Time-Dependent Radiolytic Yield of OH∙ Radical Studied by Picosecond Pulse Radiolysis.

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 subtracting the contribution of the hydrated 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 4.2 x 10-7 mol J-1 and by assuming the values of the extinction coefficients of Due to image rights restrictions, multiple line equation(s) cannot be graphically displayed. and OH∙ at 782 nm (ελ=782 nm = 17025 M-1 cm-1) and at 263 nm (ελ=263 nm = 460 M-1 cm-1), respectively. The value of the yield of OH∙ radical at 10 ps is found to be (4.80 ± 0.12) x 10-7 mol J-1. [ABSTRACT FROM AUTHOR]