Institut für Physikalische Chemie, Universität Göttingen, Tammannstrasse 6, D-37077 Göttingen, Germany.
J Chem Phys. 2012 Jul 14;137(2):024303. doi: 10.1063/1.4729369.
Experimental data from the literature for cross sections and rate constants for dissociative electron attachment to CF(3)Br, with separately varied electron and gas temperatures, are analyzed by a kinetic modeling approach. The analysis suggests that electronic and nuclear contributions to the rate constants can be roughly separated, the former leading to a negative temperature coefficient, the latter to a positive temperature coefficient. The nuclear factor in the rate constant is found to be of Arrhenius form with an activation energy which is close to the energy of crossing of the CF(3)Br and CF(3)Br(-) potential curves along the CBr bond.
通过动力学建模方法对文献中 CF(3)Br 分子的微分截面和电子俘获解离速率常数的实验数据进行了分析，这些数据分别考虑了电子和气体温度的变化。分析表明，速率常数中的电子和核贡献可以大致分离，前者导致负温度系数，后者导致正温度系数。速率常数中的核因子符合阿仑尼乌斯形式，其活化能接近于 CF(3)Br 和 CF(3)Br(-) 沿 CBr 键势能曲线交叉的能量。
