Rotational quantum number; rotation quantum number;

转动量子数

So, that's the second quantum number.

这就是第二个量子数。

A quantum number, either + 1 ( even ) or - 1 ( odd ), that mathematically describes this property.

量子数的均衡从数学含义来描述对称性的量子数+1 ( 偶 ) 或 - 1 ( 奇 )

And each one of these energies, if it's a molecular energies, can be indexed by a quantum number of some sort.

每一项能量，可以用某个量子数标记。

Is equal to the sum over quantum number n1.

等于对n1求和。