• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

2010 Fiscal Year Annual Research Report

氷表面反応の科学:原子トンネル反応と同位体分別機構

Research Project

Project/Area Number 21200048
Research InstitutionHokkaido University

Principal Investigator

渡部 直樹  北海道大学, 低温科学研究所, 教授 (50271531)

Co-Investigator(Kenkyū-buntansha) 日高 宏  北海道大学, 低温科学研究所, 助教 (00400010)
Keywords氷表面反応 / トンネル反応 / 星間塵 / 同位体分別
Research Abstract

本年度は,研究課題の主要な目的のひとつである,低温(アモルファス)氷表面での水素原子拡散の同位体効果および,水素原子再結合反応により生成した水素分子の原子核スピン温度の測定を行った.氷表面に存在する(重)水素原子をレーザー誘起脱離させたのちREMPI法により直接検出し,その強度の時間減衰(再結合による水素分子生成により引き起こされる)から表面拡散の情報の得た.その結果,表面温度8Kでは水素と重水素原子の間で拡散の速さに大きな違いは見られず,拡散はトンネル効果によるものではなく,アレニウス的なものであることが示唆された.このことは,表面再結合による水素分子の生成速度には同位体効果がほとんど現れないであろうことを意味する.再結合により生成した水素分子のスピン温度を測定したところ,およそ200K以上を示す高温平衡値3に近いことがわかった.また,生成した水素分子はアモルファス氷表面で再トラップされた後に,スピン温度が時間とともに下がる(オルソ→パラ転換する)事がわかった.この結果は,星間水素分子のスピン温度が温度領域により異なるという天文観値をうまく説明することができる.有機分子CH_3NH_2(メチルアミン)に関して,氷表面原子トンネル反応による重水素濃集が起こるか予備実験を行ったところ,HがDに置換する反応だけではなく,その逆のDがH置換するプロセスも進むことが分かった.

  • Research Products

    (37 results)

All 2011 2010

All Journal Article (6 results) (of which Peer Reviewed: 6 results) Presentation (31 results)

  • [Journal Article] Translational and rotational energy measurements of desorbed water molecules in their vibrational ground state following 157nm irradiation of amorphous solid water2011

    • Author(s)
      Tetsuya Hama, et al.
    • Journal Title

      Nuclear Instruments and Methods in Physics Research B

      Volume: (in press)

    • Peer Reviewed
  • [Journal Article] Formation of Carbonic Acid (H_2CO_3) by Surface Reactions of Non-energetic OH Radicals with CO Molecules at Low Temperatures2010

    • Author(s)
      Y.Oba, et al.
    • Journal Title

      Astrophys.J.

      Volume: 722 Pages: 1598-1606

    • Peer Reviewed
  • [Journal Article] Direct measurements of hydrogen atom diffusion and the spin temperature of nascent H_2 molecule on amorphous solid water2010

    • Author(s)
      N.Watanabe, et al.
    • Journal Title

      Astrophys.J.Lett.

      Volume: 714 Pages: L233-L237

    • Peer Reviewed
  • [Journal Article] A desorption mechanism of water following vacuum-ultraviolet irradiation on amorphous solid water at 90 K2010

    • Author(s)
      T.Hama, et al.
    • Journal Title

      J.Chem.Phys.

      Volume: 132 Pages: 164508-1-164508-8

    • Peer Reviewed
  • [Journal Article] Direct evidence for ammonium ion formation in ice through ultraviolet-induced acid-base reaction of NH_3 with H_3O^+2010

    • Author(s)
      E-S.Moon, et al.
    • Journal Title

      Astrophys.J.

      Volume: 713 Pages: 906-911

    • Peer Reviewed
  • [Journal Article] Experimental study of CO_2 formation by surface reactions of non-energetic OH radicals with CO molecules2010

    • Author(s)
      Y.Oba, et al.
    • Journal Title

      Astrophys.J.Lett.

      Volume: 712 Pages: L174-L178

    • Peer Reviewed
  • [Presentation] 水素-窒素原子低温表面反応によるアンモニア分子生成2011

    • Author(s)
      日高宏, 他
    • Organizer
      日本物理学会 第66回年次大会
    • Place of Presentation
      新潟大学,新潟県
    • Year and Date
      2011-03-28
  • [Presentation] 低温氷表面に吸着した水素原子の拡散メカニズム2011

    • Author(s)
      羽馬哲也, 他
    • Organizer
      日本物理学会第66回年次大会
    • Place of Presentation
      新潟大学,新潟県
    • Year and Date
      2011-03-28
  • [Presentation] 水素-窒素原子低温表面反応によるアンモニア分子生成2011

    • Author(s)
      日高宏, 他
    • Organizer
      日本物理学会第66回年次大会
    • Place of Presentation
      新潟大学,新潟県
    • Year and Date
      2011-03-28
  • [Presentation] イオン誘起核生成研究の現状-イオン移動管を用いた水和クラスタイオン生成装置の開発2011

