Measurements of nuclear-spin temperature of water molecules produced from low-temperature surface reactions

• Project/Area Number: 22840001
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Geochemistry/Astrochemistry
• Research Institution: Hokkaido University
• Principal Investigator: HAMA Tetsuya 北海道大学, 低温科学研究所, 助教 (20579172)
• Project Period (FY): 2010 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000); Fiscal Year 2011: ¥1,495,000 (Direct Cost: ¥1,150,000、Indirect Cost: ¥345,000); Fiscal Year 2010: ¥1,625,000 (Direct Cost: ¥1,250,000、Indirect Cost: ¥375,000)
• Keywords: 彗星 / 星間分子雲 / アモルファス氷 / 表面 / 低温 / 原子反応 / 原子核スピン温度 / 原子核 / 低温固体表面温度

Research Abstract

The present study reports measurements of nuclear-spin temperatures of thermally desorbed H_2O molecules from amorphous solid water(ASW) by combining temperature-programmed desorption and resonance-enhanced multiphoton ionization. The nuclear-spin temperature of thermally desorbed H_2O molecules from ASW prepared at 8K was almost at the statistical high-temperature limit. This result suggests that the nuclear-spin temperatures of gaseous H_2O molecules thermally desorbed from comets do not necessarily reflect the surface temperature at which H_2O molecules condensed or formed

Research Products

• [Journal Article] Water Formation Through a Quantum Tunneling Surface Reaction, OH+H_2, at 10K (2012)
  • Author(s): Y. Oba, N. Watanabe, T. Hama, K. Kuwahata, H. Hidaka, A. Kouchi
  • Journal Title: Astrophys. J Volume: 749
  • Peer Reviewed
• [Journal Article] Water Formation Through a Quantum Tunneling Surface Reaction, OH+H_2 at 10 K (2012)
  • Author(s): Y.Oba, et al
  • Journal Title: The Astrophysical Journal Volume: 749 Issue: 1 Pages: 12-12
  • DOI: 10.1088/0004-637x/749/1/67
  • Peer Reviewed
• [Journal Article] A theoretical and experimental study on translational and internal energies of H_2O and OH from the 157 nm irradiation of amorphous solid water at 90 K (2011)
  • Author(s): S. Andersson, C. Arasa, A. Yabushita, M. Yokoyama, T. Hama, M. Kawasaki, C. M. Western, M. N. Ashfold
  • Journal Title: Phys. Chem. Chem. Phys Volume: 13, 35 Issue: 35 Pages: 15810-20
  • DOI: 10.1039/c1cp21138b
  • Peer Reviewed
• [Journal Article] Experimental studies of surface reactions among OH radicals that yield H2O and CO2 at 40-60K (2011)
  • Author(s): Y. Oba, N. Watanabe, A. Kouchi, T. Hama and V. Pirronello
  • Journal Title: Phys. Chem. Chem. Phys Volume: 13, 35 Pages: 15792-15797
  • NAID: 120005946606
  • Peer Reviewed
• [Journal Article] Surface abundance change in vacuum ultraviolet photodissociation of CO_2 and H_2O mixture ices (2011)
  • Author(s): T. Kinugawa, A. Yabushita, M. Kawasaki, T. Hama and N.Watanabe
  • Journal Title: Phys. Chem. Chem. Phys. Volume: 13, 35 Issue: 35 Pages: 15785-15791
  • DOI: 10.1039/c1cp20595a
  • Peer Reviewed
• [Journal Article] Spin Temperature of Water Molecules Desorbed from the Surfaces of Amorphous Solid Water, Vapor-deposited and Produced from Photolysis of a CH_4/O_2 Solid Mixture (2011)
  • Author(s): Hama,T., Watanabe,N., Kouchi,A., Yokoyama, M.
