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Time-dependent radiolytic yield of OH$$^{bullet}$$ radical studied by picosecond pulse radiolysis

ピコ秒パルスラジオリシス法を用いた水酸化ラジカルの時間依存収量に関する研究

El Omar, A. K.*; Schmidhammer, U.*; Jeunesse, P.*; Labre, J. P.*; Lin, M.; 室屋 裕佐*; 勝村 庸介*; Pernot, P.*; Mostafavi, M.*

El Omar, A. K.*; Schmidhammer, U.*; Jeunesse, P.*; Labre, J. P.*; Lin, M.; Muroya, Yusa*; Katsumura, Yosuke*; Pernot, P.*; Mostafavi, M.*

ピコ秒バルスラジオリシスの手法を用いて、純水中のOHラジカル収量の時間依存性を測定した。263nmでのOHラジカルの吸収は水和電子の寄与、並びに空セル内に誘起される信号を差し引いて算出した。水和電子の20psでの収量を4.2$$times$$10$$^{-7}$$mol/Jとして、OHラジカルの20psでの収量を(4.80$$pm$$0.12)$$times$$10$$^{-7}$$mol/Jと決定した。

Picosecond pulse radiolysis measurements using a pulse-probe method are performed to measure directly the time-dependent radiolytic yield of the OH$$^{bullet}$$ radical in pure water. The time-dependent absorbance of OH$$^{bullet}$$ radical at 263 nm is deduced from the observed signal by substracting the contribution of the hydated electron and that of the irradiated empty fused silica cell which presents also a transient absoption. The time-dependent radiolytic yield of OH$$^{bullet}$$ is obtained by assuming the yield of the hydrated electron at 20 ps equal to 4.2$$times$$10$$^{-7}$$ mol/J. The value of the yield of OH$$^{bullet}$$ radical at 20 ps is found to be (4.80$$pm$$0.12)$$times$$10$$^{-7}$$ mol/J.

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パーセンタイル:81

分野:Chemistry, Physical

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