    • Author(s)
      中井陽一, 他
    • Organizer
      日本物理学会第66回年次大会
    • Place of Presentation
      新潟大学,新潟県
    • Year and Date
      2011-03-27
  • [Presentation] 氷表面反応による星間分子の重水素濃集2011

    • Author(s)
      渡部直樹
    • Organizer
      2010年度宇宙空間原子分子過程研究会 低温衝突-星間分子から量子縮退気体まで
    • Place of Presentation
      JAXA,神奈川
    • Year and Date
      2011-02-16
  • [Presentation] イオン誘起微粒子核生成:素過程からのアプローチ2011

    • Author(s)
      渡部直樹
    • Organizer
      豊田理化学研究所特定課題研究・低温科学研究所共同利用「核生成の学理と応用」低温科学研究所共同利用「その場観察と理論による氷結晶成長カイネティクスの解明」合同研究会
    • Place of Presentation
      北海道大学,札幌
    • Year and Date
      2011-02-04
  • [Presentation] Spectroscopic approach to physicochemical processes on ices at low temperatures2010

    • Author(s)
      T.Hama, et al.
    • Organizer
      Pacifichem 2010
    • Place of Presentation
      Honolulu, Hawaii
    • Year and Date
      2010-12-18
  • [Presentation] Ammonia formation by the successive hydrogenation of N atom trapped in solid N_2 at below 30K2010

    • Author(s)
      H.Hidaka, et al.
    • Organizer
      Pacifichem 2010
    • Place of Presentation
      Honolulu, Hawaii
    • Year and Date
      2010-12-18
  • [Presentation] Experimental studies on surface reactions of CO molecules with cold OH radicals at 10-40 K2010

    • Author(s)
      Y.Oha, et al.
    • Organizer
      Pacifichem 2010
    • Place of Presentation
      Honolulu, Hawaii
    • Year and Date
      2010-12-18
  • [Presentation] 低温氷表面での原子分子過程と化学進化2010

    • Author(s)
      渡部直樹
    • Organizer
      理研シンポジウム:第1回拡がる原子分子物理研究:宇宙空間における原子分子進化過程
    • Place of Presentation
      (独)理化学研究所,埼玉県
    • Year and Date
      2010-12-03
  • [Presentation] Formation of CO_2 and H_2CO_3 through non-energetic surface reactions at low temperatures2010

    • Author(s)
      Y.Oba, et al.
    • Organizer
      Workshop on Interstellar Matter 2010(ISM2010)
    • Place of Presentation
      Hokkaido Univ., Sapporo(invited)
    • Year and Date
      2010-09-14
  • [Presentation] Ammonia formation by the successive hydrogenation of N atom trapped solid N2 at low temperature2010

    • Author(s)
      H.Hidaka, et al.
    • Organizer
      Workshop on Interstellar Matter 2010(ISM2010)
    • Place of Presentation
      Hokkaido Univ., Sapporo
    • Year and Date
      2010-09-13
  • [Presentation] Laboratory measurements of atomic hydrogen diffusion and the ortho-para conversion of nascent H_2 molecules on amorphous solid water2010

    • Author(s)
      N.Watanabe, et al.
    • Organizer
      Workshop on Interstellar Matter 2010(ISM2010)
    • Place of Presentation
      Hokkaido Univ., Sapporo
    • Year and Date
      2010-09-13
  • [Presentation] Translational and rotational energy measurements of vacuum-ultraviolet photodesorped water molecules in their vibrational ground state from amorphous solid water2010

    • Author(s)
      A.Yabushita, et al.
    • Organizer
      Workshop on Interstellar Matter 2010(ISM2010)
    • Place of Presentation
      Hokkaido Univ., Sapporo
    • Year and Date
      2010-09-13
  • [Presentation] Structure of H_2O ice formed by surface reactions of oxygen molecules with hydrogen atoms at low temperatures2010

    • Author(s)
      Yasuhiro Oba, et al.
    • Organizer
      12th International Conference on the Physics and Chemistry of Ice (PCI2010)
    • Place of Presentation
      Hokkaido Univ., Sapporo(invited)
    • Year and Date
      2010-09-10
  • [Presentation] Observational evidences of interstellar icy mantles on dust grains and laboratory investigations of physico-chemical processes2010

    • Author(s)
      Valerio Pirronello, et al.
    • Organizer
      12th International Conference on the Physics and Chemistry of Ice (PCI2010)
    • Place of Presentation
      Hokkaido Univ., Sapporo
    • Year and Date
      2010-09-09
  • [Presentation] Effect of amorphous solid water on surface tunneling reactions of atomic hydrogen2010

