C2H4-K体系中振动态至电子态传能的研究

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．

The Study of Energy Transfer from Vibrational State to Electronic State in C_2H_4-K System

Ethylene molecules were excited to high vibrational states by a TEA CO2 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 C2H4-K system are about 10-10/cm3 .molec 's-1. in the temperature range 453 -663K. The corresponding cross sections vary from 30 - 80 A2 and decrease with increas ing 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 coilision complex model involving multipole interaction potential.