English

　

大場　康弘（OBA, Yasuhiro）

略歴

　

2007年，炭素質隕石中有機化合物の安定同位体組成を用いた起源解明に関する研究で博士 (理学)を取得。

2007-2008年，University of Nevada-Reno (USA)にて溶存酸素分子の消費に伴う酸素同位体分別に関する研究に従事，

2008年より北大低温研で低温固体表面上における星間分子の化学進化に関する研究を遂行中。

2009年より日本学術振興会特別研究員(PD)「極低温星間塵表面原子反応によるアミノ酸の生成機構」。

Publications

Refereed Journals

2011 - present
  • “Experimental studies of surface reactions among OH radicals that yield H2O and CO2 at 40-60 K."
    Oba Y., Watanabe N., Kouchi A., Hama T., and Pirronello V.
    Physical Chemistry Chemical Physics, in press (2011)
  • “星間分子雲における二酸化炭素生成に関する実験的研究"
    大場　康弘, 渡部　直樹, 香内　晃, 羽馬　哲也, ピロネロ　バレリオ
    地球化学, in press (2011)

2010
  • “Formation of carbonic acid (H2CO3) by surface reactions of non-energetic OH radicals with CO molecules at low temperatures"
    Oba Y., Watanabe N., Kouchi A., Hama T., and Pirronello V.
    The Astrophysical Journal, 722, 1598-1606. (2010)
  • “Vertical carbon isotope change in acetate in a surface sediment from the northwestern Pacific Ocean"
    Kaneko, M., Oba Y., and Naraoka, H
    Researches in Organic Geochemistry
    , 26, 73-79. (2010)
  • “Direct evidence for ammonium ion formation in ice through ultraviolet-induced acid-base reaction of NH3 with H3O+”
    Moon E.-S., Kang H., Oba Y., Watanabe N., and Kouchi A.
    The Astrophysical Journal, 713, 906-911. (2010)
  • “Experimental study of CO2 formation by surface reactions of non-energetic OH radicals with CO molecules”
    Oba Y., Watanabe N., Kouchi A., Hama T., and Pirronello V.
    The Astrophysical Journal, 712, L174-L178. (2010)
  • “Diel behavior of stable isotopes of dissolved oxygen and dissolved inorganic carbon in rivers over a range of trophic conditions, and in a mesocosm experiment.”
    S. R. Parker, C. H. Gammons, S. R. Poulson, M. D. DeGrandpre, C. L. Weyer, M. G. Smith, J. N. Babcock, and Oba Y.
    Chemical Geology, 269, 22-32. (2010)

2009
  • “Oxygen isotope fractionation of dissolved oxygen during abiological reduction by aqueous sulfide”
    Oba Y., and Poulson S.R.
    Chemical Geology, 268, 226-232. (2009)
  • “Elemental and isotope behavior of macromolecular organic matter from CM chondrites during hydrous pyrolysis”
    Oba Y., and Naraoka H.
    Meteoritics and Planetary Science, 44, 943-953. (2009)
  • “Formation of compact amorphous H2O ice by codeposition of hydrogen atoms with oxygen molecules on grain surfaces”
    Oba Y., Miyauchi N., Chigai T., Hidaka H., Watanabe N., and Kouchi A.
    The Astrophysical Journal, 701, 464-470. (2009)
  • “Oxygen isotope fractionation of dissolved oxygen during reduction by ferrous iron”
    Oba Y., and Poulson S.R.
    Geochimica et Cosmochimica Acta, 73, 13-24. (2009)
  • 「極低温星間塵表面原子反応による水分子生成」
    大場　康弘，宮内　直弥，千貝　健，日高　宏，渡部　直樹，香内　晃
    地球化学, 第43巻, 117-131. (2009)


