UV absorption spectrum, formation and disappearance of the oxide radical ion O•- in aqueous solution:: A pulse radiolysis study

被引：18

作者：

Alam, MS ^{[1
]}

Janata, E ^{[1
]}

机构：

[1] Hahn Meitner Inst Berlin GmbH, Bereich Solarenergieforsch, D-14109 Berlin, Germany

来源：

CHEMICAL PHYSICS LETTERS | 2006年 / 417卷 / 4-6期

关键词：

D O I：

10.1016/j.cplett.2005.10.057

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The formation and disappearance of 0(center dot-) in oxygen-free aqueous solution at pH 13 has been studied and its spectrum has been redetermined utilizing pulse radiolysis optical measurements in the UV region. The rate constant for the reaction H-center dot + OH- is determined to be 2.5 x 10(7) dm(3) Mol(-1) s(-1). A determination of the rate constants for the equilibrium (OH)-O-center dot + OH- double left right arrow 0(center dot-) was not possible; the pK value for this equilibrium was determined to be 11.9. The rate constant for the demerisation 0(center dot-) + 0(center dot-) was measured at 325 nm to be 2k = 2 x 10(9) dm(3) Mol(-1) s(-1). The absorption spectrum of O center dot- differs significantly from that in the literature below 250 nm. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：363 / 366

页数：4

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