让我们开始来讨论成键轨道。
同样，我们叫它成键轨道。
And this again is what we're going to call a bonding orbital.
所以成键轨道在下面。
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.
现在，也是你们书上，这是两个pz轨道,组成的成键轨道。
Now, from your book as well, this is the pz's of the two atomic orbitals forming the bonding orbital.
你们发现当你有个成键轨道的时候，相比原子轨道能量要降低。
And what you find is when you have a bonding orbital, the energy decreases compared to the atomic orbitals.
这证明了，反键轨道，比原子轨道高，成键轨道比原子轨道第。
It turns out that the antibonding orbital is a little bit higher from the atomic orbital level than the bonding orbital is lower.
另外一个要指出的事情是，反键轨道引起的能量升高，和成键轨道引起的能量降低是相同的。
And the other thing to point out is that the energy that an anti-bonding orbital is raised by, is the same amount as a bonding orbital is lowered by.
特别的，我们把它们和，分子轨道相联系起来，我们说它们可以成为，成键轨道或者反键轨道。
So specifically, what we do associate them instead is within molecular orbitals, and what we say is that they can be either in bonding or anti-bonding orbitals.
你们要记住，任何时候我们组合两个2s轨道，我们会发现,如果我们把它们相长叠加，我们会得到一个成键轨道。
So you should remember that any time we combine 2 s orbitals, what we're going to find is if we constructively interfere those two orbitals, we're going to form a bonding orbital.
你们要记住，任何时候我们组合两个2s轨道，我们会发现,如果我们把它们相长叠加，我们会得到一个成键轨道。
So you should remember that any time we combine 2 s orbitals, what we're going to find is if we constructively interfere those two orbitals, we're going to form a bonding orbital.
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