Using the two state approximation of the time dependent porturbation theory,the formu-las of the transition probability,the state state reaction cross section and rasection rate for resor-nant vibration vibration energy transfer between molecules in a electric field have been derived.

This paper points out that the accuracy of normal approximation of binomial distribution varies with parameter p and the value k of random variable with the maximum test frequency n .

Its normal approximation performs not well in small or moderate sample size situations.

During the process of consecutive first-order reaction, the trend of the intermediate is largely determined by the ratio of the rate coefficient; therefore this case leads to an important method:steady-state approximation.