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

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

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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Category:Chemistry, Physical

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