  • Journal Title: Astrophys. J. Lett. Volume: 738, 1 Issue: 1 Pages: L15-L15
  • DOI: 10.1088/2041-8205/738/1/l15
  • Peer Reviewed
• [Journal Article] ピロネロバレリオ(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 (2011)
  • Author(s): 大場康弘, 渡部直樹, 香内晃, 羽馬哲也
  • Journal Title: 地球化学 Volume: 45 Pages: 213-226
  • Peer Reviewed
• [Journal Article] Experimental studies of surface reactions among OH radicals that yield H_2O and CO_2 at 40-60 K (2011)
  • Author(s): Y. Oba, N. Watanabe, A. Kouchi, T. Hama and V. Pirronello
  • Journal Title: Phys. Chem. Chem. Phys. Volume: 13, 35 Issue: 35 Pages: 15792-15797
  • DOI: 10.1039/c1cp20596j
  • Peer Reviewed
• [Journal Article] Spin Temperature of Water Molecules Desorbed from the Surfaces of Amorphous Solid Water, Vapor-deposited and Produced from Photolysis of a CH_4/O_2 Solid Mixture (2011)
  • Author(s): T.Hama, N.Watanabe, A.Kouchi, M.Yokoyama
  • Journal Title: Astrophys.J.Lett. Volume: 738 Issue: 1 Pages: 27-27
  • DOI: 10.1088/0004-637x/727/1/27
  • Peer Reviewed
• [Journal Article] 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 (2011)
  • Author(s): 大場康弘, 渡部直樹, 香内晃, 羽馬哲也, ピロネロバレリオ
  • Journal Title: 地球化学 Volume: 45 Pages: 213-226
  • NAID: 110008913804
  • Peer Reviewed
• [Journal Article] Laboratory studies on the formation of formic Acid (HCOOH) in interstellar and cometary ices (2011)
  • Author(s): C.J.Bennett
  • Journal Title: Astrophys.J. Volume: 727
  • Peer Reviewed
• [Journal Article] Photodesorptions of OH radicals and oxygen atoms following vacuum ultraviolet photodissociation of water ice (2011)
  • Author(s): Tetsuya Hama
  • Journal Title: Physics and Chemistry of Ice 2010 Volume: (in press)
  • Peer Reviewed
• [Journal Article] Translational and rotational energy measurements of desorbed water molecules in their vibrational ground state following 157 nm irradiation of amorphous solid water (2011)
  • Author(s): Tetsuya Hama
  • Journal Title: Nuclear Instruments and Methods in Physics Research B Volume: (in press)
  • Peer Reviewed
• [Journal Article] 157nmレーザー光照射による氷からのOHラジカルとO原子の脱離機構 (2010)
  • Author(s): 羽馬哲也
  • Journal Title: 原子衝突研究協会誌「しょうとつ」 Volume: 7, 6 Pages: 5-15
  • Peer Reviewed
• [Journal Article] Formation of carbonic acid (H2CO3) by surface reactions of non-energetic OH radicals with CO molecules at low temperatures (2010)
  • Author(s): Oba Y.
  • Journal Title: Astrophys.J. Volume: 722 Pages: 1598-1606
  • Peer Reviewed
• [Journal Article] Role of OH radicals in the formation of oxygen molecules following vacuum ultraviolet photodissociation of amorphous solid water (2010)
  • Author(s): T.Hama
  • Journal Title: J.Chem.Phys. Volume: 133
  • NAID: 120002561300
  • Peer Reviewed
• [Journal Article] Direct measurements of hydrogen atom diffusion and the spin temperature of nascent H_2 molecule on amorphous solid water (2010)
  • Author(s): N.Watanabe
  • Journal Title: Astrophys.J.Lett. Volume: 714
  • Peer Reviewed
• [Journal Article] A desorption mechanism of water following vacuum-ultraviolet irradiation on amorphous solid water at 90 K (2010)
  • Author(s): T.Hama
  • Journal Title: J.Chem.Phys. Volume: 132
  • NAID: 120003386590
  • Peer Reviewed
• [Journal Article] Experimental study of CO2 formation by surface reactions of non-energetic OH radicals with CO molecules (2010)
  • Author(s): Y.Oba
  • Journal Title: Astrophys.J.Lett. Volume: 712
  • Peer Reviewed
• [Presentation] 共鳴多光子イオン化法による氷から熱脱離した水分子の原子核スピン温度測定実験 (2012)
  • Author(s): 羽馬哲也,渡部直樹,香内晃
  • Organizer: 日本物理学会第67回年次大会
