在分子轨道理论中，我们基于轨道的对称性给它们命名。
In molecular orbital theory, we named orbits based on their symmetry.
回想一下我们为双原子创建的分子轨道图。
Recall the molecular orbital diagrams we created for diatomics back.
今天我们要讲的是分子轨道理论。
原子轨道的线性叠加，成分子轨道。
Linear combination of atomic orbitals into molecular orbitals.
这就是我们所说的分子轨道。
所以降低了分子轨道的能量。
这就是成键分子轨道的概念。
轨道是沿着键轴,有节面的分子轨道。
Pi orbitals are a molecular orbital that have a nodal plane through the bond axis.
这意味着分子轨道里，一共有八个点子。
This means we need a total of eight electrons in our molecular orbitals.
接着我们就建立分子轨道。
让我们继续填充分子轨道。
我们会称它为2py分子轨道上的π键。
另一方面分子轨道理论，是基于量子力学的。
So, molecular orbital theory, on the other hand, is based on quantum mechanics.
这就是分子轨道图。
是因为分子轨道是两个,1s原子轨道的组合。
The 1 s just comes from the fact that the molecular orbital is a combination of two 1 s atomic orbitals.
这意味着我们一共有，6个电子要放进分子轨道。
So, this means we have a total of six electrons that we need to put into molecular orbitals.
这是氮原子，这是氮原子，然后这是氮气的分子轨道。
Here is the atomic nitrogen, here is the atomic nitrogen and these are the orbitals of molecular nitrogen.
这对于分子也是一样，分子波函数就意味着分子轨道。
It's the same thing with molecules a molecular wave function just means a molecular orbital.
在分子轨道理论中，我们基于轨道的对称性给它们命名。
So in molecular orbital theory, what we did was we named orbitals based on their symmetry.
这是反键分子轨道，我们有了成键，现在我们讨论反键。
So if we name this orbital, this is an anti-bonding molecular orbital So we had bonding and now we're talking about anti-bonding.
所以能级较低的轨道叫做成键轨道，这就是成键分子轨道。
And so this lower level is called a bonding orbital, and it is a bonding molecular orbital.
让我们把电子画在这里，我们现在有两个电子在分子轨道里。
So, let's draw in our electrons there, so we have our two electrons now in the molecular orbital.
分子轨道能量就说到这里，让我们继续来讨论一下更复杂的分子。
So, I think we have these molecular orbital energies down, so let's move on to talking about more complex molecules.
如果我们看分子轨道的话，它实际上要比，两个原子轨道都要低。
So, if we look at the molecular orbital, that's actually going to be lower in energy than either of the two atomic orbitals.
也就意味着尖端很善于绘制出分子轨道变符号的“节点”或位置。
That means the tip is particularly good at mapping out the "nodes" or places where the molecule's orbital changes sign.
所以对于电子来说，更倾向于能量更低的轨道，呆在分子轨道里。
So it's going to be favorable for the electrons instead to go to that lower energy state and be within the molecular orbital.
我将给分子轨道加上标，这个上标，表示反键轨道，有一个星号。
And I am going to superscript it molecular orbital, and this upper one, to indicate that it's antibonding, has the asterisk.
这里的这个，因为处在一个较高的能级，被叫做反键分子轨道能级。
And this one here, because it is at a higher energy is called antibonding molecular orbital.
这是sigma星，来自于1s的反键轨道，它是一个分子轨道。
This is sigma star with the antibonding orbital that came from 1s, and it is a molecular orbital.
任何时候你在分子轨道图里画轨道，你都要画出相对应的分子轨道。
So any time in a molecular orbital diagram you draw in orbitals, you need to draw the corresponding molecular orbitals.
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