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Energy dissipation process in H2 ortho-para conversion on surface

Research Project

Project/Area Number 20K05337
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 29020:Thin film/surface and interfacial physical properties-related
Research InstitutionJapan Atomic Energy Agency

Principal Investigator

Ueta Hirokazu  国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 原子力科学研究所 先端基礎研究センター, 研究副主幹 (20705248)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2022: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords水素分子 / 表面 / 核スピン / 回転エネルギー
Outline of Research at the Start

核スピンと回転状態の変化を伴う水素分子のオルトーパラ(o-p)転換は,様々な固体表面で誘起されることが知られているが,転換における回転エネルギーの散逸過程は未だ理解されていない.エネルギー散逸を理解する糸口として表面温度依存性を調べる.本研究では脱離温度が高い吸着系を研究対象とし,広範囲の温度領域でo-p転換確率を調べることで回転エネルギー散逸を理解することを目的とする.

Outline of Final Research Achievements

Considering the interconversion between ortho and para states of H2 is accompanied by the nuclear spin flip and the rotational-energy transfer, the surface-temperature dependence of the ortho-to-para conversion of molecularly chemisorbed H2 on Pd(210) is studied at a surface temperature range of 41-60 K. The conversion rate is accelerated with increasing surface temperature. We analyze the temperature dependence of the conversion rate taking account of both electron and phonon systems of the substrate. The tendency of experimental results can be explained by the conversion model in which rotational energy is transferred into surface phonons as well as surface electrons in o-p conversion.

Academic Significance and Societal Importance of the Research Achievements

分子-表面間のエネルギー移動を明らかにすることは,分子と固体表面の相互作用を理解する上で重要である.過去の研究より,固体表面上での分子の振動エネルギーの散逸過程は明らかになってきているが,分子の他の自由度である回転エネルギーの散逸過程については未解明である.本研究によって,オルト‐パラ転換に伴う回転エネルギーが固体表面の電子系とフォノン系の両方に散逸されることが明らかになった.本成果は分子-表面間のエネルギー移動の全容解明につながるものである.

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (9 results)

All 2023 2022 2021 2020

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (7 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] Ortho-Para Conversion of Molecularly Chemisorbed H<sub>2</sub> on Pd(210)2021

    • Author(s)
      UETA Hirokazu、FUKUTANI Katsuyuki
    • Journal Title

      Vacuum and Surface Science

      Volume: 64 Issue: 9 Pages: 430-434

    • DOI

      10.1380/vss.64.430

    • NAID

      130008087640

    • ISSN
      2433-5835, 2433-5843
    • Year and Date
      2021-09-10
    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Direct measurement of fast ortho-para conversion of molecularly chemisorbed H2 on Pd(210)2020

    • Author(s)
      Ueta H.、Sasakawa Y.、Ivanov D.、Ohno S.、Ogura S.、Fukutani K.
    • Journal Title

      Physical Review B

      Volume: 102 Issue: 12 Pages: 121407-121407

    • DOI

      10.1103/physrevb.102.121407

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] ニッケル表面での水素原子の表面反応におけるスピン効果2023

    • Author(s)
      植田寛和,大橋悠生,石崎雄士,Z.-D. Sun,小澤孝拓,福谷克之
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Rotational-energy transfer in ortho-para conversion of molecularly chemisorbed H2 on Pd(210)2022

    • Author(s)
      H. Ueta and K. Fukutani
    • Organizer
      The 1st Workshop on Molecular Dynamics at Surfaces: Nuclear Spin Conversion
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Rotational-energy transfer of hydrogen molecule on solid surface2022

    • Author(s)
      H. Ueta and K. Fukutani
    • Organizer
      the 22nd International Vacuum Congress
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 表面吸着水素分子の核スピン転換2022

    • Author(s)
      植田寛和,福谷克之
    • Organizer
      第 36回プラズマ新領域研究会「計測技術の基礎と最新動向」
    • Related Report
      2021 Research-status Report
  • [Presentation] A role of rotational energy transfer in H2 ortho-para conversion2021

    • Author(s)
      Hirokazu Ueta, Katsuyuki Fukutani
    • Organizer
      The 9th Inthernational Symposium on Surface Science
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Pd(210)表面に化学吸着した水素分子のオルト-パラ転換時間測定2020

    • Author(s)
      植田寛和,笹川裕矢,Ivanov Dmitry,大野哲,小倉正平,福谷克之
    • Organizer
      日本物理学会秋季大会
    • Related Report
      2020 Research-status Report
  • [Presentation] パラジウムステップ表面に吸着した水素分子のオルトーパラ転換2020

    • Author(s)
      植田寛和,笹川裕矢,Ivanov Dmitry,大野哲,小倉正平,福谷克之
    • Organizer
      日本表面真空学会学術講演会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2025-03-27  

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