Infrared Frequency-Modulation Probing of Product Formation in Alkyl + O2 Reactions: III. The Reaction of Cyclopentyl Radical (c-C5H9) with O2 between 296 and 723 K
Infrared Frequency-Modulation Probing of Product Formation in Alkyl + O2 Reactions: III. The Reaction of Cyclopentyl Radical (c-C5H9) with O2 between 296 and 723 K
复制标题
烷基 O2 反应中产物形成的红外调频探测：III。
DOI：
10.1021/jp010364t
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发表时间：
2001
影响因子：
2.9
通讯作者：
C. Taatjes
中科院分区：
文献类型：
--
作者：
John D. DeSain and;C. Taatjes
利用激光光解/连续波红外频率调制光谱研究了c-C5 H9 + O2反应生成的HO 2随温度（296−723 K）的变化。通过与Cl 2/CH 3OH/O2系统的比较，推导出HO 2产率，并进行校正以考虑由于涉及HO 2自由基和加合物c-C5 H9 O2的竞争反应而导致的HO 2信号损失。环戊基自由基形成后的HO 2信号的时间行为显示两个独立的组件。第一个组成部分是迅速产生的HO 2，它随温度的增加，是唯一的组件之间观察到296和500 K。快速生成的产率从296 K时的不足1%上升到693 K时的约23%。在高于500 K的温度下，还观察到HO 2信号的第二次缓慢上升。在较慢的时间尺度上的HO 2的生产可归因于环戊基过氧自由基分解。总的HO 2产率，包括缓慢上升的贡献，随着温度的升高而急剧增加。
The production of HO2 from the reaction of c-C5H9 + O2 has been investigated as a function of temperature (296−723 K) by using laser photolysis/CW infrared frequency modulation spectroscopy. The HO2 yield is derived by comparison with the Cl2/CH3OH/O2 system and is corrected to account for HO2 signal loss due to competing reactions involving HO2 radical and the adduct c-C5H9O2. The time behavior of the HO2 signal following cyclopentyl radical formation displays two separate components. The first component is a prompt production of HO2, which increases with temperature and is the only component observed between 296 and 500 K. The yield from the prompt production rises from less than 1% at 296 K to ∼23% at 693 K. At temperatures above 500 K a second slower rise in the HO2 signal is also observed. The production of HO2 on a slower time scale is attributable to cyclopentylperoxy radical decomposition. The total HO2 yield, including the contribution from the slower rise, increases dramatically with temperature...