Time-dependent radiolytic yield of OH 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.*

Journal of Physical Chemistry A, 115(44), p.12212 - 12216, 2011/10

https://doi.org/10.1021/jp208075v

Picosecond pulse radiolysis measurements using a pulse-probe method are performed to measure directly the time-dependent radiolytic yield of the OH radical in pure water. The time-dependent absorbance of OH 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 is obtained by assuming the yield of the hydrated electron at 20 ps equal to 4.210 mol/J. The value of the yield of OH radical at 20 ps is found to be (4.800.12)10 mol/J.