Acids with different cation were distinguishingly different in activation energy and frequency factor distribution.
不同阳离子的同种羧酸盐，活化能和频率因子分布却相差很大。
英语百科
Pre-exponential factor
In chemical kinetics, the pre-exponential factor or A factor is the pre-exponential constant in the Arrhenius equation, an empirical relationship between temperature and rate coefficient. It is usually designated by A when determined from experiment, while Z is usually left for collision frequency.