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Effects of magnetism and magnetic-field on the ortho-para conversion of hydrogen on solid surfaces

Research Project

Project/Area Number 17360017
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Thin film/Surface and interfacial physical properties
Research InstitutionThe University of Tokyo

Principal Investigator

FUKUTANI Katsuyuki  The University of Tokyo, Institute of Industrial Science, Professor (10228900)

Co-Investigator(Kenkyū-buntansha) OKANO Tatsuo  The University of Tokyo, Institute of Industrial Science, Professor (60011219)
WILDE Markus  The University of Tokyo, Institute of Industrial Science, Research Associate (10301136)
KASAI Hideaki  Osaka University, Graduate School of Engineering, Professor (00177354)
Project Period (FY) 2005 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥16,470,000 (Direct Cost: ¥15,300,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2007: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2006: ¥4,700,000 (Direct Cost: ¥4,700,000)
Fiscal Year 2005: ¥6,700,000 (Direct Cost: ¥6,700,000)
KeywordsHydrogen / Nuclear spin / Ortho-para conversion / Magnetic-field effect / Magnetic surfaces / Rotational energy / Oxygen / エネルギー散逸 / 物理吸着 / 核スピン転換 / 磁性体
Research Abstract

Molecular hydrogen has a remarkable feature that it has two nuclear-spin modifications of ortho and para species. The purpose of the present project is to investigate the magnetic effect on the ortho-para conversion of hydrogen on transition-metal oxide surfaces. To achieve this, we have first developed an apparatus that allows us to experimentally study the ortho-para conversion on single-crystal surfaces under a strong magnetic field. As a sensitive probe of ortho and para hydrogen, we have also developed laser induced fluorescence via the E, F state, where the infra-red emission between the E, F and B states were measured with a InGaAs photomultiplier.
With this technique, we measured the ortho-para conversion time of H2 and D2 adsorbed on a Cr203(0001) surface grown on a Cr(110) surface at 8 K. The conversion time was found to be 210 and 540 s for H2 and D2, respectively. These values are considerably longer than those at the 02-adsorbed surface, which were also investigated in the … More present project. In the Cr203 bulk, each Cr ion has a 3/2 spin, which is antiferromagnetically ordered. On the (0001) surface, only a half of the Cr ion is present on the surface to alleviate the electro-static energy. As a result, the surface looks ferromagnetically ordered thereby yielding a weak inhomogeneous magnetic field. As a next step, we measured the H2 ortho-para conversion under magnetic fields of 0, 1, and 3 T at a sample temperature of 44.5 K the conversion time was found to be 108, 108, and 116 min at 0, 1, and 3 T, respectively. A theory suggests that there appears a magnetic-field effect in the case that the rotational energy of ortho-H2 is dissipated into the electronic system of the substrate. The present experimental results indicate that the rotational energy should be accommodated by either magnetic excitation or phonon excitation of the Cr2O3 surface. Furthermore, it was found that the conversion time is strongly dependent on the sample temperature: while no definite conversion was observed at 300 K, the conversion was accelerated at 40 K These results imply that a dynamic conversion mechanism is operative in addition to the static ortho-para conversion in the physisorption well.
To further get insight into the effect of surface magnetism on the ortho-para conversion, the conversion time was measured on a Ag surface with magnetic impurities of O2 molecules. With increasing the O2 coverage, the conversion was found to be dramatically accelerated. With the aid of Monte Carlo simulations, the conversion time in the vicinity of adsorbed 02 was concluded to be 8.2 s. This value compares well with an existing theory. Less

Report

(4 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • 2005 Annual Research Report
  • Research Products

    (29 results)

All 2009 2008 2007 2006 2005

All Journal Article (20 results) (of which Peer Reviewed: 9 results) Presentation (9 results)

  • [Journal Article] Development of Low-temperature Field Emission Apparatus2009

    • Author(s)
      A. Kashifuku, M. Yoshino, K. Fukutani, T. Okano
    • Journal Title

      J. Vac. Soc. Jpn. Vol. 52, No. 2

      Pages: 102-104

    • NAID

      10024897783

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Development of Low-temperature Field Emission Apparatus2009

    • Author(s)
      A. Kashifuku, M. Yoshino, K. Fukutani, T. Okano
    • Journal Title

      J. Vac. Soc. Jpn. Vol. 52-No. 2

      Pages: 102-10

    • NAID

      10024897783

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Problem of Gas Dose with Micro-Capillary Array2009

