Development of attosecond pulse radiolysis

2016 Fiscal Year Final Research Report

• Project/Area Number: 26249146
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Nuclear engineering
• Research Institution: Osaka University
• Principal Investigator: Yoshida Yoichi 大阪大学, 産業科学研究所, 教授 (50210729)
• Co-Investigator(Kenkyū-buntansha): 近藤 孝文 大阪大学, 産業科学研究所, 助教 (50336765) ; 菅 晃一 大阪大学, 産業科学研究所, 助教 (60553302)
• Co-Investigator(Renkei-kenkyūsha): GOHDO Masao 大阪大学, 産業科学研究所, 特任研究員 (60705094) ; OGATA Atsushi 大阪大学, 産業科学研究所, 特任研究員 (60023727) ; SHIBATA Hiromi 大阪大学, 産業科学研究所, 特任研究員(客員准教授) (30216014) ; KOBAYOSHI Hitoshi 大阪大学, 産業科学研究所, 特任研究員(客員教授) (80133099)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 放射線工学・ビーム科学 / パルスラジオリシス / 放射線化学 / 量子ビーム産業応用

Outline of Final Research Achievements

By constructing a broadband THz Michelson interferometer, pulse width of electron beam can be measured to the attosecond. It was successfully generated an electron beam pulse of 8.7 fs with good reproducibility. As a result of construction of a double decker THz pulse radiolysis system, carrier density of quasi - free electrons in Si could be observed. And then we have extended the measurement wavelength of pulse radiolysis and found that an excited radical cation is directly related in radiolysis of dodecane. In ethanol, pre - solvation electrons were observed in the near infrared region, and it was found from the time constant that cleavage of hydrogen bond was related to pre - solvation electron formation. Radiation decomposition and protection effect of polystyrene was studied, by observing formation of dimer radical cation and excimer, and branching ratio of reaction was estimated.

Free Research Field

放射線化学