Time-Dependent Radiolytic Yield of OH鈥?/sup> Radical Studied by Picosecond Pulse Radiolysis

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• 作者：Abdel Karim El Omar ; Uli Schmidhammer ; Pierre Jeunesse ; Jean-Philippe Larbre ; Mingzhang Lin ; Yusa Muroya ; Yosuke Katsumura ; Pascal Pernot ; Mehran Mostafavi
• 刊名：Journal of Physical Chemistry A
• 出版年：2011
• 出版时间：November 10, 2011
• 年：2011
• 卷：115
• 期：44
• 页码：12212-12216
• 全文大小：790K
• 年卷期：v.115,no.44(November 10, 2011)
• ISSN：1520-5215

文摘

Picosecond pulse radiolysis measurements using a pulse-probe method are performed to measure directly the time-dependent radiolytic yield of the OH^{鈥?/sup> radical in pure water. The time-dependent absorbance of OH鈥?/sup> 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鈥?/sup> is obtained by assuming the yield of the hydrated electron at 20 ps equal to 4.2 脳 10鈥? mol J鈥? and by assuming the values of the extinction coefficients of e_aq鈥?/sup> and OH鈥?/sup> at 782 nm (蔚_位=782聽nm = 17025 M鈥? cm鈥?) and at 263 nm (蔚_位=263聽nm = 460 M鈥? cm鈥?), respectively. The value of the yield of OH鈥?/sup> radical at 10 ps is found to be (4.80 卤 0.12) 脳 10鈥? mol J鈥?.}