2008
  • “Carbon and hydrogen isotopic fractionation of low molecular weight organic compounds during ultraviolet degradation”
    Oba Y., and Naraoka H.
    Organic Geochemistry, 35, 501-509. (2008)
  • “ガスクロマトグラフ/同位体比質量分析計による分子レベル安定同位体比分析法”
    力石　嘉人， 大場　康弘
    Researches in Organic Geochemistry, 23/24, 99-122. (2008)
2007
  • “Carbon and hydrogen isotope fractionation of acetic acid during degradation by ultraviolet light”
    Oba Y., and Naraoka H.
    Geochemical Journal, 41, 103-110. (2007)

2006
  • “Site-specific carbon isotope analysis of aromatic carboxylic acids by elemental analysis-pyrolysis-isotope ratio mass spectrometry”
    Oba Y., and Naraoka H.
    Rapid Communications in Mass Spectrometry, 20, 3649-3653. (2006)
  • “Carbon isotopic composition of acetic acid generated by hydrous pyrolysis of macromolecular organic matter from the Murchison meteorite”
    Oba Y., and Naraoka H.
    Meteoritics and Planetary Science, 41, 1175-1181. (2006)

2003
  • “A different behavior of hydrogen isotope exchange in aqueous solutions between two PAH isomers (fluoranthene and pyrene)”
    Oba Y., and Naraoka H.
    Researches in Organic Geochemistry, 18, 29-35. (2003)
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国際会議プロシーディングス

  • V. Pirronello, M. Accolla, T. Hama, H. Hidaka, A. Kouchi, G. Manico, Y. Oba, and N. Watanabe “Laboratory investigations of physico-chemical processes occurring in icy mantles on interstellar dust grains” Physics and Chemistry of ice 2010, pp 361-368, Hokkaido University press (2011)
  • Y. Oba, N. Miyauchi, T. Chigai, H. Hidaka, N. Watanabe, and A. Kouchi“Formation of H2O ice through the surface reaction O2 + H at low temperatures: Reaction kinetics and structure of the ice” Physics and Chemistry of ice 2010, pp 369-378, Hokkaido University press (2011)
  • A. Kouchi, N. Watanabe, H. Hidaka, N. Miyauchi, Oba Y., and T. Chigai, “Formation of amorphous H2O ice from the reactions of cold H atoms with solid O2 at 10K” Cosmic Dust-Near & Far, ASP Conference Series 414, 338, (2009)
  • N. Watanabe, A. Kouchi, H. Hidaka, Oba Y., and N. Miyauchi, “Nonenergetic reactions between atomic hydrogen and molecules on interstellar grain surfaces” XXVI International Conference on Photonic, Electronic and Atomic Collisions, Journal of Physics: Conference Series, 194, 012044, (2009)

