物理化学学报 >> 1994, Vol. 10 >> Issue (12): 1081-1086.doi: 10.3866/PKU.WHXB19941206

研究论文 上一篇    下一篇

束-气条件下He(23S)与CH3Cl及CH3I的传能研究

李全新, 陈从香, 马兴孝, 李学初, 沈关林   

  1. 中国科学技术大学近代化学系,合肥 230026|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
  • 收稿日期:1993-11-25 修回日期:1994-02-28 发布日期:1994-12-15
  • 通讯作者: 马兴孝

The Study of Energy Transfer Reaction form He(23S) to CH3Cl and CH3I in a Beam-gas Condition

Li Quan-Xin, Chen Cong-Xiang, Ma Xing-Xiao, Li Xue-Chu, Shen Guan-Lin   

  1. Department of Chemical Physics,University of Science and Technology of China,Hefei 230026|State Key Laboratory of Molecular Reaction Dynamics,Dalian Institute of Chemical Physics,CAS,Dalian 116023
  • Received:1993-11-25 Revised:1994-02-28 Published:1994-12-15
  • Contact: Ma Xing-Xiao

摘要:

在束-气条件下,通过检测产物的化学发光,研究了亚稳电子激发态He(23S)原子与CH3Cl、CH3I传能反应.采用参比反应的方法,测得了由上述反应产生的主要碎片CH(A2△)、CH(B2∑-)、CH(C2∑+)和H*形成速率常数.通过对测得的CH(A2△-X2∏r)和CH(B2∑--X2∏r)色散谱进行计算机模拟,获得了初生态的CH(A2△,v=0-2)和CH(B2∑-,v=0态)的振动-转动布居,实验结果表明,CH(A2△,v=0)态的转动布居是呈双Boltzman分布的,并且反应的可资用能大部分将转变成产物的平动能.根据实验结果和反应阈能的分析,本文对He(23S)与CH3Cl/CH3I传能反应机理进行了探讨.

关键词: 束-气条件, 碎片形成速率常数, 可资用能, 振动-转动分布

Abstract:

The energy transfer reactios from He(23S) to CH3Cl and CH3I have been studied in a beam-gas condition by observing the emission of the excited state products. The formation rate constants of CH(A), CH(B) and CH(C) produced by He(23S) with CH3Cl or CH3I were determined. The nascent rovibrational distrbution of CH(A2△, v'= 0 - 2) and CH(B2 ∑-,V' = 0) from above reactions were obtained by a computer simulation of CH(A - X, B - X) emission. The experimental results showed that the major of the reaction available energies is deposited into the translation energies of the products. The mechanism of the energy transfer reactions from He(23S) to CH3Cl and CH3I were also discussed.

Key words: Beam-gas condition, The formation rate constants, Available energy, Rovibrational distribution