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Effect of molecular alignment on photoelectron angular distributions of chiral molecules

Research Project

Project/Area Number 16K05665
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Physical chemistry
Research InstitutionHealth Sciences University of Hokkaido

Principal Investigator

Suzuki Yoshi-Ichi  北海道医療大学, 薬学部, 講師 (10415200)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords光電子円二色性 / 時間反転 / 点群 / 光電子角度分布 / 多光子イオン化 / 分子整列 / ラセミ分割 / 時間反転対称性 / キラリティ / false chirality / 反跳効果 / 円偏光 / 磁気円二色性 / False chirality / 原子・分子物理学 / キラル / ホモキラリティ / 絶対不斉合成 / 円二色性
Outline of Final Research Achievements

Photoelectron circular dichroism is a phenomenon in which when the molecule has chirality and polarized light is circularly polarized, the intensity of photoelectrons becomes asymmetric in the forward and backward directions with respect to the light traveling direction. However, the theoretical explanation of the relationship between chirality and photoelectron circular dichroism has not been sufficiently described. In this study, when we consider photoelectron circular dichroism as a physical quantity, we clarified that it is neither symmetric nor antisymmetric with respect to time reversal. This is different from circular dichroism, which is symmetrical with respect to time reversal. As a result, it was revealed that the photoelectron circular dichroism exists not only for the chiral molecule but also for the π orbit of the linear molecule. The photoelectron circular dichroism of non-chiral molecules was also confirmed by numerical calculations on carbon monoxide.

Academic Significance and Societal Importance of the Research Achievements

気相でのエナンチオマーの選択的検出法については、最近多くの提案がなされている。エナンチオマーの選択は、宇宙空間での化学進化を考える際も重要な過程である。光電子円二色性の場合、光電子の反跳で、ラセミ体が自然に分離すると信じられている。今回の研究で、光電子円二色性は時間反転に関して、対象ではないことが明かになった。この物理的起源は、運動量が時間反転に関して、反対称であることである。よって、散乱の微分断面積は時間反転に関して対称ではない。このことは、教科書では、光イオン化と放射性再結合の関係の説明で使われている。今回の研究で、それ以外の現象の説明にも時間反転対称性が重要であることが明らかになたった。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (8 results)

All 2019 2018 2017 2016

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (6 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results)

  • [Journal Article] Circular dichroism in photoionization of degenerate orbitals: Spin-polarized photoelectrons and spontaneous separation of oriented photoions2018

    • Author(s)
      Suzuki Yoshi-Ichi
    • Journal Title

      The Journal of Chemical Physics

      Volume: 149 Issue: 20 Pages: 204312-204312

    • DOI

      10.1063/1.5054345

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Communication: Photoionization of degenerate orbitals for randomly oriented molecules: The effect of time-reversal symmetry on recoil-ion momentum angular distributions2018

    • Author(s)
      Suzuki Yoshi-Ichi
    • Journal Title

      The Journal of Chemical Physics

      Volume: 148 Issue: 15 Pages: 151101-151101

    • DOI

      10.1063/1.5026181

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 光イオン化積分断面積における円二色性2019

    • Author(s)
      鈴木喜一
    • Organizer
      物理学会第74回年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 縮重軌道についての光電子非対称性パラメータβ2018

    • Author(s)
      鈴木喜一
    • Organizer
      第12回分子科学討論会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Theory of photoionization dynamics of degenerate orbitals: time-reversal symmetry and molecular chirality2018

    • Author(s)
      Yoshi-ichi Suzuki
    • Organizer
      The 22nd East Asian Workshop on Chemical Dynamics
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Theory of Entanglement between Photoion Direction and Orbital Helicity of Achiral Molecules2017

    • Author(s)
      Yoshi-Ichi Suzuki
    • Organizer
      Chirality 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] らせん型分子軌道の光イオン化によるキラリティの生成2017

    • Author(s)
      鈴木喜一
    • Organizer
      第11回分子科学会
    • Related Report
      2017 Research-status Report
  • [Presentation] アキラル分子の光イオン化円二色性 -らせん型縮重分子軌道-2016

    • Author(s)
      鈴木喜一
    • Organizer
      原子衝突学会第41回年会
    • Place of Presentation
      富山大学
    • Year and Date
      2016-12-10
    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2020-03-30  

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