Acta Chimica Sinica ›› 2002, Vol. 60 ›› Issue (2): 256-260. Previous Articles     Next Articles

Original Articles

CCl2(A^1B1)自由基不同振动态的猝灭动力学

高义德;冉琴;陈yang;陈从香   

  1. 中国科学院选键化学开放实验室.南京(210008);中国科学技术大学化学物理系. 安徽(230026)
  • 出版日期:2002-02-15 发布日期:2002-02-15

The collisional quenching of CCl2(A^1B1) in different vibrational states by quenchers

Gao Yide;Ran Qin;CHEN ya;Chen Congxiang   

  1. Nanjing Inst Geol & Palaeontol, Acad Sinica, Selective Oxidat.Nanjing (210008);Univ Sci & Technol China, Dept Chem Phys.Anhui(230026)
  • Online:2002-02-15 Published:2002-02-15

CCl2 free radicals were produced by D. C. discharge of CCl4(in Ar). Ground electronic state CCl2 radical was electronically excited to A^1B1 (0, 3, 0), (0, 4, 0), (1, 3, 0), (0, 6, 0), (1, 4, 0) and (2, 2, 0) vibronic states by Nd:YAG laser pumped dye laser at the wavelength of 550.56, 541.52, 532.25, 524.31, 523.82 and 523.37 nm, respectively. Experimental quenching rate data of CCl2(A^1B1 and a^3B1) by NH3, H2O, CH2Br2, NH(CH3)2, NH(C2H5)2, N(C2H5)3, and n-C6H14 were obtained by observign the time resolved fluorescence signals from the excited CCl2 radical transitions, which showed a superposition of two exponential decay components. The state-resolved rate constnats kA and ka were acquired by analyzing and dealing with these data by using three-level- model, which was put forward by us.

Key words: FREE RADICAL REACTION, DISCHARGE, DICHLOROCARBENE, VIBRATIONAL STATE, QUENCHING, DYNAMICS

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