Evaluation of catalytic effect of amorphous ice on the surface atomic reactions

2009 Fiscal Year Final Research Report

• Project/Area Number: 17104006
• Research Category: Grant-in-Aid for Scientific Research (S)
• Allocation Type: Single-year Grants
• Research Field: Petrology/Mineralogy/Science of ore deposit
• Research Institution: Hokkaido University
• Principal Investigator: KOUCHI Akira Hokkaido University, 低温科学研究所, 教授 (60161866)
• Co-Investigator(Kenkyū-buntansha): WATANABE Naoki 北海道大学, 低温科学研究所, 教授 (50271531)
• Project Period (FY): 2005 – 2009
• Keywords: 地球惑星物質 / 星間分子 / アモルファス氷 / 表面原子反応 / 低温

Research Abstract

Surface atomic reactions on interstellar grains at low temperatures are investigated experimentally using newly developed experimental setup. Formation mechanisms of H_2, H_2O, CO_2, H_2CO, and CH_3OH are clarified. Measurement of sticking coefficient of H-atoms onto amorphous water ice enables us to deduce reaction rate constants. We also showed that amorphous water ice enhances reactivity at higher temperatures compared with pure solid reactants.

Research Products

• [Journal Article] Direct measurements of hydrogen atom diffusion and the spin temperature of nascent H2 molecule on amorphous solid water (2010)
  • Author(s): Watanabe, N., Kimura, Y., Kouchi, A., Chigai, T., Hama, T., Pirronello, V.
  • Journal Title: Astrophys. J. Lett. (in press)
• [Journal Article] Experimental Study of CO2 formation by surface reactions of non-energetic OH radicals with CO molecules (2010)
  • Author(s): Oba, Y., Watanabe, N., Kouchi, A., Hama, T., Pirronello, V.
  • Journal Title: Astrophys. J. Lett. (in press)
• [Journal Article] Formation of amorphous H2O ice from the reactions of cold h atoms with solid O2 at 10 K (2010)
  • Author(s): Kouchi, A., Watanabe N., Hidaka, H., Miyauchi, N., Oba, Y., Chigai, T
  • Journal Title: Astron. Soc. Pacific Conf. Ser. (in press)
• [Journal Article] Reaction routes in the CO-H2CO-dn-CH3OH-dm system clarified from H(D) exposure of solid formaldehyde at low temperatures (2009)
  • Author(s): Hidaka, H., Watanabe, M., Kouchi, A., Watanabe, N.
  • Journal Title: Astrophys. J. 702 Pages: 291-300
• [Journal Article] Formation of compact amorphous H2O ice by codeposition of hydrogen atoms with oxygen molecules on grain surfaces (2009)
  • Author(s): Oba, Y., Miyauchi, N., Hidaka, H., Chigai, T., Watanabe, N., Kouchi, A.
  • Journal Title: Astrophys. J. 701 Pages: 464-470
• [Journal Article] Ice surface reactions: A key to chemical evolution in space (2008)
  • Author(s): Watanabe, N., Kouchi, A
  • Journal Title: Prog. Surf. Sci. 83 Pages: 439-489
• [Journal Article] Structural effects of ice grain surfaces on the hydrogenation of CO at low temperatures (2008)
  • Author(s): Hidaka, H., Miyauchi, N., Kouchi, A., Watanabe, N
  • Journal Title: Chem. Phys. Lett. 456 Pages: 36-40
• [Journal Article] Formation of hydrogen peroxide and water from the reaction of cold hydrogen atoms with solid oxygen at 10 K (2008)
  • Author(s): Miyauchi, N., Hidaka, H., Chigai, T., Nagaoka, A., Watanabe, N., Kouchi, A.
  • Journal Title: Chem. Phys. Lett. 456 Pages: 27-30
• [Journal Article] Effective rate constants for the surface reaction between solid methanol and deuterium atoms at 10 K (2007)
  • Author(s): Nagaoka, A., Watanabe, N., Kouchi, A.
  • Journal Title: J. Phys. Chem. A 111 Pages: 3016-3028
• [Journal Article] Temperature, composition, and hydrogen isotope effect in the hydrogenation of CO on amorphous ice surface at 10-20K (2007)
  • Author(s): Hidaka, H., Kouchi, A., Watanabe, N.
  • Journal Title: J. Chem. Phys. 126 Pages: 204707-1-204707-9
• [Journal Article] Effective rate constants for the surface reaction between solid methanol and deuterium atoms at 10 K (2007)
  • Author(s): Nagaoka A., Watanabe, N., Kouchi, A.
  • Journal Title: J. Phys. Chem. A 111 Pages: 3016-3028
• [Journal Article] Laboratory simulation of competition between hydrogenation and photolysis in the chemical evolution of H2O-CO ice mixture (2007)
  • Author(s): Watanabe, N., Mouri, O., Nagaoka, A., Chigai, T., Kouchi, A.
  • Journal Title: Astrophys. J. 668 Pages: 1001-1011
• [Journal Article] Dependence of the effective rate constants for the hydrogenation of CO on the temperature and composition of the surface (2006)
  • Author(s): Watanabe, N., Nagaoka, A., Hidaka, H., Shiraki, T., Chigai, T. Kouchi, A.
  • Journal Title: Planet. Space Sci. 54 Pages: 1107-1114
• [Journal Article] Novel routes for diamond formation in interstellar ices and meteoritic parent bodies (2005)
  • Author(s): Kouchi, A., Nakano, H., Kimura, Y. Kaito, C.
  • Journal Title: Astrophys. J. 626 Pages: L129-L132
• [Journal Article] H-D substitution in interstellar solid methanol: a key route for D enrichment (2005)
  • Author(s): Nagaoka, A., Watanabe, N., Kouchi, A.
  • Journal Title: Astrophys. J. 624 Pages: L29-L32
• [Presentation] Reaction of hydrogen atoms and molecules on amorphous solid water at very low temperatures (2009)
  • Author(s): N. Watanabe
  • Organizer: Gordon Research Conferences
  • Place of Presentation: Oxford, UK
  • Year and Date: 20090719-20090724
• [Presentation] Formation of interstellar ice by low temperature surface atomic reactions (2009)
  • Author(s): A. Kouchi, Y. Oba, N. Miyauchi, H. Hidaka, N Watanabe
  • Organizer: CRYO2009
  • Place of Presentation: Sapporo
  • Year and Date: 20090719-20090723
• [Book] 太陽系と惑星第8章「惑星と生命の起源」氷・有機物 (2008)
  • Author(s): 香内晃
  • Total Pages: 247-260
  • Publisher: 日本評論社
• [Remarks]
  • URL: http://www.lowtem.hokudai.ac.jp/astro/