Spectroscopy and kinetics of radical species related to atmospheric chemistry

与大气化学相关的自由基物种的光谱学和动力学

• 批准号: 13640502
• 负责人: TONOKURA Kenichi
• 金额: $ 2.3万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13640502/
• 关键词: Aromatic radical; laser spectroscopy; absorption spectrum; Rate constant; 大気化学; ラジカル; 高感度分光; 反応速度論

Knowledge of the kinetics of aromatic hydrocarbon free radicals is of primary importance in the modeling of atmospheric chemical reactions in urban air. Phenyl, phenoxy and benzyl radicals have been found in abundance in urban atmospheres. They also play a key role in high temperature hydrocarbon combustion systems where they are involved in the formation of polycyclic aromatic hydrocarbons and hence of soot.In the present work, we determined the absorption cross-sections of the phenyl, phenoxy and benzyl radicals. Based on the chemical kinetic simulation, the absorption cross-sections for the radicals have been determined.Based on the reaction kinetic simulation, the absorption cross-sections of phenoxy radical at 394.4 nm was determined to be σ_<446.5> = (7±2) x 10^<-18> cm^2 molecule^<-1>.The absorption cross-section of the benzyl radical at 447.7 nm was determined to be (2±1) x 10^<-18>cm^2 molecule^<-1> through analysis of time-dependent absorption traces.

芳烃自由基动力学的知识是在城市空气中的大气化学反应的模拟中的首要重要性。在城市大气中发现了大量的苯基、苯氧基和苄基自由基。他们也发挥了关键作用，在高温碳氢化合物燃烧系统中，他们参与的多环芳烃的形成，因此soods.In目前的工作，我们确定了吸收截面的苯基，苯氧基和苄基自由基。基于反应动力学模拟，确定了苯氧自由基在394.4 nm处的吸收截面为σ_<446.5>=（7±2）× 10 ~<-18>（^2）cm ~ 2·molecule·<-1>，苄基自由基在447.7 nm处的吸收截面为（2±1）× 10 ~<-18>（^2）cm ~ 2·molecule·<-1>.

项目成果

K.Tonokura et al.: "Cavity ring-down study of the visible absorption spectrum of the phenyl radical and kinetics of its reactions with Cl, Br, Cl_2, and O_2"J. Phys. Chem. A. 106. 5908-5917 (2002)

K.Tonokura等：“苯基自由基可见光吸收光谱的空腔衰荡研究及其与Cl、Br、Cl_2和O_2反应的动力学”J。

K.Tonokura et al.: "Cavity ring-down study of the visible absorption Spectrum of the Phenyl radical Kinetics of its reactions with Cl, Br, Cl_2 and O_2"J. Phys. Chem. A. 106. 5908-5917 (2002)

K.Tonokura等：“苯基自由基与Cl、Br、Cl_2和O_2反应的可见光吸收光谱的空腔衰荡研究”J。

K. Tonokura and M. Koshi: "Cavity ring-down spectroscopic study of the benzyl radical"J. Phys. Chem. A. in press.

K. Tonokura 和 M. Koshi：“苄基自由基的光腔衰荡光谱研究”J。

K.Tonokura, M.Koshi: "Cavity ring-down spectroscopic study of the benzylradical"J. Phys. Chem. A. (印刷中). (2003)

K. Tonokura，M. Koshi：“苯甲基自由基的空腔衰荡光谱研究”J. Phys A.（出版中）。

K. Tonokura. Y. Norikane, and M. Koshi, Y. Nakano, S Nakamichi, M. Goto, S. Hashimoto, M. Kawasaki, M. P. Sulbaek Andersen, M. D. Hurley, T. J. Wallington: "Cavity ring-down study of the visible absorption spectrum of the phenyl radical and kinetics of it

K. Tonokura。