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Reconsideration of atomic scattering factor for ultrafast electron diffraction

Research Project

Project/Area Number 26790049
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Thin film/Surface and interfacial physical properties
Research InstitutionHokkaido University

Principal Investigator

Naruse Nobuyasu  北海道大学, 高等教育推進機構, 特任助教 (30350408)

Project Period (FY) 2014-04-01 – 2016-03-31
Project Status Completed (Fiscal Year 2015)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywords超高速時間分解電子顕微鏡 / 光励起物性 / 貴金属 / 溶融過程 / 相対論的電子パルス / 原子間ポテンシャル / 原子散乱因子 / レーザー光 / 超高速時間分解電子回折法 / 金属 / 光誘起構造相転移 / 電子回折法 / 光物性 / 非平衡格子系動力学 / 非平衡溶融
Outline of Final Research Achievements

When a strong laser light is concentrated to matters, a melting occurs. The melting has been considered to be the effect of heat by the laser absorption (thermal melting). Recently, some papers have reported that the melting in the case of semiconductors occurs much earlier than believed thermal melting. The reason is explained below: the melting is promoted by the excited electrons, in the material atoms, which led to the weakened binding with atoms (non-thermal melting). It means that the spatial distribution of charge in the atoms is changing momentarily following the laser irradiation. We have experimentally observed ultrafast melting process (femto-second order) for gold, a representative metal. Thus, the non-thermal melting mechanism is applicable to the metal from the theoretical study.

Report

(3 results)
  • 2015 Annual Research Report   Final Research Report ( PDF )
  • 2014 Research-status Report
  • Research Products

    (2 results)

All 2015 2014

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (1 results) (of which Invited: 1 results)

  • [Journal Article] 相対論的超短電子パルスによる超高速固体構造動力学の研究2015

    • Author(s)
      成瀬延康
    • Journal Title

      レーザー研究

      Volume: 43 Pages: 144-148

    • NAID

      130007957100

    • Related Report
      2015 Annual Research Report 2014 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] フェムト秒時間分解MeV 電子回折法による光誘起構造動力学研究2014

    • Author(s)
      成瀬延康
    • Organizer
      応用物理学会励起ナノプロセス研究会
    • Place of Presentation
      ホテルニセコいこいの村 北海道ニセコ町
    • Year and Date
      2014-09-20 – 2014-09-22
    • Related Report
      2014 Research-status Report
    • Invited

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Published: 2014-04-04   Modified: 2017-05-10  

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