro Hayakawa et al.: "Photoelectron Photoion Coincidence Measurements of Selenium Cluster Beam II. Poton Energy Dependence"J. Phys. Soc. Jpn. 69. 2850-2858 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Tetuichiro Hayakawa et al.: "Photoelectron Photoion Coincidence Measurements of Selenium Cluster Beam I. Evidence for the Coulomb Expansion"J. Phys. Soc. Jpn. 69. 2039-2048 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Makoto Yao et al.: "Anomalous Sound Attenuation in Liquid Te50Se50 Mixture under High Pressure :"J. Phys. Condensed Matter. 12. 7323-7339 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Ayano Chiba, Makoto Yao et al.: "Quasielastic Neutron Scattering of Liquid Te50Se50 in the Semiconductor-to-Metal Transition Range"J. Phys. Soc. Jpn. 71-2 (in press). (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Kiyonobu, Nagaya et al.: "Photoelectron spectroscopy of small tellurium clusters"Journal Non-cryst. Solids.. (印刷中). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] Makoto Yao et al.: "A new method for the size-selective EXAFS of neutral clusters"Journal of Synchrotron Radiation. 8. 542-544 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Tetsuichiro Hayakawa et al.: "Photoelectron Photoion Coincidence Measurements of Selenium Cluster Beam II. Photon Energy Dependence"Journal of the Physical Society of Japan. 69. 2850-2858 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] Tetsuichiro Hayakawa et al.: "Photoelectron Photoion Coincidence Measurements of Selenium Cluster Beam I. Evidence for the Coulomb Expansion"Journal of the Physical Society of Japan. 69. 2039-2048 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] Makoto Yao et al.: "Anomalous Sound Attenuation in Liquid Te50Se50 Mixture under High Pressure :"J. Phys. Condensed Matter. 12. 7323-7339 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] Ayano Chiba, Makoto Yao et al.: "Quasielastic Neutron Scattering of Liquid Te50Se50 in the Semiconductor-to-Metal Transition Range,"Journal of the Physical Society of Japan. 71-2(印刷中). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] 八尾 誠: "新しいクラスターの科学 第8章"講談社(印刷中). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] Makoto Yao et.al.: "A new method for the size-selective EXAFS of neutral free clusters"Journal of Synchrotron Radiation. 8. 542-544 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Tetsuichiro Hayakawa et.al.: "Photoelectron Photoion Coincidence Measurements of Selenium Cluster Beam II.Photon Energy Dependence"Journal of the Physical Society of Japan. 69. 2850-2858 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Tetsuichiro Hayakawa et.al.: "Photoelectron Photoion Coincidence Measurements of Selenium Cluster Beam I.Evidence for the Coulomb Expansion"Journal of the Physical Society of Japan. 69. 2039-2048 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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