物理化学学报 >> 1994, Vol. 10 >> Issue (04): 330-335.doi: 10.3866/PKU.WHXB19940409

研究论文 上一篇    下一篇

C2H4-K体系中振动态至电子态传能的研究

李全新, 俞书勤, 陈从香, 马兴孝   

  1. 中国科学技术大学化学物理系,合肥 230026
  • 收稿日期:1992-09-02 修回日期:1993-01-26 发布日期:1994-04-15
  • 通讯作者: 李全新

The Study of Energy Transfer from Vibrational State to Electronic State in C2H4-K System

Li Quan-Xin, Yu Shu-Qin, Chen Cong-Xiang, Ma Xing-Xiao   

  1. Department of Modern Chemistry, University of Science and Technology of China, Hefei 230026
  • Received:1992-09-02 Revised:1993-01-26 Published:1994-04-15
  • Contact: Li Quan-Xin

摘要:

用TEA CO_2激光将C_2H_4分子激发到高振动激发态,高振动激发态的C_2H_4分子与基态的K原子碰撞发生振动态→电子态(V→E)传能过程,根据提出的能级组模型,对测得的时间分辨原子荧光信号进行处理,获得温度在453-663 K范围内,C_2H_4-K体系中V→E传能速率的数量级为10~(-10)/cm~3·molecule~(-1)·s~(-1),对应的碰撞传能截面约为0.30~0.80 nm.随着反应温度升高,V→E传能截面减小.上述实验结果表明碰撞体间吸引相互作用在这种非共振的V→E传能过程中起主要作用.利用多极相互作用势下的碰撞络合物模型对实验结果进行了讨论.

关键词: 高振动激发态, V→E传能, 能级组模型, 碰撞截面, 碰撞络合物模型

Abstract:

Ethylene molecules were excited to high vibrational states by a TEA CO_2 laser, and then coilided with ground electronic state potassium atoms, in order to study the vibrational state to electronic state (V-E) energy transfer. The rate constants have been obtained by fitting the measuxed tdrie-resolved potassium atom flou-rescence to a proposed kinetic energy level group model. The measured rate constants of the V-E energy transfer in C_2H_4-K system are about 10~(-10)/cm~3·molec s~(-1). in the temperature range 453—663 K. The corresponding cross sections vary from 0.30—0.80 nm and decrease with increasing temperature. The experimental results indicate that attractive interaction play a role in the above non-resonant V-E energy transfer. This results have been discussed based on a collision complex model involving multipole interaction potential.

Key words: High vibrationally excited state, V-E energy transfer, Rate constant, Cross section, Collision complex model, Energy level group model