Investigation of bimolecular self-reaction between two hydrated electron in water

• Project/Area Number: 25630433
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Nuclear engineering
• Research Institution: Osaka University
• Principal Investigator: Muroya Yusa 大阪大学, 産業科学研究所, 准教授 (40334320)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2013: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
• Keywords: 放射線化学反応 / 水和電子 / 再結合 / 二量体 / 水素発生

Outline of Final Research Achievements

Bimolecular self-reaction between two hydrated electron generated by ionizing radiation in water is regarded as one of predominant reaction to form molecular hydrogen. It was investigated by using highly time-resolved pulse radiolysis method and numerical simulation based on spur-diffusion model. The reactivity was evaluated at various conditions such as dose rate, temperature, and pH, which revealed that the reaction can occur smoothly at high temperature contrary to the previous belief. It was also found out that there exists an intermediate state in the stepwise reaction process, in which the reaction path can be affected by solutes such as hydroxide ion.

Research Products

• [Journal Article] Quick measurement of continuous absorption spectrum in ion beam pulse radiolysis: Application of optical multi-channel detector into transient species observation (2016)
  • Author(s): K. Iwamatsu, Y. Muroya, S. Yamashita, A. Kimura, M. Taguchi, Y. Katsumura
  • Journal Title: Radiat. Phys. Chem. Volume: 119 Pages: 213-217
  • DOI: 10.1016/j.radphyschem.2015.10.024
  • Peer Reviewed / Open Access
• [Journal Article] Deciphering the reaction between a hydrated electron and a hydronium ion at elevated temperatures (2015)
  • Author(s): J. Ma, S. Yamashita, Y. Muroya, Y. Katsumura, M. Mostafavi
  • Journal Title: Phys. Chem. Chem. Phys. Volume: 17 Issue: 35 Pages: 22934-22939
  • DOI: 10.1039/c5cp04293c
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Chemical repair activity of free radical scavenger, edaravone: Reduction reactions with dGMP hydroxyl radical adducts and suppression of base lesions and AP sites on irradiated plasmid DNA. (2015)
  • Author(s): Hata K, Urushibara A, Yamashita S, Lin M, Muroya Y, Shikazono N, Yokoya A, Fu H, Katsumura Y
  • Journal Title: Journal of Radiation Research Volume: 56 Issue: 1 Pages: 59-66
  • DOI: 10.1093/jrr/rru079
  • NAID: 120006502225
  • Peer Reviewed / Open Access
• [Journal Article] Sequential radiation chemical reactions in aqueous bromide solutions: pulse radiolysis experiment and spur model simulation (2015)
  • Author(s): S. Yamashita, K. Iwamatsu, Y. Maehashi, M. Taguchi, K. Hata, Y. Muroya and Y. Katsumura
  • Journal Title: RSC Adv. Volume: 5 Issue: 33 Pages: 25877-25886
  • DOI: 10.1039/c5ra03101j
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] On the Temperature Dependence of the Rate Constant of the Bimolecular Reaction of two Hydrated Electrons (2013)
  • Author(s): S.L. Butarbutar, Y. Muroya, L.M. Kohan, S. Sanguanmith, J. Meesungnoen, J.-P. Jay-Gerin
  • Journal Title: Atom Indonesia Volume: 39 Pages: 51-56
  • Peer Reviewed
• [Presentation] 高温水のピコ秒パルスラジオリシス：スパー拡散過程における素反応 (2016)
  • Author(s): 室屋裕佐
  • Organizer: 日本原子力学会2016年春の大会
  • Place of Presentation: 宮城
  • Year and Date: 2016-03-26
• [Presentation] ピコ秒パルスプローブによる高温高圧流体の放射線誘起高速反応研究 (2015)
  • Author(s): 室屋裕佐
  • Organizer: 先端放射線化学シンポジウム
  • Place of Presentation: 静岡
  • Year and Date: 2015-09-29
• [Presentation] 高温水および超臨界水の放射線分解反応初期過程 (2015)
  • Author(s): 室屋裕佐
  • Organizer: 第59回放射化学討論会
  • Place of Presentation: 宮城
  • Year and Date: 2015-09-25
• [Presentation] 高温水および超臨界水のピコ秒放射線分解反応 (2015)
  • Author(s): 室屋裕佐
  • Organizer: 日本原子力学会2015年秋の大会
  • Place of Presentation: 静岡
  • Year and Date: 2015-09-09
• [Presentation] Radiolysis of water at high temperature and pressure conditions:: A picosecond pulse radiolysis experiment and numerical simulations (2015)