    • 国際会議発表

    2011-present
    • Y. Oba, N. Watanabe, A. Kouchi, T. Hama, and V. Pirronello, “Neutral radical-molecule reactions CO + OH on cold interstellar ices”, IAU symposium 280, The Molecular Universe, Toledo, Spain, 30 May-June 3, (2011)
    • Y. Oba, N. Miyauchi, H. Hidaka, T. Chigai, N. Watanabe, and A. Kouchi, “Sequential hydrogenation of molecular oxygen on cold surfaces: reaction kinetics and structure of formed H2O ice.”, IAU symposium 280, The Molecular Universe, Toledo, Spain, 30 May-June 3, (2011)
    2010
    • Y. Oba, N. Watanabe, A. Kouchi, T. Hama, and V. Pirronello, “Experimental studies on surface reactions of CO molecules with cold OH radicals at 10-40 K”, Pacifichem 2010, Honolulu, Hawaii, USA, 15-20 December, (2010)
    • Y. Oba, N. Watanabe, A. Kouchi, T. Hama, and V. Pirronello, “Formation of CO2 and H2CO3 through non-energetic surface reactions at low temperatures”, Workshop on Interstellar Matter 2010, Hokkaido Univ., 13-15 September, (2010)
    • Y. Oba, N. Miyauchi, H. Hidaka, T. Chigai, N. Watanabe, and A. Kouchi (invited),“Structure of H2O ice formed by surface reactions of oxygen molecules with hydrogen atoms at low temperatures”, 12th International Conference on the Physics and Chemistry of Ice, Hokkaido Univ., 5-10 September, (2010)
    • Y. Oba, N. Watanabe, A. Kouchi, T. Hama, and V. Pirronello, “Surface reactions of CO molecules with OH radicals at low temperatures”, 2010 Western Pacific Geophysics Meeting, Taipei, Taiwan, 22-25 June, (2010)
    • A. Kouchi, Y. Oba, N. Miyahchi, H. Hidaka, T. Chigai, and N. Watanabe (invited; talk given by Y. Oba), “Formation of compact amorphous water ice by surface atomic reactions at low temperatures”, 2010 Western Pacific Geophysics Meeting, Taipei, Taiwan, 22-25 June, (2010)
    2009
    • A. Kouchi, Y. Oba, N. Miyahchi, H. Hidaka, and N. Watanabe, “Formation of interstellar ice by low temperature surface atomic reactions”, CRYO2009, Hokkaido Univ., 19-23 July, (2009)
    • Y. Oba, N. Miyauchi, H. Hidaka, T. Chigai, N. Watanabe, and A. Kouchi,“Surface reactions of hydrogen atoms with oxygen molecules at low temperatures: A potential route for the H2O formation in space”, Horiba-ISSP International Symposium on "Hydrogen and water in condensed matter physics", Chiba, 12-16 October, (2009)
    • Y. Oba, N. Miyauchi, T. Chigai, H. Hidaka, N. Watanabe, and A. Kouchi,“Formation of compact amorphous H2O ice by a reaction of hydrogen atoms with oxygen molecules at low temperatures”, Gordon Research Conferences, Matrix-Isolated Species, Physics & Chemistry Of, Magdalen College, Oxford, UK, 19-24 July, (2009)
    2008
    • Y. Oba, N. Miyauchi, T. Chigai, H. Hidaka, N. Watanabe, and A. Kouchi,“Effective formation of H2O by the H-addition to solid O2 on amorphous D2O ice”, Workshop for Interstellar Matter 2008, Hokkaido Univ., 4-6 September, (2008)
    • Y. Oba and H. Naraoka,“Incorporation of hydrous oxygen into insoluble organic matter (IOM) of Murchison”, 71th Annual Meeting of the Meteoritical Society, Matsue, Shimane, July, (2008)
    Before 2007
    • Y. Oba and H. Naraoka,“Isotopic variation of macromolecular organic matter from CM chondrites during hydrous pyrolysis”, 31th Symposium on Antarctic Meteorites , Tokyo, June, (2007)
    • Y. Oba and H. Naraoka,“Carbon and hydrogen isotopic fractionations of organic compounds during UV degradation”, 16th Annual V. M. Goldschmidt Conference, Melbourne, Australia, August, (2006)
    • Y. Oba and H. Naraoka,“Intramolecular carbon isotopic distribution of macromolecular organic matter in carbonaceous chondrites (CM)”, 68th Annual Meeting of the Meteoritical Society, Gatlinburg, TN, USA, September, (2005)
    • Y. Oba and H. Naraoka,“Carbon and hydrogen isotopic compositions of acetic acid derived from macromolecular organic matter in the Murchison”, 29th Symposium on Antarctic Meteorites,Tokyo, June, (2005)
    • Y. Oba and H. Naraoka,“A different behavior of hydrogen isotope exchange between two PAH isomers (fluoranthen and pyrene)”, 13th Annual V. M. Goldschmidt Conference, Kurashiki, Okayama, September, (2003)

    受賞歴

    • 2010年度日本有機地球化学会研究奨励賞（田口賞）「炭素質隕石中有機化合物の安定同位体組成とその同位体分別プロセスに関する研究」