    • Author(s)
      T. Sugimoto, T. Okano, K. Fukutani
    • Journal Title

      J. Vac. Soc. Jpn. 52

      Pages: 141-141

    • NAID

      10024897857

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] UHV-type synchrotron radiation reflectometer2008

    • Author(s)
      T. Kwauchi, M. Matsumoto, K. Fukutani, T. Okano, Y. Suetsugu, X. W. Zhang, Y. Yoda
    • Journal Title

      Vacuum 83

      Pages: 873-877

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Influence of carbon deposition on the hydrogen distribution in Pd nanoparticles and their reactivity in olefin hydrogenation2008

    • Author(s)
      M. Wilde, K. Fukutani, W. Ludwig, B. Brandt, J. -H. Fischer, S. Schauermann, H. -J. Freund
    • Journal Title

      Angew. Chem. Int. Ed 47

      Pages: 9289-9293

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Mechanism of the ortho-para conversion of hydrogen on Ag surfaces2008

    • Author(s)
      K. Niki, T. Kawauchi, M. Matsumoto, K. Fukutani, T. Okano
    • Journal Title

      Phys. Rev. B 77

      Pages: 201403-201403

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Novel method to evaluate the carbon network of single-walled carbon nanotubes by hydrogen physisorption2007

    • Author(s)
      S. Iwata, Y. Sato, K. Nakai, S. Ogura, T. Okano, M. Namura, A. Kasuya, K. Tohji. K. Fukutani
    • Journal Title

      J. Phys. Chem. C Lett. 111

      Pages: 14937-14941

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Location of Hydrogen Adsorbed on Rh(111) Studied by Low-Energy Electron Diffraction and Nuclear Reaction Analysis2007

    • Author(s)
      M. Fukuoka, M. Okada, M. Matsumoto, S. Ogura, K. Fukutani, T. Kasai
    • Journal Title

      Phys. Rev. B 75

      Pages: 235434-235434

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 金属表面に吸着した水素の量子効果2006

    • Author(s)
      福谷克之, 笠井秀明
    • Journal Title

      表面科学 27

      Pages: 213-219

    • NAID

      10018133327

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Quantum effects of hydrogen on metal surfaces2006

    • Author(s)
      K. Fukutani, K. Kasai
    • Journal Title

      Journal of The Surface Science Society of Japan 27

      Pages: 213-219

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Molecular orientation dependence of ortho-para H2 conversion on Fe(OH)3 cluster induced by hyperfine contact interaction2006

    • Author(s)
      R. Muhida, M. David, M. M. Rahman, W. A. Dino, H. Nakanishi H. Kasai, K. Fukutani, T. Okano
    • Journal Title

      Eur. Phys. J. D 38

      Pages: 99-101

    • Related Report
      2006 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Dynamical low-energy electron diffraction analyses of clean and H-adsorbed Ir(111) surfaces2006

    • Author(s)
      M. Matsumoto, S. Ogura, K. Fukutani, T. Okano, M. Okada
    • Journal Title

      J. Vac. Soc. Jpn. 49

      Pages: 313-315

    • NAID

      10017581182

    • Related Report
      2006 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Growth and vibrational properties of ultra-thin Cr203 films grown on Cr(110) studied by RAIRS2006

    • Author(s)
      H. Hagiwara, S. Koya, M. Wilde, M. Matsumoto, T. Okano, K. Fukutan
    • Journal Title

      Surf. Sci. 600

      Pages: 3252-3252

    • Related Report
      2006 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Evaluation of non-resonant background in hydrogen depth profiling via 1H(15N.ag) 12C nuclear reaction analysis near 13.35 MeV2005

    • Author(s)
      Markus Wilde, Katsuyuki Fukutani
    • Journal Title

      Nucl.Instr.and Meth.Phys.Res.B vol.232

      Pages: 280-284

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Reactivity of gold thin films grown on iridium : Hydrogen dissociation2005

    • Author(s)
      M.Okada, S.Ogura, W.A.Dino, M.Wilde, K.Fukutani, T.Kasai
    • Journal Title

      Applied Catalysis A : General. vol.291

      Pages: 55-61

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Reactive gold thin films grown on iridium2005

    • Author(s)
      M.Okada, S.Ogura, W.A.Dino, M.Wilde, K.Fukutani, T.Kasai
    • Journal Title