  • Author(s): Yusa Muroya
  • Organizer: Symposium on Water Chemistry and Corrosion in Nuclear Power Plants in Asia 2015
  • Place of Presentation: Kalpakkam, India
  • Year and Date: 2015-09-02
  • Int'l Joint Research
• [Presentation] 超臨界水のピコ秒パルスラジオリシスとモンテカルロ計算 (2015)
  • Author(s): 室屋裕佐
  • Organizer: 第52回アイソトープ・放射線研究発表会
  • Place of Presentation: 東京
  • Year and Date: 2015-07-08
• [Presentation] Observation of solvated electron at elevated temperatures up to supercritical condition by the newly improved ps pulse-probe system (2015)
  • Author(s): Yusa Muroya
  • Organizer: 15th International Congress of Radiation Research
  • Place of Presentation: Kyoto
  • Year and Date: 2015-05-25
  • Int'l Joint Research
• [Presentation] Fast Process of Water Radiolysis at High Temperature and High Pressure (2014)
  • Author(s): Yusa Muroya, Daisuke Hatomoto, Yosuke Katsumura, Mingzhang Lin, Shinichi Yamashita, Jean-Paul Jay-Gerin, Takahiro Kozawa
  • Organizer: Nuclear Plant Chemistry Conference
  • Place of Presentation: Sapporo, Japan
  • Year and Date: 2014-10-26 – 2014-10-31
• [Presentation] A Picosecond Pulse Radiolysis Study of Methanol and Ethanol at Extreme Conditions up to Supercritical State (2014)
  • Author(s): Yusa MUROYA, Daisuke HATOMOTO, Testuro YOSHIDA, Shinichi YAMASHITA, Yosuke KATSUMURA, and Takahiro KOZAWA
  • Organizer: Asia Pacific Symposium on Radiation Chemistry
  • Place of Presentation: Tokyo, Japan
  • Year and Date: 2014-09-08 – 2014-09-11
• [Presentation] A Picosecond Pulse Radiolysis Study of Water at Extreme Conditions up to Supercritical State (2014)
  • Author(s): Yusa MUROYA, Daisuke HATOMOTO, Testuro YOSHIDA, Shinichi YAMASHITA, Mingzhang LIN, Yosuke KATSUMURA, and Takahiro KOZAWA
  • Organizer: Asia Pacific Symposium on Radiation Chemistry
  • Place of Presentation: Tokyo, Japan
  • Year and Date: 2014-09-08 – 2014-09-11
• [Presentation] Reactivity of Hydrated Electron Formed by Radiolysis of Water at High Temprature (2014)
  • Author(s): Daisuke HATOMOTO, Yusa MUROYA, Yosuke KATSUMURA, Shinichi YAMASHITA, and Takahiro KOZAWA
  • Organizer: Asia Pacific Symposium on Radiation Chemistry
  • Place of Presentation: Tokyo, Japan
  • Year and Date: 2014-09-08 – 2014-09-11
• [Presentation] A picosecond pulse radiolysis study on water and alcohols at extreme conditions up to supercritical regime with the latest system updates (2014)
  • Author(s): Yusa Muroya, Daisuke Hatomoto, Yosuke Katsumura, Mingzhang Lin, Shinichi Yamashita, Jean-Paul Jay-Gerin, Takahiro Kozawa
  • Organizer: Gordon Research Conference
  • Place of Presentation: MA, USA
  • Year and Date: 2014-07-13 – 2014-07-18
• [Presentation] Time-dependent radiolytic yield and reactivity of hydrated electron at high temperature and high pressure (2014)
  • Author(s): Daisuke Hatomoto, Yusa Muroya, Yousuke Katsumura, Shinichi Yamashita,Takahiro Kozawa
  • Organizer: Gordon Research Conference
  • Place of Presentation: MA, USA
  • Year and Date: 2014-07-13 – 2014-07-18
• [Presentation] 高温・超臨界水の放射線化学反応初期過程 (2014)
  • Author(s): 室屋裕佐
  • Organizer: 第94回日本化学会
  • Place of Presentation: 名古屋
• [Presentation] Radiolysis of water at high temperature and pressure conditions (2013)
  • Author(s): Yusa Muroya
  • Organizer: 3rd Asian Congress of Radiation Research
  • Place of Presentation: Beijing, China
• [Presentation] 高温水・超臨界水の放射線分解反応機構 (2013)
  • Author(s): 室屋裕佐
  • Organizer: 第50回アイソトープ・放射線研究発表会
  • Place of Presentation: 東京
• [Presentation] 超臨界水の放射線化学反応初期過程 (2013)
  • Author(s): 室屋裕佐
  • Organizer: 第56回放射線化学討論会
  • Place of Presentation: 広島
• [Presentation] Radiolysis of water at high temperature and pressure conditions (2013)
  • Author(s): Yusa Muroya
  • Organizer: Symposium on Water Chemistry and Corrosion in Nuclear Power Plants in Asia 2013
  • Place of Presentation: Taichung, Taiwan