    • Author(s)
      Naoki Watanabe, et al.
    • Organizer
      12th International Conference on the Physics and Chemistry of Ice (PCI2010)
    • Place of Presentation
      Hokkaido Univ., Sapporo
    • Year and Date
      2010-09-09
  • [Presentation] Morphology effects in hydrogenation of CO at low temperature ice surfaces2010

    • Author(s)
      Hiroshi Hidaka, et al.
    • Organizer
      12th International Conference on the Physics and Chemistry of Ice (PCI2010)
    • Place of Presentation
      Hokkaido Univ., Sapporo
    • Year and Date
      2010-09-09
  • [Presentation] Formation of Ro-vibratinally excited H_2 from vacuum ultraviolet photodissociation of ice2010

    • Author(s)
      Akihiro Yabushita, et al.
    • Organizer
      12th International Conference on the Physics and Chemistry of Ice (PCI2010)
    • Place of Presentation
      Hokkaido Univ., Sapporo(invited)
    • Year and Date
      2010-09-08
  • [Presentation] Pbotodesorptions of OH radical and oxygen atom following vacuum ultraviolet photodissociation of water ice2010

    • Author(s)
      Tetsuya Hama, et al.
    • Organizer
      12th International Conference on the Physics and Chemistry of Ice (PCI2010)
    • Place of Presentation
      Hokkaido Univ., Sapporo
    • Year and Date
      2010-09-08
  • [Presentation] Ice surface chemistry of hydrogen atom in space2010

    • Author(s)
      N.Watanabe, et al.
    • Organizer
      27th European Conference on Surface Science (ECOSS 27)
    • Place of Presentation
      Groningen, the Netherlands(invited)
    • Year and Date
      2010-08-30
  • [Presentation] Desorption mechanisms of photoproducts following 157 nm irradiation of water ice2010

    • Author(s)
      T.Hama, et al.
    • Organizer
      27th European Conference on Surface Science (ECOSS 27)
    • Place of Presentation
      Groningen, the Netherlands
    • Year and Date
      2010-08-30
  • [Presentation] 水素原子のアモルファス氷表面拡散と水素分子生成2010

    • Author(s)
      羽馬哲也, 他
    • Organizer
      原子衝突研究協会第35回年会
    • Place of Presentation
      奈良女子大学,奈良県
    • Year and Date
      2010-08-11
  • [Presentation] 星間有機分子の重水素濃集:メチルアミン2010

    • Author(s)
      大場康弘, 他
    • Organizer
      第28回有機地球化学シンポジウム
    • Place of Presentation
      石油資源開発(株)長岡鉱業所,新潟県
    • Year and Date
      2010-08-05
  • [Presentation] Surface processes of atomic hydrogen at very low temperatures relevant to astrochemistry2010

    • Author(s)
      Naoki Watanabe
    • Organizer
      ICACS-24
    • Place of Presentation
      Krakow, Poland(invited)
    • Year and Date
      2010-07-22
  • [Presentation] Chemistry of atomic hydrogen on interstellar ice grains at very low temperatures2010

    • Author(s)
      N Watanabe, et al.
    • Organizer
      Western Pacific Geophysics Meeting
    • Place of Presentation
      Taipei, Taiwan(invited)
    • Year and Date
      2010-06-23
  • [Presentation] Formation of Compact Amorphous Water Ice by Surface Atomic Reactions at low Temperatures2010

    • Author(s)
      A.Kouchi, et al.
    • Organizer
      Western Pacific Geophysics Meeting
    • Place of Presentation
      Taipei, Taiwan(invited)
    • Year and Date
      2010-06-23
  • [Presentation] Surface Reactions of CO Molecules with OH Radicals at Low Temperatures2010

    • Author(s)
      Y.Oba, et al.
    • Organizer
      Western Pacific Geophysics Meeting
    • Place of Presentation
      Taipei, Taiwan
    • Year and Date
      2010-06-23
  • [Presentation] Experimental study of CO_2 and H_2CO_3 formation by surface reactions of non-energetic OH radicals with CO molecules at very low temperatures2010

    • Author(s)
      Oba, Yasuhiro, et al.
    • Organizer
      第26回化学反応討論会
    • Place of Presentation
      広島大学,広島県
    • Year and Date
      2010-06-02
  • [Presentation] A desorption mechanism of water following vacuum-ultraviolet irradiation on amorphous solid water at 90 K2010

    • Author(s)
      Yokoyama, Masaaki, et al.
    • Organizer
      第26回化学反応討論会
    • Place of Presentation
      広島大学,広島県
    • Year and Date
      2010-06-02
  • [Presentation] アモルファス氷への真空紫外光照射による水分子脱離メカニズム2010

    • Author(s)
      羽馬哲也, 他
    • Organizer
      日本地球惑星科学連合2010年大会
    • Place of Presentation
      幕張メッセ,千葉県
    • Year and Date
      2010-05-26

URL: 

Published: 2012-07-19  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi