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Theoretical study on the mechanism of the positron bindings to polyatomic molecules based on quantum Monte Carlo method

Research Project

Project/Area Number 18K05041
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 32010:Fundamental physical chemistry-related
Research InstitutionYokohama City University

Principal Investigator

Kita Yukiumi  横浜市立大学, 理学部, 准教授 (40453047)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords陽電子 / 陽電子親和力 / 振動励起 / 量子モンテカルロ法
Outline of Final Research Achievements

In order to elucidate the physical and chemical origin of unknown bound states of a positron in polyatomic molecules, in this study, we have established the theoretical methodology to assign positron annihilation spectra. Using (1) a new stochastic anharmonic vibrational state theory based on backflow transformation and (2) the accurate computational method to analyze the positron affinity and annihilation rate, we have succeeded in the nonempirical theoretical assignment of the annihilation spectra of polyatomic molecules.

Academic Significance and Societal Importance of the Research Achievements

陽電子は材料科学や核医学など幅広い分野で応用されているにもかかわらず、原子・分子への陽電子の吸着機構や陽電子吸着分子(陽電子化合物)の物性や対消滅機構といった基礎的性質は十分解明されていないのが現状である。本研究により陽電子化合物に対して極めて信頼性の高い基幹的データが蓄積され、物質と陽電子の相互作用に対する基礎的理解がさらに深まることで、陽電子を利用した機能性材料や代謝過程の非破壊的観測に対して有用な基盤情報が得られたと考えられる。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (18 results)

All 2020 2019 2018 Other

All Int'l Joint Research (2 results) Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (13 results) Remarks (1 results)

  • [Int'l Joint Research] University of Queensland(オーストラリア)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] University of Queensland(オーストラリア)

    • Related Report
      2019 Research-status Report
  • [Journal Article] First-principles quantum Monte Carlo studies for prediction of double minima for positronic hydrogen molecular dianion2020

    • Author(s)
      Ito Shumpei、Yoshida Daisuke、Kita Yukiumi、Tachikawa Masanori
    • Journal Title

      The Journal of Chemical Physics

      Volume: 153 Issue: 22 Pages: 224305-224305

    • DOI

      10.1063/5.0022673

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Theoretical analysis of the binding of a positron and pair-annihilation in fluorinated benzene molecules2020

    • Author(s)
      Kuniaki ONO, Takayuki OYAMADA, Yukiumi KITA, and Masanori TACHIKAWA
    • Journal Title

      The European Physical Journal D

      Volume: 74 Pages: 89-89

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] 多原子分子に対する陽電子対消滅スペクトルに関する理論的解析2020

    • Author(s)
      土肥 海人,立川仁典,北幸海
    • Organizer
      日本化学会第100春季年会2020
    • Related Report
      2019 Research-status Report
  • [Presentation] Backflow 変換を用いた新規振動座標による高精度非調和振動状態理論の開発2019

    • Author(s)
      石井桐子, 立川仁典, 北幸海
    • Organizer
      第22回理論化学討論会
    • Related Report
      2019 Research-status Report
  • [Presentation] アミノ酸分子への陽電子束縛と対消滅機構の理論的解析2019

    • Author(s)
      尾崎真椰,北幸海,立川仁典
    • Organizer
      第13回分子科学討論会2019名古屋
    • Related Report
      2019 Research-status Report
  • [Presentation] Backflow変換を用いた新規振動座標による非調和振動状態理論の開発2019

    • Author(s)
      石井桐子,立川仁典,北幸海
    • Organizer
      第13回分子科学討論会2019名古屋
    • Related Report
      2019 Research-status Report
  • [Presentation] 振動励起状態におけるアセトアルデヒド分子への陽電子束縛と対消滅メカニズムの理論的解析2019

    • Author(s)
      土肥 海人,立川仁典,北幸海
    • Organizer
      第13回分子科学討論会2019名古屋
    • Related Report
      2019 Research-status Report
  • [Presentation] Ab Initio Study of the Effect of Molecular Vibrations on the Positron-Binding to Polyatomic Molecules2019

    • Author(s)
      K. Dohi, Y. Kita, and M. Tachikawa
    • Organizer
      XX International Workshop on Low-Energy Positron and Positronium Physics
    • Related Report
      2019 Research-status Report
  • [Presentation] Development of accurate anharmonic vibrational state theory using a novel vibrational coordinate based on backflow transformation2019

    • Author(s)
      ISHII, Kiriko; TACHIKAWA, Masanori; KITA, Yukiumi
    • Organizer
      日本化学会 第99春季年会 (2019)
    • Related Report
      2018 Research-status Report
  • [Presentation] Theoretical analysis of the binding of a positron to acetaldehyde molecule2019

    • Author(s)
      DOHI, Kaito; TACHIKAWA, Masanori; KITA, Yukiumi
    • Organizer
      日本化学会 第99春季年会 (2019)
    • Related Report
      2018 Research-status Report
  • [Presentation] 高精度非調和振動状態解析に向けたbackflow相関因子の開発2018

    • Author(s)
      石井桐子、立川仁典、北幸海
    • Organizer
      日本コンピュータ化学会2018年春季年会
    • Related Report
      2018 Research-status Report
  • [Presentation] アセトアルデヒド分子への陽電子束縛に対するH/D同位体効果の理論的解析2018

    • Author(s)
      土肥海人、立川仁典、北 幸海
    • Organizer
      日本コンピュータ化学会2018年春季年会
    • Related Report
      2018 Research-status Report
  • [Presentation] CXY分子(X,Y=O,S)の陽電子親和力に関する理論的研究2018

    • Author(s)
      古島弥来、北幸海、立川仁典
    • Organizer
      第12回分子科学討論会2018福岡
    • Related Report
      2018 Research-status Report
  • [Presentation] First-principles study on the binding of a positron to polyatomic molecules2018

    • Author(s)
      Yukiumi KITA
    • Organizer
      16th International Congress of Quantum Chemistry
    • Related Report
      2018 Research-status Report
  • [Presentation] Effects of molecular vibrations on the binding of a positron to polyatomic molecules2018

    • Author(s)
      Yukiumi KITA, Yurika YAMADA, Umihiro URAKAWA, and Masanori TACHIKAWA
    • Organizer
      50th European Group on Atomic Systems
    • Related Report
      2018 Research-status Report
  • [Remarks] 量子物理化学研究室 - 横浜市立大学

    • URL

      http://www-user.yokohama-cu.ac.jp/~tachi/

    • Related Report
      2020 Annual Research Report

URL: 

Published: 2018-04-23   Modified: 2022-01-27  

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