      Applied Surface Science. vol.246

      Pages: 68-71

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Trapping hydrogen with a bimetallic surface2005

    • Author(s)
      M.Okada, K.Moritani, T.Kasai, W.A.Dino, H.Kasai, S.Ogura, M.Wilde, K.Fukutani
    • Journal Title

      Physical Review B. vol.71

      Pages: 33408-33408

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Quantitative coverage and stability of hydrogen-passivation layers on HF-etched Si(1-x)Ge(x) surfaces2005

    • Author(s)
      M.Wilde, K.Fukutani, S.Koh, K.Sawano, Y.Shiraki
    • Journal Title

      Journal of Applied Physics. vol.98

      Pages: 23503-23503

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Estimation of absorbed hydrogen on Ni(111) surface by slow-positron beam2005

    • Author(s)
      Y.Oishi, T.Wada, I.Kanazawa, K.Fukutani, Y.Murata, Y.Ito, K.Nozawa, F.Komori
    • Journal Title

      Appl.Surf.Sci. vol.241

      Pages: 169-173

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Photodesorption of hydrogen molecules physisorbed on Ag : Isotope dependence of transrational-energy distribution2005

    • Author(s)
      K.Fukutani, K.Niki, T.Ito, H.Tashiro, M.Matsumoto, M.Wilde, T.Okano, W.A.Dino, H.Kasai
    • Journal Title

      Surface Science. vol.593

      Pages: 229-234

    • Related Report
      2005 Annual Research Report
  • [Presentation] カーボンナノチューブ表面への分子の物理吸着2009

    • Author(s)
      岩田晋弥, 小倉正平, 李相吉, 福谷克之, 佐藤義倫, 田路和幸
    • Organizer
      日本物理学会第64回年次大会
    • Place of Presentation
      立教大学
    • Year and Date
      2009-03-30
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Molecular Physisorption at the Surface of Single-walled Carbon Nanotubes2009

    • Author(s)
      S. Iwata, S. Ogura, S. K. Lee, K. Fukutani, Y. Sato, K. Tohji
    • Organizer
      The Physical Society of Japan 2009 Spring Meeting
    • Place of Presentation
      Rikkyo Univ.
    • Year and Date
      2009-03-30
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Ir(111)上のAu島成長における吸着子効果2009

    • Author(s)
      小倉正平, 福谷克之
    • Organizer
      日本物理学会第64回年次大会
    • Place of Presentation
      立教大学
    • Year and Date
      2009-03-27
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 氷表面におけるH2, D2の核スピン転換2009

    • Author(s)
      杉本敏樹, 二木かおり, 松本益明, 福谷克之
    • Organizer
      日本物理学会第64回年次大会
    • Place of Presentation
      立教大学
    • Year and Date
      2009-03-27
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 表面・サブサーフェスにおける水素の電子状態とダイナミクス-超低速ミュオンヘの期待2009

    • Author(s)
      福谷克之
    • Organizer
      日本物理学会シンポジウム
    • Place of Presentation
      立教大学
    • Year and Date
      2009-03-27
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Adsorbate effects on Au island growth on Ir(111)2009

    • Author(s)
      S. Ogura, K. Fukutani
    • Organizer
      The Physical Society of Japan 2009 Spring Meeting
    • Place of Presentation
      Rikkyo Univ.
    • Year and Date
      2009-03-27
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Nuclear-spin flip of H2 and D2 on ice surfaces2009

    • Author(s)
      T. Sugimoto, K. Niki, M. Matsumoto, K. Fukutani
    • Organizer
      The Physical Society of Japan 2009 Spring Meeting
    • Place of Presentation
      Rikkyo Univ.
    • Year and Date
      2009-03-27
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Electronic states and dynamics of hydrogen at surfaces and subsurfaces : expectation for low-energy muon2009

    • Author(s)
      K. Fukutani
    • Organizer
      Symposium of The Physical Society of Japan
    • Place of Presentation
      Rikkyo Univ.
    • Year and Date
      2009-03-27
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 水素分子のオルソ・パラ転換における磁場共鳴効果の測定2007

    • Author(s)
      元島勇太, 二木かおり, 藤原理悟, 岡野達雄, 福谷克之
    • Organizer
      日本物理学会秋季大会
    • Place of Presentation
      北海道大学
    • Related Report
      2007 Annual Research Report

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Published: 2005-04-01   Modified: 2021-04-07  

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