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Photo-induced Structural Change and the Relaxation in Liquid Sulfur

Research Project

Project/Area Number 07454066
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅰ(光物性・半導体・誘電体)
Research InstitutionHIROSHIMA UNIVERSITY

Principal Investigator

TAMURA Kozaburo  Hiroshima Univ., Fac.Integ.Arts & Sciences, Professor, 総合科学部, 教授 (30155262)

Co-Investigator(Kenkyū-buntansha) INUI Masanori  Hiroshima Univ., Fac.Integ.Arts & Sciences, Associate Professor, 総合科学部, 助教授 (40213136)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥500,000 (Direct Cost: ¥500,000)
Keywordsliquid sulfur / photo-induced polymerization / transient absorption spectra / photo-induced semiconductor-metal transition / 過度吸収スペクトル / 光誘起半導体一金属転移 / 鎖状高分子
Research Abstract

We have studied what happens in the structural and electronic properties of liquid chalcogens such as S and Se when we remove LP electrons by the photo-excitation.
It is well known that liquid S forms a light yellow liquid consisting of S_8 molecules, which has the shape of puckered ring, between the melting point (113゚C) and the polymerization temperature Tp (159゚C). We have found that liquid S is very photo-sensitive and a distinct photo-induced structural change occurs when the pulsed laser with a wave length of 355 nm illuminates below Tp. With increasing intensity of laser we have observed three different structural changes : (1) A charge transfer complex is produced when the intensity is less than 10 mJ/pulse. (2) A polymer is produced when the intensity is more than 10 mJ/pulse. (3) When the intensity is more than 20 mJ/pulse we have observed another interesting phenomena, namely, the illuminated region appears in the visible light like rainbow. Studies using a microscope revealed an inhomogeneous region where a giant-molecule seems to be generated. It was found, furthermore, that the two-dimensional restriction of the optical cell less than 0.1 micron in which liquid S is contained plays an important role when the giant-molecules are generated. The geometrical restriction may force the giant-molecules to have an ordered structure.
We have also found a strong photo-darkening for liquid Se, that is, an enormous reduction exceeding 50% in the transmittance when the pulsed laser with band gap energy illuminates. The results of the transient absorption spectra suggest the possibility that the illumination of laser induces the structural instability of liquid Se eventually causing the semiconductor-metal transition.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 坂口佳史: "液体イオウにおける光誘起重合化とその緩和" 広島大学総合科学部 紀要IV理系編. 第20巻. 131-152 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Sakaguchi: "Photo induced Polymerization & Relaxation in Liquid Sulphur" Journal of Physics : Condensed Matter. Vol.7. 4787-4801 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Sakaguchi: "Photo-induced Structural Changes in Liquid Sulfur" Journal of Non-Crystalline Solids. Vol 205-207. 115-119 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Tamura: "Semiconductor-metal Transition in Fluid Selenium" Proceedings of the First Chinese Conference on Liquid Physics,Beijing. in press. (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Sakaguchi: "Photo-induced Polymerization and the Relaxation in Liquid Sulfur" Memoirs of the Faculty of Integrated Arts and Scences, Hiroshima University, Ser.IV. Vol.20. 131-152 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Sakaguchi: "Photoinduced Polymerization and Relaxation in Liquid Sulphur" Journal of Physics : Condenced Matter. Vol.7. 4787-4801 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Y.Sakaguchi: "Photo-induced Structural Changes in Liquid Sulfur" Journal of Non-Crystalline Solids. Vol.205-207. 115-119 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Tamura: "Simiconductor-metal Transition in Fluid Selenium" Proceedings of the First Chinese Conference on Liquid Physics, Beijing. (in press). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 坂口佳史: "液体イオウにおける光誘起重合化とその緩和" 広島大学総合科学部紀要IV理系編. 第20巻. 131-152 (1994)

    • Related Report
      1996 Annual Research Report
  • [Publications] Y. Sakaguchi: "Photo induced Polymerization a Relaxation in Liquid Sulphur" Journal of Physics : Condersed Matter. Vol. 7. 4787-4801 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] Y. Sakaguchi: "Photo-induced Structural changes in Liquid Sulfur" Journal of Non-Crystalline Solids. vol. 205-207. 115-119 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] K. Tamura: "Semiconductor-metal Transition in Fluid Selenium" Proceedings of the First chinese Conference on Liguia physies, Beijing, 1996.(in press).

    • Related Report
      1996 Annual Research Report
  • [Publications] Y. Sakaguchi: "Photo induced polymerization and Relaxation in Liquid Sulphur" Journal of Physics: Condensod Matter. 7. 4787-4801 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Y. Sakaguchi: "Photo-induced Structural Changes in Liquia Sulfur" Journal of Non-Crystalline Solids. (in press).

    • Related Report
      1995 Annual Research Report

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Published: 1996-04-01   Modified: 2020-05-15  

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