du So, we can also write delta u as integral from 1 to 2 of du.

我们也可以将Δu写成,从1到2的积分。

麻省理工公开课 - 热力学与动力学课程节选

So if we think about what that delta energy is, we call that the ionization of the 2 s, that's different from saying second ionization energy.

因此如果我们考虑这个，Δ，E，是什么的话，我们可以称它为，2，s，电子的电离能，这与我们前面所说的第二电离能是不同的。

麻省理工公开课 - 化学原理课程节选

Then we would be able to change our equation to make it a little bit more specific and say that delta energy here is equal to energy of n equals 6, minus the energy of the n equals 2 state.

第一激发态，我们就可以把方程,变得更具体一点，能量差,等于n等于6能量，减去n等于2的能量。

麻省理工公开课 - 化学原理课程节选

And what we say when we talk about the delta energy is I E 2 that this is going to be equal to i e 2, or the second ionization energy, or we could say the negative of the binding energy of a 2 s electron in b plus.

那么我们说,Δ，E，应该等于，或者说第二电离能，也就是正一价硼中，2，s，电子的,束缚能的负值。

麻省理工公开课 - 化学原理课程节选