  • Place of Presentation: 関西学院大学(西宮市)
  • Year and Date: 2012-03-24
• [Presentation] Spin temperature measurement of thermally desorbed water molecules from water ice prepared at 8K, 18th Symposium on Atomic, Cluster, and Surface Physics (2012)
  • Author(s): T. Hama, N. Watanabe and A. Kouchi
  • Organizer: The Conference Center de l' Alpe d' Huez
  • Place of Presentation: France
  • Year and Date: 2012-01-23
• [Presentation] Spin temperature measurement of thermally desorbed water molecules from water ice prepared at 8K (2012)
  • Author(s): T.Hama, N.Watanabe, A.Kouchi
  • Organizer: SASP2012
  • Place of Presentation: Alpe d'Huez (France)
  • Year and Date: 2012-01-23
• [Presentation] 氷から熱脱離した水分子の原子核スピン温度測定実験 (2011)
  • Author(s): 羽馬哲也,渡部直樹,香内晃
  • Organizer: 第2回表面科学若手研究会
  • Place of Presentation: (独)理化学研究所(埼玉県)
  • Year and Date: 2011-11-20
• [Presentation] 氷から熱脱離した水分子の原子核スピン温度測定実験 (2011)
  • Author(s): 羽馬哲也, 渡部直樹, 香内晃
  • Organizer: 第2回表面科学若手研究会
  • Place of Presentation: 理化学研究所(埼玉県)
  • Year and Date: 2011-11-20
• [Presentation] Surface diffusion of atomic hydrogen on ice grains at very low temperature (2011)
  • Author(s): T. Hama
  • Organizer: Mini-Workshop on Gas-Grain Interactions in Interstellar Clouds
  • Place of Presentation: Univ. of Tokyo(Tokyo)
  • Year and Date: 2011-10-28
• [Presentation] Surface diffusion of atomic hydrogen on ice grains at very low temperature (2011)
  • Author(s): T.Hama
  • Organizer: Mini-Workshop on Gas-Grain Interactions in Interstellar Clouds
  • Place of Presentation: Univ.of Tokyo (Tokyo)
  • Year and Date: 2011-10-28
• [Presentation] 重水素原子の低温氷表面における拡散 (2011)
  • Author(s): 羽馬哲也,渡部直樹,香内晃, V. Pirronello
  • Organizer: 日本物理学会秋季大会
  • Place of Presentation: 富山大学(富山市)
  • Year and Date: 2011-09-23
• [Presentation] アモルファス氷表面における水素原子の拡散メカニズム (2011)
  • Author(s): 羽馬哲也,渡部直樹,香内晃,木村勇気, V. Pirronello
  • Organizer: 第9回水素量子アトミクス研究会
  • Place of Presentation: 富山大学(富山市)
  • Year and Date: 2011-09-23
• [Presentation] アモルファス氷表面における水素原子の拡散メカニズム (2011)
  • Author(s): 羽馬哲也, 渡部直樹, 香内晃, 木村勇気, V.Pirronello
  • Organizer: 第9回水素量子アトミクス研究会
  • Place of Presentation: 東北大学(仙台市)
  • Year and Date: 2011-08-23
• [Presentation] REMPI measurements of spin temperatures of desorbed water molecules from vapor-deposited and photo-produced amorphous solid water at 8K (2011)
  • Author(s): T. Hama, N. Watanabe, A. Kouchi, M. Yokoyama
  • Organizer: 第27回化学反応討論会
  • Place of Presentation: 東京工業大学(東京都目黒区)
  • Year and Date: 2011-06-09
• [Presentation] REMPI measurements of spin temperatures of desorbed water molecules from vapor-deposited and photo-produced amorphous solid water at 8K (2011)
  • Author(s): T.Hama, N.Watanabe, A.Kouchi, M.Yokoyama
  • Organizer: 第27回化学反応討論会
  • Place of Presentation: 東京工業大学(東京都)
  • Year and Date: 2011-06-09
• [Presentation] Diffusion mechanism of hydrogen and deuterium atoms and the spin temperature of molecules on the surface of water ice at 8. 15 K, IAU Symposium280 (2011)
  • Author(s): T. Hama, N. Watanabe, Y. Kimura, A. Kouchi, T. Chigai, V. Pirronello
  • Organizer: The Molecular Universe
  • Place of Presentation: Univ. of Castilla-La Mancha(Spain)
  • Year and Date: 2011-06-02
• [Presentation] Diffusion mechanism of hydrogen and deuterium atoms and the spin temperature of molecules on the surface of water ice at 8-15K (2011)
  • Author(s): T.Hama, N.Watanabe, Y.Kimura, A.Kouchi, T.Chigai, V.Pirronello
  • Organizer: IAU Symposium280 : The Molecular Universe
  • Place of Presentation: Univ.of Castilla-La Mancha (Spain)
