b The repulsive term goes as some constant lower case b divided by R to the n. N is not the quantum number.

这种斥力很想一个固定的小写字母,被R到n分开的话，N不是量子数。

麻省理工公开课 - 固态化学导论课程节选

I'm going to write the particular case of R and take derivatives.

我会写出 R 的一个特例,然后对其求导

耶鲁公开课 - 基础物理课程节选