电子云等效体积的含义和计算方法

he meaning of the equivalent volume of electron cloud was offered. Expressions for the equivalent volume was derived. The equivalent volume of electron cloud in He atom was calculated with the expressions. The calculated result is in good agreement with that obtained from the measured refractive index. This work proves the validity of the concept of the equivalent volume of electron cloud. This concept reflects the characteristic of electron cloud under electromagnetic induction. It can be used to analyze the ability of the electron cloud gaining energy from electromagnetic induction in a quantitative way.