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Detection of OH Radical in the Photodissociation of p-Aminobenzoic Acid at 266 nm
Can-hua Zhou, Shi-bo Cheng, Hong-ming Yin*, Guo-zhong He
State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
Abstract:
Photodissociation of p-aminobenzoic acid at 266 nm was investigated by probing the nascent OH photoproduct employing the laser-induced fluorescence technique. It was found that the nascent OH radical was vibrationally cold and its rotational state distribution conformed to be a Boltzmann behavior, characterized by a rotational temperature of 1040±110 K. The rotational energy of OH was determined to be 8.78±0.84 kJ/mol. Between the two spinorbit states of OH, 2Π3/2 and 2Π1/2, the former was found to be preferentially populated.The distribution of the Π(A′) state for the Λ-doublet was dominant. Finally, a probable mechanism for the formation of OH produced from the photodissociation of p-aminobenzoic acid is discussed.
Key words:  Photodissociation, OH radical, p-aminobenzoic acid, Laser-induced fluorescence technique
FundProject:
Detection of OH Radical in the Photodissociation of p-Aminobenzoic Acid at 266 nm
周灿华, 程世博, 尹鸿鸣*, 何国钟
中国科学院大连化学物理研究所分子反应动力学国家重点实验室,大连116023
摘要:
利用激光诱导荧光光谱方法研究了对氨基苯甲酸在266 nm条件下光解生成的OH自由基的高分辨振转光谱. 研究发现OH自由基几乎处于振动基态并且它的转动布居符合波尔兹曼分布,转动温度可表征为1040±110 K,相对应的转动能为8.78±0.84 kJ/mol.在2Π3/22Π1/2旋轨耦合态中,前者布居占多数;并且Λ分裂态的Π(A′)态占优. 最后讨论了OH自由基来自对氨基苯甲酸光解可能的解离机理.
关键词:  光解,OH自由基,对氨基苯甲酸,激光诱导荧光技术
DOI:10.1088/1674-0068/22/06/681-685
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