Laser Photolysis of Carboxylic Acids in the Gas Phase. Direct Determination of the OH Quantum Yield at 222 nm.
Laser Photolysis of Carboxylic Acids in the Gas Phase. Direct Determination of the OH Quantum Yield at 222 nm.
复制标题
气相中羧酸的激光光解。
DOI：
10.1002/chin.199018085
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
R. Irwin
中科院分区：
文献类型：
--
作者：
D. Singleton;G. Paraskevopoulos;R. Irwin
本文首次在两个温度下测定了甲酸、乙酸和丙酸蒸气在222 nm处光解生成OH自由基的初级量子产率。还测定了222 nm处各酸单体和二聚体的吸收截面。量子产率的测量是通过使用激光光解共振吸收技术，并相对于从硝酸的光解OH的量子产率，这是作为一个单位。发现来自单体的OH量子产率如下：甲酸，0.70-0.80;乙酸，0.55-0.70;丙酸，0.15-0.35。二聚体的量子产率对甲酸为0.15，对其它酸接近于零。的单体和二聚体的OH量子产率的差异被解释在由二聚体的结构所施加的反应途径。
The primary quantum yields for formationof OH radicals in the photolysis of the monomer and dimer of formic, acetic, and propionic acid vapor at 222 nm have been determined at two temperatures for the first time. The absorption cross sections of the monomer and dimer of each acid were also determined at 222 nm. The quantum yield measurements were made by using a laser photolysis-resonance absorption technique and are relative to the quantum yield of OH from the photolysis of nitric acid, which was taken as unity. The OH quantum yields from the monomers were found to be the following: formic, 0.70-0.80; acetic, 0.55-0.70; propionic, 0.15-0.35. The quantum yields from the dimers were 0.15 for formic acidand near zero for the other acids. The differences in OH quantum yields for the monomer and dimer are interpreted in terms of the reaction pathway imposed by the structure of the dimer.