  • Year and Date: 2011-06-02
• [Presentation] 水素および重水素原子の氷表面拡散と水素分子生成 (2011)
  • Author(s): 羽馬哲也,渡部直樹,木村勇気,香内晃,千貝健
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 幕張メッセ(千葉)
  • Year and Date: 2011-05-23
• [Presentation] 水素および重水素原子の氷表面拡散と水素分子生成 (2011)
  • Author(s): 羽馬哲也, 渡部直樹, 木村勇気, 香内晃, 千貝健
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 幕張メッセ(千葉県)
  • Year and Date: 2011-05-23
• [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,渡部直樹,香内晃,木村勇気, V. Pirronello
  • Organizer: 日本物理学会第66回年次大会
  • Place of Presentation: 新潟大学(新潟市)
  • 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
  • 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] アモルファス氷表面上の光反応機構 (2011)
  • Author(s): 羽馬哲也
  • Organizer: CPSセミナー
  • Place of Presentation: 神戸大学(神戸市)
  • Year and Date: 2011-03-23
• [Presentation] 氷への真空紫外光照射による原子・分子・ラジカルの脱離 (2011)
  • Author(s): 羽馬哲也
  • 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(神奈川県)
  • Year and Date: 2011-02-16
• [Presentation] 氷への真空紫外光照射による原子・分子・ラジカルの脱離 (2011)
  • Author(s): 羽馬哲也
  • 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,神奈川県
  • Year and Date: 2011-02-16
• [Presentation] Spectroscopic approach to physicochemical processes on ices at low temperatures (2010)
  • Author(s): T. Hama, M. Yokoyama, A. Kouchi, N. Watanabe
  • Organizer: Pacifichem 2010
  • Place of Presentation: SheratonWaikiki(U. S. A)
  • Year and Date: 2010-12-18
• [Presentation] Spectroscopic approach to physicochemical processes on ices at low temperatures (2010)
  • Author(s): Tetsuya Hama
  • Organizer: PacifiChem 2010
  • Place of Presentation: Honolulu, Hawaii
  • Year and Date: 2010-12-18
• [Presentation] Formation of oxygen molecules following vacuum ultraviolet photodissociation of amorphous solid water (2010)
  • Author(s): T.Hama
  • Organizer: Workshop on Interstellar Matter 2010
  • Place of Presentation: Hokkaido Univ., Sapporo
  • Year and Date: 2010-09-13
• [Presentation] Photodesorptions of OH radicals and oxygen atoms following vacuumultraviolet photodissociation of water ice (2010)
  • Author(s): Tetsuya Hama
  • Organizer: 12th International Conference on the Physics and Chemistry of Ice
  • Place of Presentation: Hokkaido Univ., Sapporo
  • Year and Date: 2010-09-08
• [Presentation] Desorption mechanisms of photoproducts following 157 nm irradiation of water ice (2010)
  • Author(s): T.Hama
  • Organizer: 27th European Conference on Surface Science
  • 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
  • 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] 氷の光分解による酸素分子生成反応機構 (2010)
  • Author(s): 羽馬哲也
  • 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: 2010-08-09
• [Presentation] A desorption mechanism of water following vacuum-ultraviolet irradiation of amorphous solid water (2010)
  • Author(s): Tetsuya Hama
  • Organizer: 24th International Conference on Atomic Collisions in Solids
  • Place of Presentation: Krakow, Poland
  • Year and Date: 2010-07-22
• [Presentation] Experimental study of CO2 and H2CO3 formations by surface reactions of non-energetic OH radicals with CO molecules at very low temperatures (2010)
  • Author(s): T.Hama
  • 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
  • Organizer: 日本地球惑星科学連合2010年大会
  • Place of Presentation: 幕張メッセ,千蘂
  • Year and Date: 2010-05-26
• [Presentation] 氷の光分解から生成した酸素分子の電子励起状態 (2010)
  • Author(s): Tetsuya Hama
  • Organizer: 第10回分子分光研究会
  • Place of Presentation: 東京工業大学,東京
  • Year and Date: 2010-05-15
• [Remarks]
  • URL: http://www.lowtem.hokudai.ac.jp/astro/